Mineralogy Database

Chromatite Mineral Data

Search Webmineral :

General Chromatite Information

Help on Chemical  Formula: Chemical Formula: CaCrO4
Help on Composition: Composition: Molecular Weight = 156.07 gm
   Calcium   25.68 %  Ca   35.93 % CaO
   Chromium  33.32 %  Cr   64.07 % CrO3
   Oxygen    41.01 %  O
            ______        ______ 
            100.00 %      100.00 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca(CrO4)
Help on Environment: Environment: Formed in an arid climate along fractures in limestones and marls by ascending ground water, the chromium derived from underlying bituminous phosphatic marls.
Help on IMA Status: IMA Status: Approved IMA 1963
Help on Locality: Locality: Maaleh Adumim, along the Jerusalem-Jericho highway, and in the Hatrurim Formation, Israel. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named as a chromate.
Help on Synonym: Synonym: ICSD 30283
  PDF 8-458

Chromatite Image

Click Here for Larger   Image in a New Browser Window Images:
Click Here for Larger   Image


Comments: Yellow, powdery coating of chromatite over carbonate rock. Associated minerals in the crust are halite and fluorapatite.
Location: Ma'aleh Adumim, Hatrurim formation, West Bank, Palestine. Scale: Box Size 29x29 mm.
© Pavel M. Kartashov

Chromatite Crystallography

Help on Axial Ratios: Axial Ratios: a:c = 1:0.86854
Help on Cell Dimensions: Cell Dimensions: a = 7.242, c = 6.29, Z = 4; V = 329.89 Den(Calc)= 3.14
Help on Crystal System: Crystal System: Tetragonal - Ditetragonal Dipyramidal H-M Symbol (4/m 2/m 2/m) Space Group: I 41/amd
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 3.62(1), 2.68(0.55), 1.85(0.45),

Physical Properties of Chromatite

Help on Cleavage: Cleavage: None
Help on Color: Color: Lemon.
Help on Density: Density: 3.142
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Streak: Streak: light yellow

Optical Properties of Chromatite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.073 (Fair) - where the CI = (1-KPDmeas/KC)
CI calc= 0.072 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2691,KPDmeas= 0.2689,KC= 0.2901
Ncalc = 1.91
Help on Optical Data: Optical Data: Uniaxial (+), w=1.81-1.85, e=1.84-1.88, bire=0.0300.

Calculated Properties of Chromatite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.06 gm/cc
note: Specific Gravity of Chromatite =3.14 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.03
Boson Index = 0.97
Help on Photoelectric: Photoelectric: PEChromatite = 10.71 barns/electron
U=PEChromatite x rElectron Density= 32.75 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chromatite is Not Radioactive

Chromatite Classification

Help on  Dana Class: Dana Class: (35)Anhydrous Chromates
  (35.03)where A+ XO4
  (35.03.02)Dana Group Chromatite CaCrO4 I 41/amd 4/m 2/m 2/m
Help on  Strunz Class: Strunz Class: 07.FA.10 07 - SULFATES (SELENATES, TELLURATES)
  07.F - Chromates
  07.FA -Without additional anions
07.FA.10 Chromatite CaCrO4 I 41/amd 4/m 2/m 2/m

Other Chromatite Information

Help on References: References: NAME( AntBidBlaNic5) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Chromatite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

Search for Chromatite using:

Web webmineral.com
[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Chromatite :

Ask about Chromatite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Espaņol

Print or Cut-and-Paste your Chromatite Specimen Label here :


Dana No: Strunz No: 07.FA.10





Dakota Matrix
Excalibur Minerals
Exceptional Minerals
Hudson Insitute
John Betts Fine Minerals
Mc Dougall Minerals
Mineral News
Rock and Mineral Shows
Weinrich Minerals, Inc.