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Beryl (/ˈbɛrəl/ BERR-əl) is a mineral composed of beryllium aluminium silicate with the chemical formula Be3Al2(SiO3)6. Well-known varieties of beryl include emerald and aquamarine. Naturally occurring hexagonal crystals of beryl can be up to several meters in size, but terminated crystals are relatively rare. Pure beryl is colorless, but it is…
Deposits, Varieties & Etymology
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emerald aquamarine found emeralds red color also beryllium crystal blue yellow mineral morganite varieties rare green hexagonal golden used pink
| Subject | Predicate | Object | Confidence | Src |
|---|---|---|---|---|
| Beryl | Birefringence | δ = 0.0040–0.0070 | 1.00 | infobox |
| Beryl | Category | Cyclosilicate | 1.00 | infobox |
| Beryl | Cleavage | Imperfect on {0001} | 1.00 | infobox |
| Beryl | Color | Green, blue, yellow, colorless, pink, and others | 1.00 | infobox |
| Beryl | Crystal class | Dihexagonal dipyramidal (6/mmm) H-M symbol: (6/m 2/m 2/m) | 1.00 | infobox |
| Beryl | Crystal habit | Prismatic to tabular crystals; radial, columnar; granular to compact massive | 1.00 | infobox |
| Beryl | Crystal system | Hexagonal | 1.00 | infobox |
| Beryl | Diaphaneity | Transparent to translucent | 1.00 | infobox |
| Beryl | Formula | .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:l… | 1.00 | infobox |
| Beryl | Formula mass | 537.50 g/mol | 1.00 | infobox |
| Beryl | Fracture | Conchoidal to irregular | 1.00 | infobox |
| Beryl | IMA symbol | Brl | 1.00 | infobox |
| Beryl | Luster | Vitreous to resinous | 1.00 | infobox |
| Beryl | Mohs scale hardness | 7.5–8.0 | 1.00 | infobox |
| Beryl | Optical properties | Uniaxial (−) | 1.00 | infobox |
| Beryl | Pleochroism | Weak to distinct | 1.00 | infobox |
| Beryl | References | : 112 | 1.00 | infobox |
| Beryl | Refractive index | nω = 1.564–1.595 nε = 1.568–1.602 | 1.00 | infobox |
| Beryl | Space group | P6/mcc | 1.00 | infobox |
| Beryl | Specific gravity | 2.63–2.92 | 1.00 | infobox |
| Beryl | Streak | White | 1.00 | infobox |
| Beryl | Strunz classification | 9.CJ.05 | 1.00 | infobox |
| Beryl | Tenacity | Brittle | 1.00 | infobox |
| Beryl | Twinning | Rare | 1.00 | infobox |
| Beryl | Ultraviolet fluorescence | None (some fracture-filling materials used to improve emerald's clarity do fluoresce, but the stone itself does not). Morganite has weak violet fluorescence. | 1.00 | infobox |
| Beryl | Unit cell | a = 9.21 Å, c = 9.19 Å; Z = 2 | 1.00 | infobox |
| Beryl | is a | flawless 2 | 0.90 | text |
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