Chamosite
(Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8IMA symbol: Chmgrandfathered
Chamosite is a silicate mineral with the formula (Fe2+,Mg,Al,Fe3+)6(Si,Al)4O10(OH,O)8, crystallizing in the monoclinic system. It has a Mohs hardness of 3, a calculated density of 2.946 g/cm3.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C -1 |
| Cell (Å, °) | a = 5.36982, b = 9.3031, c = 14.261; α = 90.315, β = 97.234, γ = 90.022 |
| Cell volume | 706.74 ų, Z = 2 |
| Axial ratios | 0.5772:1:1.5329calculated from COD 9009233 |
| Source structure | COD 9009233 (Clays and Clay Minerals, 1992) |
Powder X-ray diffraction (calculated)
| d (Å) | 7.074 | 14.147 | 3.537 | 4.716 | 2.015 | 2.607 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 62.4 | 56.5 | 24.7 | 16.6 | 15.8 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9009233; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.946 g/cm³calculated from COD 9009233 |
|---|---|
| Hardness (Mohs) | 3single sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 9.EC.55Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.EC.55Wikidata (CC0) |
| Dana (8th) | 71.4.1.7Wikidata (CC0) |