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Chromatite

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Ma'aleh Adumim, Hatrurim formation, West Bank, Palestine

Show Chromatite Photos (2)
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'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 {I41/a 2/m 2/d}
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)
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
]
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
[O|CrO
 
4
]
27.2.7Santanaite
Pb
 
11
[O
 
12
|CrO
 
4
]
27.2.8Iranite
Pb
 
10
Cu[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]
27.2.9Hemihedrite
Pb
 
10
Zn[(F,OH)
 
2
|(CrO
 
4
)
 
6
|(SiO
 
4
)
 
2
]

Other Names for Chromatite

Other Languages:
German:Chromatit
Spanish:Chromatita

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

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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  • Chromatite details from Handbook of Mineralogy (PDF)
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    Localities for Chromatite

    Hide Locality List
    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 Mts
        • Bleiberg District
          • Bad Bleiberg
    		M. Puttner: Carinthia II, 187./107.: 61-65 (1997)
    Israel
     
    • Negev desert
    		Gross, S. (1977): The Mineralogy of the Hatrurim Formation, Israel. Geological Survey of Israel, Bulletin no. 70, 80 pp.
    Shulamit Gross (1977) The mineralogy of the Hatrurim Formation, Israel. Geol. Surv. of Israel, Bull. # 70.
    Palestine
     
    • West Bank
      • Hatrurim formation
    		Naturwiss.(1963) 50, 612
    South Africa
     
    • Limpopo Province
      • Bushveld Complex
    		http://www.fc.up.pt/geo/ecrofi/377.PDF
    Mineral and/or Locality
    Google
     
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