Chromatite
A valid IMA mineral species
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About Chromatite
Formula:
CaCr6+O4
Colour:
Yellow, violet
Lustre:
Dull, Earthy
Specific Gravity:
3.142 (Calculated)
Crystal System:
Tetragonal
Name:
Named by F. J. Eckhardt and W. Heimbach in 1963 for the chemical composition.
Type Locality:
Earthy yellow coatings.
Isotypic with zircon and xenotime.
Compare 'UM2011-01-CrO:CaH' - a dihydrate counterpart; and the compositionally similar 'Unnamed (Calcium Chromium Oxide Postspinel)'. Also chemically similar to ellinaite.
Isotypic with zircon and xenotime.
Compare 'UM2011-01-CrO:CaH' - a dihydrate counterpart; and the compositionally similar 'Unnamed (Calcium Chromium Oxide Postspinel)'. Also chemically similar to ellinaite.
Unique Identifiers
Mindat ID:
1030
Long-form identifier:
mindat:1:1:1030:2
GUID
(UUID V4):
(UUID V4):
dfedf6b0-a130-4c84-bf7d-f5f609bce207
IMA Classification of Chromatite
Approved
Classification of Chromatite
7.FA.10
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
A : Without additional anions
7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
A : Without additional anions
Dana 7th ed.:
35.3.2.1
35.3.2.1
35 : ANHYDROUS CHROMATES
3 : AXO4
35 : ANHYDROUS CHROMATES
3 : AXO4
27.2.3
27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
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 |
---|---|---|
Crm | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Pronunciation of Chromatite
Pronunciation:
Play | Recorded by | Country |
---|---|---|
Jolyon Ralph | United Kingdom |
Physical Properties of Chromatite
Dull, Earthy
Transparency:
Translucent
Comment:
Low luster reported because of the powdery occurrence
Colour:
Yellow, violet
Comment:
Violet crystals (Mo-, Pb-bearing) from Bleiberg, Austria.
Streak:
Yellow
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.142 g/cm3 (Calculated)
Optical Data of Chromatite
Type:
Uniaxial (+)
RI values:
nω = 1.810 - 1.850 nε = 1.840 - 1.880
Max Birefringence:
δ = 0.030
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
Very High
Chemistry of Chromatite
Mindat Formula:
CaCr6+O4
Elements listed:
Crystallography of Chromatite
Crystal System:
Tetragonal
Class (H-M):
4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:
I41/amd
Cell Parameters:
a = 7.242 Å, c = 6.290 Å
Ratio:
a:c = 1 : 0.869
Unit Cell V:
329.89 ų (Calculated from Unit Cell)
Morphology:
Observed as earthy coating at type locality
Crystal Structure
Load
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
Unit Cell | Unit Cell Packed
2x2x2 | 3x3x3 | 4x4x4
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Console Off | On | Grey | Yellow
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
---|---|---|---|---|---|---|---|
0017660 | Chromatite | Clouse J (1932) Investigations on the X-Ray Crystal Structures of Ca Cr O4, Ca Cr O4 * H2 O and Ca Cr O4 * (H2 O)2 _cod_database_code 1010939 Zeitschrift fur Kristallographie 83 161-171 | 1932 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
d-spacing | Intensity |
---|---|
3.62 Å | (100) |
2.88 Å | (20) |
2.68 Å | (50) |
2.56 Å | (10) |
2.38 Å | (20) |
1.85 Å | (40) |
1.81 Å | (20) |
1.50 Å | (10) |
Comments:
8-458 synthetic
Geological Environment
Paragenetic Mode(s):
Paragenetic Mode | Earliest Age (Ga) |
---|---|
High-𝑇 alteration and/or metamorphism | |
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12]) | |
Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
Type Occurrence of Chromatite
General Appearance of Type Material:
Earthy coatings
Geological Setting of Type Material:
In sedimentary rock units at the type location.
Associated Minerals at Type Locality:
Other Language Names for Chromatite
Related Minerals - Strunz-mindat Grouping
7.FA.05 | Tarapacáite | K2(CrO4) |
7.FA.15 | Hashemite | BaCr6+O4 |
7.FA.20 | Crocoite | PbCr6+O4 |
Other Information
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 Chromatite
mindat.org URL:
https://www.mindat.org/min-1030.html
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References for Chromatite
Reference List:
Localities for Chromatite
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).
Struck out - Mineral was erroneously reported from this locality.
Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Austria | |
| Puttner (1997) |
Israel | |
| Shulamit Gross (1977) |
Jordan | |
| Sokol +9 other references |
Middle East | |
Gross (1977) | |
Norway | |
| Piilonen et al. (2012) +1 other reference |
Palestine | |
| Sokol et al. (2011) |
| Naturwiss. (1963) +1 other reference |
Russia | |
| Kozlov et al. (2011) |
South Africa | |
| McDonald et al. (1995) +1 other reference |
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Ma'ale Adumim, Quds Governorate, West Bank, Palestine