Okenite
Ca10Si18O46·18H2OIMA symbol: Okegrandfathered
Okenite is a silicate mineral with the formula Ca10Si18O46·18H2O, crystallizing in the triclinic system. It has a Mohs hardness of 4.5-5, typically white, blue or yellow in color, with a pearly luster, a specific gravity of 2. Its streak is white.
Photos
Crystallography
| Crystal system | triclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P -1 |
| Cell (Å, °) | a = 9.69, b = 7.28, c = 22.02; α = 92.7, β = 100.1, γ = 110.9 |
| Cell volume | 1418.48 ų, Z = 2 |
| Axial ratios | 1.3310:1:3.0247calculated from COD 9000883 |
| Source structure | COD 9000883 (American Mineralogist, 1983) — 1 of 2 structures |
Physical properties
| Density (calculated) | 2.26 g/cm³calculated from COD 9000883 |
|---|---|
| Hardness (Mohs) | 4.5-5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 2 g/cm3single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, white, yellowsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) |
| Luster | pearlysingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 1966.57 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Ca 20.38%, Si 25.71%, O 52.07%, H 1.85% |
Classification
| Nickel-Strunz (10th) | 9.EA.40Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.EA.40Wikidata (CC0) |