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Lazarenkoite
A valid IMA mineral species
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About Lazarenkoite
E. K. Lazarenko
Formula:
(Ca,Fe2+)Fe3+As3+3O7 · 3H2O
Colour:
Bright orange
Lustre:
Resinous, Silky
Hardness:
1
Specific Gravity:
3.45
Crystal System:
Orthorhombic
Name:
In honour of Academician Evgenii Konstantinovich Lazarenko (1912–1979), mineralogist, Lvov University, Lvov, Ukraine.
This page provides mineralogical data about Lazarenkoite.
Unique Identifiers
Mindat ID:
2354
Long-form identifier:
mindat:1:1:2354:8
IMA Classification of Lazarenkoite
Classification of Lazarenkoite
4.JC.10
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
C : Arsenites, antimonites, bismuthites; without additional anions, with H2O
4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
C : Arsenites, antimonites, bismuthites; without additional anions, with H2O
7.8.3.1
7 : MULTIPLE OXIDES
8 : AB3X7
7 : MULTIPLE OXIDES
8 : AB3X7
23.20
23 : Arsenites
23 : Arsenites
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Laz | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Lazarenkoite
Optical Data of Lazarenkoite
Type:
Biaxial (-)
RI values:
nα = 1.820(3) nβ = 1.920(3) nγ = 1.955(3)
2V:
Measured: 30° , Calculated: 58°
Birefringence:
0.135
Max. Birefringence:
δ = 0.135
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Very High (positive)
Relative to Canada balsam mounting medium (n ≈ 1.537).
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.
In focus
Interference Figure:
This shows the idealized biaxial acute bisectrix (Bxa) interference figure
- the conoscopic view for a grain cut perpendicular to the acute bisectrix, using
this mineral's 2V. The two small white dots mark the melatopes - the points
where the two optic axes emerge - and are shown only when they fall within the
field of view. The coloured bands are isochromatics, and the dark bands are
isogyres.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Rotate the stage: at 0°/90° the isogyres form a cross through the melatopes; at 45° they pull apart into curved hyperbolas. That splitting on rotation - absent in a uniaxial figure - is the standard diagnostic test for telling biaxial minerals from uniaxial ones. If 2V is large, the melatopes may fall outside the field of view, as they often do at the microscope too.
Dispersion:
small
Pleochroism:
Strong
Comments:
X = pale yellow; Y = pale brown; Z = rose-brown
Chemistry of Lazarenkoite
Mindat Formula:
(Ca,Fe2+)Fe3+As3+3O7 · 3H2O
Element Weights:
Crystallography of Lazarenkoite
Crystal System:
Orthorhombic
Cell Parameters:
a = 21.80 Å, b = 12.64 Å, c = 8.40 Å
Ratio:
a:b:c = 1.725 : 1 : 0.665
Unit Cell V:
2,314.64 ų (Calculated from Unit Cell)
Z:
10
Comment:
Orthorhombic-pseudohexagonal; point group not determined.
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 11.2 Å | (9) |
| 8.40 Å | (10) |
| 6.55 Å | (8) |
| 4.66 Å | (9) |
| 3.31 Å | (4) |
| 3.20 Å | (4) |
| 3.135 Å | (4) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 7: Great Oxidation Event | <2.4 |
| 47a : [Near-surface hydration of prior minerals] | |
| 47d : [Arsenates, antimonates, selenates, bismuthinates] |
Type Occurrence of Lazarenkoite
General Appearance of Type Material:
Fibrous incrustations.
Geological Setting of Type Material:
In oxidation zone of a cobalt-nickel ore deposit, where it is an oxidation product of skutterudite (smaltine) and löllingite.
Associated Minerals at Type Locality:
Synonyms of Lazarenkoite
Other Language Names for Lazarenkoite
Related Minerals - Strunz-mindat Grouping
Other Information
Notes:
Insoluble in water, but easily dissolved in dilute, cold HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Internet Links for Lazarenkoite
mindat.org URL:
https://www.mindat.org/min-2354.html
Please feel free to link to this page.
Please feel free to link to this page.
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External Links:
Mineral Dealers:
References for Lazarenkoite
Reference List:
Localities for Lazarenkoite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and further information on this occurrence.
? - Indicates mineral may be doubtful at this locality.
- Good crystals or important locality for species.
- World class for species or very significant.
(TL) - Type Locality for a valid mineral species.
(FRL) - First Recorded Locality for everything else (eg varieties).
All localities listed without proper references should be considered as questionable.
Germany | |
| |
Russia (TL) | |
| Pekov (1998) |
Spain | |
| Joan Abella i Creus (Joanabellacreus@gmail.com) |
Switzerland | |
| Ansermet (2012) |
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Khovu-Aksy Ni-Co deposit, Chedi-Kholsky District, Tuva, Russia