Lonsdaleite
CIMA symbol: Lonapproved
Lonsdaleite is a native element or alloy mineral with the formula C, crystallizing in the hexagonal system. It has a calculated density of 3.585 g/cm3.
Photos
Crystallography
| Crystal system | hexagonal crystal systemWikidata (CC0) |
|---|---|
| Space group | P 63 m c |
| Cell (Å, °) | a = 2.49, b = 2.49, c = 4.144; α = 90, β = 90, γ = 120 |
| Cell volume | 22.3 ų, Z = 4 |
| Axial ratios | 1.0000:1:1.6643calculated from COD 1100004 |
| Source structure | COD 1100004 (Physical Review, Serie 3. B - Condensed Matter (18,1978-), 1992) — 1 of 4 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 2.156 | 2.072 | 1.913 | 1.163 | 1.245 | 1.494 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 55.9 | 54.1 | 42 | 40.5 | 20.6 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 1100004; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.585 g/cm³calculated from COD 1100004 |
|---|
Chemistry (calculated)
| Molecular weight | 12.01 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | C 100% |
Classification
| Nickel-Strunz (10th) | 1.CB.10bWikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 1.CB.10bWikidata (CC0) |
| Dana (8th) | 1.3.6.3Wikidata (CC0) |