Anorthoclase
(Na,K)AlSi3O8 (3)IMA symbol: Anoother:I
Anorthoclase is a silicate mineral with the formula (Na,K)AlSi3O8 (3), crystallizing in the triclinic system. It has a calculated density of 2.58 g/cm3. Its streak is white.
Photos
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Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C -1 |
| Cell (Å, °) | a = 8.29, b = 12.966, c = 7.151; α = 91.18, β = 116.31, γ = 90.14 |
| Cell volume | 688.819 ų, Z = 4 |
| Axial ratios | 0.6394:1:0.5515calculated from COD 9000855 |
| Source structure | COD 9000855 (American Mineralogist, 1982) — 1 of 9 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.204 | 4.098 | 3.238 | 3.241 | 3.241 | 3.205 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 90.4 | 79.7 | 55.1 | 47.6 | 45.2 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9000855; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.58 g/cm³calculated from COD 9000855 |
|---|---|
| Streak | whitesingle sourceWikidata (CC0) |