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Chromium Mineral Data
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General Chromium Information
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 Chemical Formula: |
Cr |
| Composition: |
Molecular Weight = 52.00 gm |
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Chromium 100.00 % Cr |
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______ |
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100.00 % |
| Empirical Formula: |
Cr |
| Environment: |
In heavy sands derived from the contact metamorphic zone between a siliceous marble and ultramafic rock. |
| IMA Status: |
Approved IMA 1981 |
| Locality: |
Sichuan Province, China. Link to MinDat.org Location Data. |
| Name Origin: |
From the Greek, chroma = "color", in allusion to the colorful salts of this element. |
| Synonym: |
ICSD 64711 |
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PDF 6-694 |
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Chromium Image |
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Images:
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Chromium Crystallography
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| Cell Dimensions: |
a = 2.8839, Z = 2; V = 23.99 Den(Calc)= 7.20 |
| Crystal System: |
Isometric - Hexoctahedral H-M Symbol (4/m 3 2/m) Space Group: I m3m |
| X Ray Diffraction: |
By Intensity(I/Io): 2.039(1), 1.177(0.3), 0.912(0.2), |
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Physical Properties of Chromium
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| Color: |
White. |
| Density: |
7.2 |
| Diaphaneity: |
Opaque |
| Fracture: |
Brittle - Generally displayed by glasses and most non-metallic minerals. |
| Hardness: |
7.5 - Garnet |
| Luster: |
Metallic |
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Optical Properties of Chromium
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| RL Color: |
White with a yellow tint. |
| Reflectivity |
Standardized Intensity (100%) Reflection Spectra of Chromium in Air
| λ |
R |
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∑ R(λ) |
| 480 nm |
65.30 |
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| 546 nm |
67.90 |
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| 589 nm |
68.80 |
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| 656 nm |
70.00 |
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Calculated Relative Intensity Colors of Chromium in Air
Relative
Intensity |
0% |
20% |
40% |
60% |
80% |
100% |
120% |
140% |
| R |
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Calculated Properties of Chromium
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| Electron Density: |
Bulk Density (Electron Density)=6.65 gm/cc
note: Specific Gravity of Chromium =7.20 gm/cc.
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| Fermion Index: |
Fermion Index = 0.09
Boson Index = 0.91 |
| Photoelectric: |
PEChromium = 23.26 barns/electron
U=PEChromium x rElectron Density= 154.63 barns/cc.
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| Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Chromium is Not Radioactive |
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Chromium Classification
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| Dana Class: |
01.01.12.01 (01)Native Elements |
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(01.01)with metallic elements other than the platinum group |
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(01.01.12)Dana Group |
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01.01.12.01 Chromium Cr I m3m 4/m 3 2/m |
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01.01.12.02 Chromferide Fe3Cr1-x(x=0,6) P m3m 4/m 3 2/m |
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01.01.12.03 Ferchromide Cr3Fe1-x(x=0,6) P m3m 4/m 3 2/m |
| Strunz Class: |
01.AE.05 01 - ELEMENTS (Metals and intermetallic alloys; metalloids and nonmetals; carbides, silicides, nitrides, phosphides) |
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01.A - Metals and Intermetallic Alloys |
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01.AE -Iron-chromium family |
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01.AE.05 Chromium Cr I m3m 4/m 3 2/m |
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01.AE.05 Kamacite? alpha-(Fe,Ni) F m3m 4/m 3 2/m |
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01.AE.05 Iron Fe I m3m 4/m 3 2/m |
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Other Chromium Information
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| References: |
NAME( AntBidBlaNic1) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic1) |
| See Also: |
Links to other databases for Chromium :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - GeoScienceWorld
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - Mineralienatlas (Deutsch)
11 - Online Mineral Museum
12 - QUT Mineral Atlas
13 - Ruff.Info
14 - WWW-MINCRYST
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Chromium
Cr
Dana No: 01.01.12.01 Strunz No: 01.AE.05
Locality:
Notes:
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