Chromatite Mineral Data

Chromatite Mineral Data

General Chromatite Information

Chemical Formula:

CaCrO4

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

Empirical Formula:

Ca(CrO₄)

IMA Status:

Approved IMA 1963

Locality:

Link to MinDat.org Location Data.

Synonym:

ICSD 30283

PDF 8-458

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Chromatite Crystallography

Axial Ratios:

a:c = 1:0.86854

Cell Dimensions:

a = 7.242, c = 6.29, Z = 4; V = 329.89 Den(Calc)= 3.14

Crystal System:

Tetragonal - Ditetragonal DipyramidalH-M Symbol (4/m 2/m 2/m) Space Group: I 4₁/amd

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.62(1), 2.68(0.55), 1.85(0.45),

Physical Properties of Chromatite

Cleavage:

None

Color:

Lemon.

Density:

3.142

Fracture:

Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).

Streak:

light yellow

Optical Properties of Chromatite

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

Optical Data:

Uniaxial (+), w=1.81-1.85, e=1.84-1.88, bire=0.0300.

Calculated Properties of Chromatite

Electron Density:

r_electron=3.06 gm/cc
note: r_Chromatite=3.14 gm/cc.

Fermion Index

Fermion Index = 0.03219
Boson Index = 0.96781

Photoelectric:

PE_Chromatite= 10.71 barns/electron
U=PE_Chromatite x r_electron= 32.75 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Chromatite is Not Radioactive

Chromatite Classification

Dana Class:

35.3.2.1 (35)Anhydrous Chromates

(35.3)where A+ XO4

(35.3.2)Dana Group

35.3.2.1 Chromatite CaCrO4 I 4₁/amd 4/m 2/m 2/m

Strunz Class:

VI/F.01-20 VI - Sulfates,Chromates,Molybdates and Tungstates

VI/F - Chromates [CrO4]2-

VI/F.01 - Tarapacaite - Crocoite series

VI/F.01-10 Tarapacaite K2CrO4 Pnam 2/m 2/m 2/m

VI/F.01-20 Chromatite CaCrO4 I 4₁/amd 4/m 2/m 2/m

VI/F.01-30 Crocoite PbCrO4 P 2₁/n 2/m

Other Chromatite Information

References:

PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

See Also:

Links to other databases for Chromatite :
1 -Am. Min. Crystal Structure Database 2 -Athena 3 - EUROmin Project 4 -Google Images 5 -Google Scholar 6 -Handbook of Mineralogy (UofA) 7 -MinDAT 8 -MinMax(Deutsch) 9 -MinMax(English) 10 -Mineralienatlas (Deutsch) 11 -QUT Mineral Atlas 12 -École des Mines de Paris

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

Chromatite

CaCrO4
Dana No: 35.3.2.1 Strunz No: VI/F.01-20
Locality:

Notes: