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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
Similar Names
| Achromatite | A synonym of 'Achrematite' |
| Chromitite | A rock classification type |
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 for Standard |
|---|---|---|
| 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)
Ma'ale Adumim, Quds Governorate, West Bank, Palestine