Sanidine
K(AlSi3O8)IMA symbol: Sagrandfathered
Sanidine is a silicate mineral with the formula K(AlSi3O8), crystallizing in the monoclinic system. It has a Mohs hardness of 6, a calculated density of 2.566 g/cm3. Its streak is white.
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Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | C 1 2/m 1 |
| Cell (Å, °) | a = 8.5497, b = 13.0216, c = 7.1843; α = 90, β = 115.988, γ = 90 |
| Cell volume | 718.959 ų, Z = 4 |
| Axial ratios | 0.6566:1:0.5517calculated from COD 9017213 |
| Source structure | COD 9017213 (European Journal of Mineralogy, 2013) — 1 of 47 structures |
Powder X-ray diffraction (calculated)
| d (Å) | 3.309 | 3.229 | 3.779 | 4.211 | 3.279 | 2.993 |
|---|---|---|---|---|---|---|
| I/I₀ | 100 | 78.8 | 77 | 59.2 | 59 | 58.1 |
xrd-v1: CuKa1 1.5406A, 2theta 5-90, top10, Imax=100, no DW/PO. Computed from COD 9017213; idealized occupancies, no preferred orientation.
Physical properties
| Density (calculated) | 2.566 g/cm³calculated from COD 9017213 |
|---|---|
| Hardness (Mohs) | 6single sourceWikidata (CC0) |
| Streak | whitesingle sourceWikidata (CC0) |
Chemistry (calculated)
| Molecular weight | 278.33 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | K 14.05%, Al 9.69%, Si 30.27%, O 45.99% |
Classification
| Nickel-Strunz (10th) | 9.FA.30Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.FA.30Wikidata (CC0) |
| Dana (8th) | 76.1.1.2Wikidata (CC0) |