Diamond
CIMA symbol: Diagrandfathered
Diamond is a native element or alloy mineral with the formula C, crystallizing in the cubic system. It has a Mohs hardness of 10, the maximum of the scale, typically colorless, white, black or blue in color, with an adamantine or dull luster, a specific gravity of 3.516-3.525. Its streak is white.
Photos
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Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63/m m c |
| Cell (Å, °) | a = 2.52, b = 2.52, c = 4.12; α = 90, β = 90, γ = 120 |
| Cell volume | 22.658 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.6349calculated from COD 9012242 |
| Source structure | COD 9012242 (Journal of Solid State Chemistry, 1999) — 1 of 30 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.182 | 2.06 | 1.929 | 1.26 | 1.162 | 1.498 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 52.6 | 52.5 | 40.2 | 39.7 | 20.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9012242; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.521 g/cm³calculated from COD 9012242 |
|---|---|
| Hardness (Mohs) | 10single sourceWikidata (CC0) 10single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.516-3.525 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | black, blue, brown, colorless, green, orange, red, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | adamantine, dull, greasysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 12.01 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | C 100% |
Classification
| Nickel-Strunz (10th) | 1.CB.10aWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 1.CB.10aWikidata (CC0) |
| Dana (8th) | 1.3.6.1Wikidata (CC0) |