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Chromite

A valid IMA mineral species - grandfathered

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Photos of Chromite (89)Discuss Chromite

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Chromite

Serpentinite quarries, Dietmannsdorf an der Wild, Brunn an der Wild, Horn District, Lower Austria, Austria

Chromite

Deglazines, Mostuéjouls, Millau, Aveyron, Occitanie, France

Chromite, etc.

Moran Mine, Kambalda Nickel mines, Kambalda, Coolgardie Shire, Western Australia, Australia

Chromite

Serpentinite quarries, Dietmannsdorf an der Wild, Brunn an der Wild, Horn District, Lower Austria, Austria

Chromite

Deglazines, Mostuéjouls, Millau, Aveyron, Occitanie, France

Chromite, etc.

Moran Mine, Kambalda Nickel mines, Kambalda, Coolgardie Shire, Western Australia, Australia

Chromite

Serpentinite quarries, Dietmannsdorf an der Wild, Brunn an der Wild, Horn District, Lower Austria, Austria

Chromite

Deglazines, Mostuéjouls, Millau, Aveyron, Occitanie, France

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About ChromiteHide

Formula:

Fe²⁺Cr³⁺₂O₄

Colour:

Black

Lustre:

Resinous, Greasy, Metallic, Sub-Metallic, Dull

Hardness:

5½

Specific Gravity:

4.5 - 4.8

Crystal System:

Isometric

Member of:

Spinel Subgroup > Oxyspinel Group > Spinel Supergroup

Name:

Chromite was named in 1845 by Wilhelm Haidinger in allusion to its composition. The species was originally named fer chromate alumine by Louis Nicolas Vauquelin in 1798. Vauquelin was the discoverer of the element chromium.

Type Locality:

ⓘ Carrade de Cavalaire, Cavalaire-sur-Mer, Draguignan, Var, Provence-Alpes-Côte d'Azur, France

Polymorph of:

Chenmingite, Xieite

Isostructural with:

Magnesiochromite, Magnetite

Chromite is the most important chromium ore mineral.
It forms a complete solid solution series with many other members of the group, eg. in the Chromite-Hercynite Series, Chromite-Spinel Series, Chromite-Magnetite Series and the Chromite-Magnesiochromite Series. It is the iron analogue of Zincochromite, Cochromite, Manganochromite and Magnesiochromite and the Cr analogue of Hercynite, Coulsonite and Magnetite

It usually contains Mg, ferric iron [Fe(III)], Al and often trace amounts of Ti. "Ferritchromite", i.e. Fe(III) substitutions for Al and Cr, usually in grain rims, may give high total Fe contents and a false chromite identification. Of course, the definition requires dominant Fe(II)>Mg and Cr>Fe(III). (e.g. photo ID: 514894).

"Chromite" is commonly used for any Cr-rich mineral of the spinel group, particularly for the chromite-magnesiochromite series, and much of the mineral referred to as "chromite" in geological and petrological papers and mining statistics is magnesiochromite. The Fe-dominant species - chromite itself - can be FOUND, although uncommonly, in many "chromite" deposits, chromitite (rock name), and other "chromite"-bearing occurrences connected with hyperbasic rocks. As a rule of thumb, a member of the chromite-magnesiochromite series is twice as likely to be a magnesiochromite instead of a chromite. "Chromites" associated with olivine or serpentines, which are Mg-rich rocks, frequently have Mg-rich associated minerals. True chromite is common as inclusions in diamonds from kimberlites (South Africa and Yakutia). Members of the spinel group may be enriched Cr and V in marbles (Slyudyanka), massive sulphide ores (Outokumpu) and also in some types of meteorites. In any case, "chromite" always needs ANALYTICAL CONFIRMATION.
Note: Chromite, that is near end-member, has a higher specific gravity than near end-member magnesiochromite.

Unique IdentifiersHide

Mindat ID:

1036

Long-form identifier:

mindat:1:1:1036:4

IMA Classification of ChromiteHide

IMA status:

Approved, 'Grandfathered' (first described prior to 1959)

First published:

1845

Classification of ChromiteHide

Strunz-mindat (2026):

4.BB.05

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
B : Metal: Oxygen = 3:4 and similar
B : With only medium-sized cations

Dana 8th ed.:

7.2.3.3

7 : MULTIPLE OXIDES
2 : AB₂X₄

Hey's CIM Ref.:

7.14.12

7 : Oxides and Hydroxides
14 : Oxides of Cr

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Please only use the official IMA–CNMNC symbol. Older variants are listed for historical use only.

Symbol	Source	Reference for Standard
Chr	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43
Chr	Kretz (1983)	Kretz, R. (1983) Symbols of rock-forming minerals. American Mineralogist, 68, 277–279.
Chr	Siivolam & Schmid (2007)	Siivolam, J. and Schmid, R. (2007) Recommendations by the IUGS Subcommission on the Systematics of Metamorphic Rocks: List of mineral abbreviations. Web-version 01.02.07. IUGS Commission on the Systematics in Petrology. download
Chr	Whitney & Evans (2010)	Whitney, D.L. and Evans, B.W. (2010) Abbreviations for names of rock-forming minerals. American Mineralogist, 95, 185–187 doi:10.2138/am.2010.3371
Chr	The Canadian Mineralogist (2019)	The Canadian Mineralogist (2019) The Canadian Mineralogist list of symbols for rock- and ore-forming minerals (December 30, 2019). download

Pronunciation of ChromiteHide

Pronunciation:

Play	Recorded by	Country
	Jolyon Ralph	United Kingdom

Physical Properties of ChromiteHide

Lustre:

Resinous, Greasy, Metallic, Sub-Metallic, Dull

Transparency:

Translucent, Opaque

Colour:

Black

Streak:

Brown

Hardness:

5½ on Mohs scale

Hardness:

VHN₁₀₀=1278 - 1456 kg/mm² - Vickers

Tenacity:

Brittle

Cleavage:

None Observed

Parting:

Parting may develop along {111}

Fracture:

Irregular/Uneven, Hackly, Sub-Conchoidal

Comment:

Broken surfaces frequently have an angular granulated appearance.

Density:

4.5 - 4.8 g/cm³ (Measured) 5.12 g/cm³ (Calculated)

Optical Data of ChromiteHide

Type:

Isotropic

RI values:

n = 2.08 - 2.16

Birefringence:

0.0

Surface Relief:

Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).

This shows the grain boundary and Becke line effect under plane-polarised light, based on the contrast between this mineral's average refractive index and the mounting medium. It does not take into account mineral colouration.

Focus:

In focus

Reflectivity:

Wavelength	R₁ (%)
400nm	13.2%
420nm	13.1%
440nm	13.0%
460nm	12.8%
480nm	12.6%
500nm	12.4%
520nm	12.2%
540nm	12.0%
560nm	11.9%
580nm	11.8%
600nm	11.7%
620nm	11.7%
640nm	11.6%
660nm	11.6%
680nm	11.6%
700nm	11.6%

Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 13.2%.

Colour in reflected light:

Grey-white with brownish tint.

Internal Reflections:

Brownish red

Pleochroism:

Non-pleochroic

Chemistry of ChromiteHide

Mindat Formula:

Fe²⁺Cr³⁺₂O₄

Element Weights:

Element	% weight
Cr	46.459 %
O	28.591 %
Fe	24.949 %

Calculated from ideal end-member formula.

Elements listed:

Cr, Fe, O - search for minerals with similar chemistry

Common Impurities:

Mg,Mn,Zn,Al,Ti

Chemical AnalysisHide

Oxide wt%:

	1
TiO₂	0.53 %
Al₂O₃	6.72 %
Cr₂O₃	50.13 %
FeO	23.29 %
Fe₂O₃	13.20 %
MnO	0.79 %
MgO	5.34 %
Total:	100 %

Sample references:

ID	Locality	Reference	Notes
1	Salem ultrabasic rocks, Tamil Nadu, India	Manjunatha Reddy, B., Janardhan, A. S. (1988) Titanoclinohumite from Ultrabasic Rocks of Salem, Tamil Nadu. Journal Geological Society of India, 31 (5). 499-503 doi:10.17491/jgsi/1988/310509	Wet chemical analysis of chromite from an ultramafic body.

Crystallography of ChromiteHide

Crystal System:

Isometric

Class (H-M):

m3m(4/m32/m) - Hexoctahedral

Space Group:

Fd3m

Setting:

Fd3m

Cell Parameters:

a = 8.344 Å

Unit Cell V:

580.93 Å³ (Calculated from Unit Cell)

Morphology:

Octahedral crystals uncommon, modified by {001} at times. Rarely, crystals may show small dodecahedral faces, etc. Usually massive, fine granular to compact.

Twinning:

On {111}

Crystallographic forms of ChromiteHide

Crystal Atlas:

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Click on an icon to view

Chromite no.1 - {111} - Goldschmidt (1913-1926)

Chromite no.2 - {110} - Goldschmidt (1913-1926)

3d models and HTML5 code kindly provided by www.smorf.nl.

Crystal StructureHide

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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure

ID	Species	Reference	Year	Locality	Temp (K)
0004967	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Internatsionalnaya mine, Malo-Botuobiya kimberlite field, Russia	293
0004966	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Mir mine, Malo-Botuobiya kimberlite field, Russia	293
0004965	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Internatsionalnaya mine, Malo-Botuobiya kimberlite field, Russia	293
0004964	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Udachnaya mine, Daldyn kimberlitic field, close to Arctic Circle, Russia	293
0004963	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Udachnaya mine, Daldyn kimberlitic field, close to Arctic Circle, Russia	293
0004962	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Udachnaya mine, Daldyn kimberlitic field, close to Arctic Circle, Russia	293
0004961	Chromite	Lenaz D, Logvinova A M, Princivalle F, Sobolev N V (2009) Structural parameters of chromite included in diamond and kimberlites from Siberia: A new tool for discriminating ultramafic source American Mineralogist 94 1067-1070	2009	Udachnaya mine, Daldyn kimberlitic field, close to Arctic Circle, Russia	293
0007245	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007244	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007243	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007242	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007241	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007240	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007239	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007238	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007237	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007236	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007235	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007234	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007233	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007232	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007231	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007230	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007229	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007228	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007227	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0007226	Chromite	Lenaz D, Braidotti R, Princivalle F, Garuti G, Zaccarini F (2007) Crystal chemistry and structural refinement of chromites from different chromitite layers and xenoliths of the Bushveld complex European Journal of Mineralogy 19 599-609	2007	Bushveld complex, South Africa	293
0006047	Chromite	Lenaz D, Princivalle F (2005) The crystal chemistry of detrital chromian spinel from the southeastern Alps and Outer Dinarides: The discrimination of supplies from areas of similar tectonic setting? The Canadian Mineralogist 43 1305-1314	2005		293
0006037	Chromite	Lenaz D, Princivalle F (2005) The crystal chemistry of detrital chromian spinel from the southeastern Alps and Outer Dinarides: The discrimination of supplies from areas of similar tectonic setting? The Canadian Mineralogist 43 1305-1314	2005		293
0006034	Chromite	Lenaz D, Princivalle F (2005) The crystal chemistry of detrital chromian spinel from the southeastern Alps and Outer Dinarides: The discrimination of supplies from areas of similar tectonic setting? The Canadian Mineralogist 43 1305-1314	2005		293
0006033	Chromite	Lenaz D, Princivalle F (2005) The crystal chemistry of detrital chromian spinel from the southeastern Alps and Outer Dinarides: The discrimination of supplies from areas of similar tectonic setting? The Canadian Mineralogist 43 1305-1314	2005		293
0008918	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008917	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008916	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008915	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008914	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008913	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293
0008912	Chromite	Lenaz D, Skogby H, Princivalle F, Halenius U (2004) Structural changes and valence states in the MgCr2O4-FeCr2O4 solid solution series Physics and Chemistry of Minerals 31 633-642	2004		293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Chromite'
loop_
_publ_author_name
'Lenaz D'
'Logvinova A M'
'Princivalle F'
'Sobolev N V'
_journal_name_full 'American Mineralogist'
_journal_volume 94 
_journal_year 2009
_journal_page_first 1067
_journal_page_last 1070
_publ_section_title
;
 Structural parameters of chromite included in diamond and kimberlites
 from Siberia: A new tool for discriminating ultramafic source
 Note: sample UV-170
;
_database_code_amcsd 0004967
_chemical_compound_source 'Internatsionalnaya mine, Malo-Botuobiya kimberlite field, Russia'
_chemical_formula_sum 'Mg.607 Al.396 Mn.008 Fe.416 Ti.002 Cr1.6 O4'
_cell_length_a 8.3055
_cell_length_b 8.3055
_cell_length_c 8.3055
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 572.924
_exptl_crystal_density_diffrn      4.554
_symmetry_space_group_name_H-M 'F d 3 m'
loop_
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  '1/2+x,+z,1/2+y'
  '-z,1/2-y,1/2-x'
  '-z,-y,-x'
  '1/2-z,1/2-y,-x'
  '1/2-z,-y,1/2-x'
  'y,1/2+x,1/2+z'
  'y,+x,+z'
  '1/2+y,1/2+x,+z'
  '1/2+y,+x,1/2+z'
  '-x,1/2-z,1/2-y'
  '-x,-z,-y'
  '1/2-x,1/2-z,-y'
  '1/2-x,-z,1/2-y'
  'z,1/2+y,1/2+x'
  'z,+y,+x'
  '1/2+z,1/2+y,+x'
  '1/2+z,+y,1/2+x'
  '-y,1/2-x,1/2-z'
  '-y,-x,-z'
  '1/2-y,1/2-x,-z'
  '1/2-y,-x,1/2-z'
  '3/4+z,1/4+x,1/2-y'
  '3/4+z,3/4+x,-y'
  '1/4+z,1/4+x,-y'
  '1/4+z,3/4+x,1/2-y'
  '3/4-y,1/4-z,1/2+x'
  '3/4-y,3/4-z,+x'
  '1/4-y,1/4-z,+x'
  '1/4-y,3/4-z,1/2+x'
  '3/4+x,1/4+y,1/2-z'
  '3/4+x,3/4+y,-z'
  '1/4+x,1/4+y,-z'
  '1/4+x,3/4+y,1/2-z'
  '3/4-z,1/4-x,1/2+y'
  '3/4-z,3/4-x,+y'
  '1/4-z,1/4-x,+y'
  '1/4-z,3/4-x,1/2+y'
  '3/4+y,1/4+z,1/2-x'
  '3/4+y,3/4+z,-x'
  '1/4+y,1/4+z,-x'
  '1/4+y,3/4+z,1/2-x'
  '3/4-x,1/4-y,1/2+z'
  '3/4-x,3/4-y,+z'
  '1/4-x,1/4-y,+z'
  '1/4-x,3/4-y,1/2+z'
  '-z,3/4+x,3/4+y'
  '-z,1/4+x,1/4+y'
  '1/2-z,3/4+x,1/4+y'
  '1/2-z,1/4+x,3/4+y'
  'y,3/4-z,3/4-x'
  'y,1/4-z,1/4-x'
  '1/2+y,3/4-z,1/4-x'
  '1/2+y,1/4-z,3/4-x'
  '-x,3/4+y,3/4+z'
  '-x,1/4+y,1/4+z'
  '1/2-x,3/4+y,1/4+z'
  '1/2-x,1/4+y,3/4+z'
  'z,3/4-x,3/4-y'
  'z,1/4-x,1/4-y'
  '1/2+z,3/4-x,1/4-y'
  '1/2+z,1/4-x,3/4-y'
  '-y,3/4+z,3/4+x'
  '-y,1/4+z,1/4+x'
  '1/2-y,3/4+z,1/4+x'
  '1/2-y,1/4+z,3/4+x'
  'x,3/4-y,3/4-z'
  'x,1/4-y,1/4-z'
  '1/2+x,3/4-y,1/4-z'
  '1/2+x,1/4-y,3/4-z'
  '1/4-x,1/2+z,3/4-y'
  '1/4-x,+z,1/4-y'
  '3/4-x,1/2+z,1/4-y'
  '3/4-x,+z,3/4-y'
  '1/4+z,1/2-y,3/4+x'
  '1/4+z,-y,1/4+x'
  '3/4+z,1/2-y,1/4+x'
  '3/4+z,-y,3/4+x'
  '1/4-y,1/2+x,3/4-z'
  '1/4-y,+x,1/4-z'
  '3/4-y,1/2+x,1/4-z'
  '3/4-y,+x,3/4-z'
  '1/4+x,1/2-z,3/4+y'
  '1/4+x,-z,1/4+y'
  '3/4+x,1/2-z,1/4+y'
  '3/4+x,-z,3/4+y'
  '1/4-z,1/2+y,3/4-x'
  '1/4-z,+y,1/4-x'
  '3/4-z,1/2+y,1/4-x'
  '3/4-z,+y,3/4-x'
  '1/4+y,1/2-x,3/4+z'
  '1/4+y,-x,1/4+z'
  '3/4+y,1/2-x,1/4+z'
  '3/4+y,-x,3/4+z'
  '3/4-x,3/4-z,y'
  '3/4-x,1/4-z,1/2+y'
  '1/4-x,3/4-z,1/2+y'
  '1/4-x,1/4-z,y'
  '3/4+z,3/4+y,-x'
  '3/4+z,1/4+y,1/2-x'
  '1/4+z,3/4+y,1/2-x'
  '1/4+z,1/4+y,-x'
  '3/4-y,3/4-x,z'
  '3/4-y,1/4-x,1/2+z'
  '1/4-y,3/4-x,1/2+z'
  '1/4-y,1/4-x,z'
  '3/4+x,3/4+z,-y'
  '3/4+x,1/4+z,1/2-y'
  '1/4+x,3/4+z,1/2-y'
  '1/4+x,1/4+z,-y'
  '3/4-z,3/4-y,x'
  '3/4-z,1/4-y,1/2+x'
  '1/4-z,3/4-y,1/2+x'
  '1/4-z,1/4-y,x'
  '3/4+y,3/4+x,-z'
  '3/4+y,1/4+x,1/2-z'
  '1/4+y,3/4+x,1/2-z'
  '1/4+y,1/4+x,-z'
  '-z,-x,-y'
  '-z,1/2-x,1/2-y'
  '1/2-z,-x,1/2-y'
  '1/2-z,1/2-x,-y'
  'y,z,x'
  'y,1/2+z,1/2+x'
  '1/2+y,z,1/2+x'
  '1/2+y,1/2+z,x'
  '-x,-y,-z'
  '-x,1/2-y,1/2-z'
  '1/2-x,-y,1/2-z'
  '1/2-x,1/2-y,-z'
  'z,x,y'
  'z,1/2+x,1/2+y'
  '1/2+z,x,1/2+y'
  '1/2+z,1/2+x,y'
  '-y,-z,-x'
  '-y,1/2-z,1/2-x'
  '1/2-y,-z,1/2-x'
  '1/2-y,1/2-z,-x'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_occupancy
_atom_site_U_iso_or_equiv
MgT   0.12500   0.12500   0.12500   0.56700   0.00520
AlT   0.12500   0.12500   0.12500   0.02200   0.00520
MnT   0.12500   0.12500   0.12500   0.00800   0.00520
Fe2+T   0.12500   0.12500   0.12500   0.40400   0.00520
MgM   0.50000   0.50000   0.50000   0.02000   0.00310
AlM   0.50000   0.50000   0.50000   0.18700   0.00310
TiM   0.50000   0.50000   0.50000   0.00100   0.00310
CrM   0.50000   0.50000   0.50000   0.80000   0.00310
Fe2+M   0.50000   0.50000   0.50000   0.00600   0.00310
O   0.26237   0.26237   0.26237   1.00000   0.00520

X-Ray Powder DiffractionHide

Powder Diffraction Data:

d-spacing	Intensity
4.84 Å	(10)
2.96 Å	(30)
2.53 Å	(100)
2.09 Å	(20)
1.61 Å	(40)
1.48 Å	(50)
1.09 Å	(10)
0.855 Å	(10)

Comments:

ICDD 34-140 (synthetic). See also GSAM 85:195 (1962) natural material.

Geological EnvironmentHide

Paragenetic Mode(s):

Paragenetic Mode	Earliest Age (Ga)
Pre-terrestrial "Ur-minerals"	>4.57
1 : Stellar atmosphere condensates
Stage 1: Primary nebular phases	4.567-4.561
4 : Primary chondrule phases	4.566–4.561
Stage 2: Planetesimal differentiation and alteration	4.566-4.550
5 : Primary asteroid phases	4.566–4.560
6 : Secondary asteroid phases	4.566-4.560
Stage 3a: Earth’s earliest Hadean crust	>4.50
7 : Ultramafic igneous rocks
8 : Mafic igneous rocks
Near-surface Processes
26 : Hadean detrital minerals
Stage 4b: Highly evolved igneous rocks	>3.0
36 : Carbonatites, kimberlites, and related igneous rocks
37 : Layered igneous intrusions and related PGE minerals
Stage 5: Initiation of plate tectonics	<3.5-2.5
38 : Ophiolites
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere	<0.6
51 : Pyrometamorphic minerals (see also #54 and #56)	<0.36