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Pseudobrookite Group

A group of related mineral species

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Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

Pseudobrookite

Emmelberg, Üdersdorf, Daun, Vulkaneifel, Rhineland-Palatinate, Germany

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About Pseudobrookite GroupHide

This page provides mineralogical data about Pseudobrookite Group.

Unique IdentifiersHide

Mindat ID:

55975

Long-form identifier:

mindat:1:1:55975:1

IMA Classification of Pseudobrookite GroupHide

IMA status notes:

IMA Approved Group Name

Approval history:

The Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (IMA-CNMNC) has approved a proposal (IMA 25-A) to validate ferropseudobrookite as a mineral species, to revise the definition of armalcolite following IMA recommendations, and to establish the pseudobrookite group.

Classification of Pseudobrookite GroupHide

Strunz-mindat (2026):

4.CB.15

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
C : Metal: Oxygen = 2: 3,3: 5, and similar
B : With medium-sized cations

Chemical AnalysisHide

Oxide wt%:

	1
TiO₂	44.41 %
Al₂O₃	55.13 %
FeO	0.47 %
MgO	0.37 %
Total	100.38 %
Total:	200.76 %

Empirical formulas:

Sample ID	Empirical Formula
1	(Al_1.97Mg_0.02Fe_0.01)Ti_1.01O₅

Sample references:

ID	Locality	Reference	Notes
1	Mount Carmel, Kishon Mid Reach zone 2, Kishon river, Haifa District, Israel	Ma, Chi, Cámara, Fernando, Toledo, Vered, Bindi, Luca (2023) Griffinite, Al2TiO5: A New Oxide Mineral from Inclusions in Corundum Xenocrysts from the Mount Carmel Area, Israel. Crystals, 13 (10). 1427 doi:10.3390/cryst13101427	average of eight electron probe (EPMA) microanalyses

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	Pressure (GPa)	Temp (K)
0009836	Armalcolite	Wechsler B A, Von Dreele R B (1989) Structure refinements of Mg2TiO4, MgTiO3 and MgTi2O5 by time-of-flight neutron powder diffraction Acta Crystallographica B45 542-549	1989	synthetic	0	293
0009835	Armalcolite	Wechsler B A, Von Dreele R B (1989) Structure refinements of Mg2TiO4, MgTiO3 and MgTi2O5 by time-of-flight neutron powder diffraction Acta Crystallographica B45 542-549	1989	synthetic	0	293
0000593	Armalcolite	Wechsler B A (1977) Cation distribution and high-temperature crystal chemistry of armalcolite American Mineralogist 62 913-920	1977		0	297
0000591	Armalcolite	Wechsler B A (1977) Cation distribution and high-temperature crystal chemistry of armalcolite American Mineralogist 62 913-920	1977		0	297
0000590	Armalcolite	Wechsler B A (1977) Cation distribution and high-temperature crystal chemistry of armalcolite American Mineralogist 62 913-920	1977		0	297
0002080	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		0	293
0002073	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		0	293
0018179	Pseudobrookite	Pauling L (1930) The crystal structure of pseudobrookite _cod_database_code 1011342 Zeitschrift fur Kristallographie 73 97-113	1930		0	293
0000594	Armalcolite	Wechsler B A (1977) Cation distribution and high-temperature crystal chemistry of armalcolite American Mineralogist 62 913-920	1977		0	673
0000592	Armalcolite	Wechsler B A (1977) Cation distribution and high-temperature crystal chemistry of armalcolite American Mineralogist 62 913-920	1977		0	1373
0002081	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		1.03	293
0002074	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		1.03	293
0002082	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		2.16	293
0002075	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		2.16	293
0002083	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		3.22	293
0002076	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		3.22	293
0002084	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		4.34	293
0002077	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		4.34	293
0002085	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		6.2	293
0002078	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		6.2	293
0002086	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		7.51	293
0002079	Pseudobrookite	Yang H, Hazen R M (1999) Comparative high-pressure crystal chemistry of karrooite, MgTi2O5, with different ordering states American Mineralogist 84 130-137	1999		7.51	293

CIF Raw Data - click here to close

data_global
_chemical_name_mineral 'Armalcolite'
loop_
_publ_author_name
'Wechsler B A'
'Von Dreele R B'
_journal_name_full 'Acta Crystallographica, Section B'
_journal_volume 45 
_journal_year 1989
_journal_page_first 542
_journal_page_last 549
_publ_section_title
;
 Structure refinements of Mg2TiO4, MgTiO3 and MgTi2O5 by time-of-flight neutron
 powder diffraction
 Sample: T = 1773
;
_database_code_amcsd 0009836
_chemical_compound_source 'Synthetic'
_chemical_formula_sum '(Mg Ti2) O5'
_cell_length_a 9.7492
_cell_length_b 9.9896
_cell_length_c 3.7460
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 364.825
_exptl_crystal_density_diffrn      3.642
_symmetry_space_group_name_H-M 'B b m m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,y,1/2+z'
  '-x,1/2+y,z'
  '1/2-x,1/2+y,1/2+z'
  'x,1/2-y,-z'
  '1/2+x,1/2-y,1/2-z'
  'x,y,-z'
  '1/2+x,y,1/2-z'
  '-x,-y,z'
  '1/2-x,-y,1/2+z'
  'x,1/2-y,z'
  '1/2+x,1/2-y,1/2+z'
  '-x,1/2+y,-z'
  '1/2-x,1/2+y,1/2-z'
  '-x,-y,-z'
  '1/2-x,-y,1/2-z'
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
MgM1   0.19482   0.25000   0.00000   0.60000   0.00600
TiM1   0.19482   0.25000   0.00000   0.40000   0.00600
MgM2   0.13298   0.56108   0.00000   0.20000   0.00320
TiM2   0.13298   0.56108   0.00000   0.80000   0.00320
O1   0.77021   0.25000   0.00000   1.00000   0.01120
O2   0.04653   0.11521   0.00000   1.00000   0.01050
O3   0.31235   0.06803   0.00000   1.00000   0.00870