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Chromatite

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Formula:
Ca[CrO
 
4
]
System:TetragonalColour:Yellow
Name:Named by F. J. Eckhardt and W. Heimbach in 1963 for the chemical composition.


Earthy yellow coatings.

Classification of Chromatite

IMA status:Approved
Strunz 8th edition ID:6/F.01-20
Nickel-Strunz 10th (pending) edition ID:7.FA.10

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
F : Chromates
A : Without additional anions
Dana 7th edition ID:35.3.2.1
Dana 8th edition ID:35.3.2.1

35 : ANHYDROUS CHROMATES
3 : AXO4
Hey's CIM Ref.:27.2.3

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

Type Locality:Ma'ale Adumim (Ma'aleh Adumim), Hatrurim formation, West Bank, Palestine
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:
GypsumCalcite

Physical Properties of Chromatite

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

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:
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
Maximum Birefringence:δ = 0.030

Chart 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[CrO
 
4
]
Simplified for copy/paste:Ca[CrO4]
Essential elements:Ca, Cr, O
All elements listed in formula:Ca, Cr, O

Relationship of Chromatite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
7.FA.05Tarapacáite
K
 
2
[CrO
 
4
]
7.FA.15Hashemite
Ba(Cr,S)O
 
4
7.FA.20Crocoite
Pb(CrO
 
4
)
Related Minerals - Hey's Index Grouping:

- +
27.2.1Tarapacáite
K
 
2
[CrO
 
4
]
27.2.2Lópezite
K
 
2
[Cr
 
2
O
 
7
]
27.2.4Hashemite
Ba(Cr,S)O
 
4
27.2.5Crocoite
Pb(CrO
 
4
)
27.2.6Phoenicochroite
Pb
 
2
(CrO
 
4
)O
27.2.7Santanaite
Pb
 
11
(CrO
 
4
)O
 
12
27.2.8Iranite
Pb
 
10
Cu(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2
27.2.9Hemihedrite
Pb
 
10
Zn(CrO
 
4
)
 
6
(SiO
 
4
)
 
2
(F,OH)
 
2

Other Names for Chromatite

Other Languages:
German:Chromatit
Spanish:Cromatita

Other Information

Health Warning: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

Search Engines:
  • Look for Chromatite on Google
  • Look for Chromatite images on Google
  • External Links:
  • Look for Chromatite on Webmineral
  • Look for Chromatite on Athena Mineralogy
  • Look for Chromatite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chromatite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy rare minerals from Excalibur Minerals
  • Search for Chromatite on Well-Arranged Molecules
  • Buy from Dave Bunk Minerals
  • Buy from David K Joyce minerals
  • Buy from McDougall Minerals
  • DAKOTA MATRIX offers Cabinet and Rare Species from Worldwide Localities.
  • The Arkenstone - Fine Minerals
  • Fine and rare minerals from mintreasure.com
  • Top quality minerals from Kristalle of California
  • Lapis Mineral Magazin
  • rare and unusual minerals mainly crystallized
  • Localities for Chromatite

    The 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. ? 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
     
    • 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
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