Chemical Formula |
Be3Al2SiO6 |
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Composition |
Beryllium aluminum silicate |
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Color |
Green to emerald-green |
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Streak |
Colorless |
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Hardness |
7.5 - 8 |
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Crystal System |
Hexagonal |
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3D Crystal Atlas |
|
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Crystal Forms |
Emerald often crystallizes in perfect, six-sided hexagons. Crystals are usually as individual prismatichexagons. Less commonly in short, stubby crystals and crystal plates. The bases of Beryl crystals are usually flat; pyramidal terminations are very rare. Also occurs in columnar aggregates and in massive. Occasionally in drusy or platy aggregates and as bundles of thin, long crystals. Crystals may be striatedlengthwise. |
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Transparency |
Transparent to opaque |
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Specific Gravity |
2.6 - 2.9 |
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Luster |
Vitreous |
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Cleavage |
3,1 - basal |
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Fracture |
Uneven to conchoidal |
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Tenacity |
Brittle |
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In Group |
Silicates; Cyclosilicates |
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Striking Features |
Emerald green color and hexagonal crystal habit. |
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Environment |
In granite pegmatites and in metamorphosed mica schists. |
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Rock Type |
Igneous, Metamorphic |
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Popularity (1-4) |
1 |
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Prevalence (1-3) |
3 |
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Demand (1-3) |
1 |
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