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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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 |
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 - HexoctahedralH-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), |
Crystal Structure:
Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above
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Wyckoff R W G , Crystal Structures , 1 (1963) p.7-83, Second edition. Interscience Publishers, New York, New York, Cubic closest packed, ccp, structure
View Additional jPOWD Structure files for Chromium
[1]
[2]
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Physical Properties of Chromium
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Color: |
White. |
Density: |
7.2 |
Diaphaniety: |
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: |
relectron=6.65 gm/cc note: rChromium =7.20 gm/cc. |
Fermion Index |
Fermion Index = 0.095 Boson Index = 0.905 |
Photoelectric: |
PEChromium = 23.26 barns/electron U=PEChromium x relectron= 154.63 barns/cc. |
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: |
1.1.12.1 (1)Native Elements |
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(1.1)with metallic elements other than the platinum group |
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(1.1.12)Dana Group |
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1.1.12.1 Chromium Cr I m3m 4/m 3 2/m |
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1.1.12.2 Chromferide Fe3Cr1-x(x=0,6) P m3m 4/m 3 2/m |
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1.1.12.3 Ferchromide Cr3Fe1-x(x=0,6) P m3m 4/m 3 2/m |
Strunz Class: |
I/A.06-10 I - Elements |
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I/A - Metallic and intermetallic compounds, Carbides, Nitrides, Phosphides and Silicides |
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I/A.06 - Chromium series, Titanium-Chromferides |
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I/A.06-05 Titanium* Ti P 63/mmc 6/m 2/m 2/m |
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I/A.06-10 Chromium Cr I m3m 4/m 3 2/m |
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I/A.06-20 Ferchromide Cr3Fe1-x(x=0,6) P m3m 4/m 3 2/m |
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I/A.06-30 Chromferide Fe3Cr1-x(x=0,6) P 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 - Applied Mineralogy
4 -Athena
5 -Google Images
6 -Google Scholar
7 -Handbook of Mineralogy (UofA)
8 -MinDAT
9 -MinMax(Deutsch)
10 -MinMax(English)
11 -Mineralienatlas (Deutsch)
12 -QUT Mineral Atlas
13 - WWW-MINCRYST
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Chromium
Cr
Dana No: 1.1.12.1 Strunz No: I/A.06-10
Locality:
Notes:
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