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Chromatite

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Formula:
Ca[CrO4]
System:
Tetragonal
Colour:
Yellow
Name:
Named by F. J. Eckhardt and W. Heimbach in 1963 for the chemical composition.
Earthy yellow coatings.

Classification of Chromatite

Approved
7.FA.10

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
27.2.3

27 : Sulphites, Chromates, Molybdates and Tungstates
2 : Chromates
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Type Occurrence of Chromatite

General Appearance of Type Material:
Earthy coatings
Year of Discovery:
1963
Geological Setting of Type Material:
In sedimentary rock units at the type location.
Associated Minerals at Type Locality:

Physical Properties of Chromatite

Dull, Earthy
Diaphaneity (Transparency):
Translucent
Comment:
Low luster reported because of the powdery occurrence
Colour:
Yellow
Streak:
Yellow
Cleavage:
None Observed
Fracture:
Conchoidal
Density:
3.142 g/cm3 (Calculated)

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 = 7.242Å, c = 6.290Å
Ratio:
a:c = 1 : 0.869
Unit Cell Volume:
V 329.89 ų (Calculated from Unit Cell)
Morphology:
Observed as earthy coating at type locality
X-Ray Powder Diffraction Data:
d-spacingIntensity
3.62 (100)
2.88 (20)
2.68 (50)
2.56 (10)
2.38 (20)
1.85 (40)
1.81 (20)
1.50 (10)
Comments:
8-458 synthetic

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.
Surface Relief:
Very High

Chemical Properties of Chromatite

Formula:
Ca[CrO4]
Essential elements:
All elements listed in formula:

Relationship of Chromatite to other Species

27.2.1TarapacáiteK2[CrO4]
27.2.2LópeziteK2[Cr2O7]
27.2.4HashemiteBa(Cr,S)O4
27.2.5CrocoitePb(CrO4)
27.2.6PhoenicochroitePb2(CrO4)O
27.2.7SantanaitePb11(CrO4)O12
27.2.8IranitePb10Cu(CrO4)6(SiO4)2(OH)2
27.2.9HemihedritePb10Zn(CrO4)6(SiO4)2(F,OH)2

Other Names for Chromatite

Name in Other Languages:
German:Chromatit
Spanish:Cromatita

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.

References for Chromatite

Reference List:
Zeitschrift für Kristallographie: 83: 1612-171.

American Mineralogist: 49: 438.

Zeitschrift für Naturforschung: B51: 751-753.

Internet Links for Chromatite

Localities for Chromatite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Austria
 
  • Carinthia
    • Gailtaler Alpen & Karnische Alpen
      • Bleiberg District
        • Bad Bleiberg
M. Puttner: Carinthia II, 187./107.: 61-65 (1997)
Israel
 
  • Negev
Shulamit Gross (1977) The mineralogy of the Hatrurim Formation, Israel. Geol. Surv. of Israel, Bull. # 70.
Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
Norway
 
  • Telemark
    • Porsgrunn
      • Bjørkedalen
Piilonen, P.C., McDonald, A.M., Poirier, G., Rowe, R. & Larsen, A.O. (2012): The mineralogy and crystal chemistry of alkaline pegmatites in the Larvik Plutonic Complex, Oslo rift valley, Norway. Part 1. Magmatic and secondary zircon: implications for petrogenesis from trace-element geochemistry. Mineralogical Magazine. 76, 649-672; Larsen, A. O. (2013): Contributions to the mineralogy of the syenite pegmatites in the Larvik Plutonic complex. Norsk Bergverksmuseum Skrifter. 50, 101-109
Palestine (TL)
 
  • West Bank
    • Hatrurim formation
Naturwiss.(1963) 50, 612
Ella V. Sokol, Olga L. Gaskova, Svetlana N. Kokh, Olga A. Kozmenko, Yuri V. Seryotkin, Yevgeny Vapnik, and Michail N. Murashko (2011): Chromatite and its Cr3+- and Cr6+-bearing precursor minerals from the Nabi Musa Mottled Zone complex, Judean Desert. American Mineralogist, 96, 659-674.
South Africa
 
  • Limpopo Province
    • Bushveld Complex
http://www.fc.up.pt/geo/ecrofi/377.PDF
Mineral and/or Locality  
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