Euclase
BeAlSiO4(OH)IMA symbol: Ecsgrandfathered
Euclase is a silicate mineral with the formula BeAlSiO4(OH), crystallizing in the monoclinic system. It has a Mohs hardness of 7.5, typically colorless, white, blue or green in color, with a pearly or vitreous luster, a specific gravity of 3.103. Its streak is red.
Photos
Crystallography
| Crystal system | monoclinic crystal systemWikidata (CC0) |
|---|---|
| Space group | P 1 21/a 1 |
| Cell (Å, °) | a = 4.763, b = 14.29, c = 4.618; α = 90, β = 100.25, γ = 90 |
| Cell volume | 309.3 ų, Z = 4 |
| Axial ratios | 0.3333:1:0.3232calculated from COD 9008079 |
| Source structure | COD 9008079 (Zeitschrift fur Kristallographie, 1962) — 1 of 7 structures |
Physical properties
| Density (calculated) | 3.094 g/cm³calculated from COD 9008079 |
|---|---|
| Hardness (Mohs) | 7.5single sourceDana, System of Mineralogy, 6th ed. (1892) |
| Specific gravity | 3.103 g/cm3corroboratedDana, System of Mineralogy, 6th ed. (1892) |
| Color | blue, colorless, green, whitesingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Streak | whitesingle sourceWikidata (CC0) redsingle sourceDana, System of Mineralogy, 6th ed. (1892) |
| Luster | pearly, vitreoussingle sourceDana, System of Mineralogy, 6th ed. (1892) |
Chemistry (calculated)
| Molecular weight | 145.08 g/molcalculated from the IMA formula |
|---|---|
| Composition (wt%) | Be 6.21%, Al 18.6%, Si 19.36%, O 55.14%, H 0.69% |
Classification
| Nickel-Strunz (10th) | 9.AE.10Wikidata (CC0) |
|---|---|
| Nickel-Strunz (9th) | 9.AE.10Wikidata (CC0) |