Pollucite
Cs(Si2Al)O6·nH2OIMA symbol: Polapproved
Pollucite is a silicate mineral with the formula Cs(Si2Al)O6·nH2O, crystallizing in the cubic system. It has a Mohs hardness of 6.5, typically colorless in color, with a dull or vitreous luster, a specific gravity of 2.901. Its streak is white.
Photos
Crystallography
| Crystal system | cubic crystal systemWikidata (CC0) |
|---|---|
| Space group | I a -3 d |
| Cell (Å, °) | a = 13.74, b = 13.74, c = 13.74; α = 90, β = 90, γ = 90 |
| Cell volume | 2593.9 ų, Z = 16 |
| Axial ratios | 1.0000:1:1.0000calculated from COD 1011122 |
| Source structure | COD 1011122 (Zeitschrift für Kristallographie - Crystalline Materials, 1938) — 1 of 5 structures |
Physical properties
| Density (calculated) | 3.196 g/cm³calculated from COD 1011122 |
|---|---|
| Hardness (Mohs) | 6.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2.901 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | colorlesssingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | dull, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Classification
| Nickel-Strunz (10th) | 9.GB.05Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.GB.05Wikidata (CC0) |