Tschermakite
܆Ca2(Mg3Al2)(Si6Al2)O22(OH)2IMA symbol: Tsrredefined
Tschermakite is a silicate mineral with the formula ܆Ca2(Mg3Al2)(Si6Al2)O22(OH)2, crystallizing in the monoclinic system. It has a Mohs hardness of 5.5, a calculated density of 3.139 g/cm3.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 9.8059, b = 17.9721, c = 5.3012; α = 90, β = 105.063, γ = 90 |
| Cell volume | 902.144 ų, Z = 2 |
| Axial ratios | 0.5456:1:0.2950calculated from COD 9013796 |
| Source structure | COD 9013796 (The Canadian Mineralogist, 2009) |
Powder X-ray diffraction (calculated)
| d (Å) | 2.697 | 2.545 | 3.373 | 3.109 | 2.585 | 2.928 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 70 | 66.8 | 62.2 | 53.8 | 52.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9013796; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 3.139 g/cm³calculated from COD 9013796 |
|---|---|
| Hardness (Mohs) | 5.5single sourceWikidata (CC0) |
Classification
| Nickel-Strunz (10th) | 9.DE.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.DE.10Wikidata (CC0) |