Beryllium Aluminium Silicate - Beryll
Be3Al2(SiO3)6
-3427.jpg "Beryllium Aluminium Silicate - Beryll - Be3Al2(SiO3)6")
-3438.jpg "Beryllium Aluminium Silicate - Beryll - Be3Al2(SiO3)6")
-3448.jpg "Beryllium Aluminium Silicate - Beryll - Be3Al2(SiO3)6")
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Chemical name
Beryllium Aluminium Silicate - Beryll |
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Mineral name
Beryll |
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Chemical formula
Be3Al2(SiO3)6 |
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Melting point [°C]
1410 |
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Crystal system
hexagonal |
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Crystal Class
dihexagonal-dipyramidal (6/m 2/m 2/m) |
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Space Group
P6/mcc |
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Unit cell
a [Å]:9.23 b [Å]:9.23 c [Å]:9.19 |
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Molecular weight [g/mol]
537,48 |
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Formula units
Z=2 |
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Frequent crystal surfaces
{10-10}, {0001}, {11-20} |
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Twinning
rare |
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Mohs hardness
7.5 - 8 |
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Density [g/cm3]
2.63 - 2.8 |
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Cleavage
imperfect on {0001} |
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Fracture / Tenacity
uneven to conchoidal, brittle |
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Color
blue, green, yellow, rose, red, white, colorless |
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Streak
white |
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Transparency
transparent to translucent |
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Luster
vitreous to resinous |
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Optical character
uniaxial (-) |
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Refractive Index
nω=1.564-1.595; nε=1.568-1.602 |
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Birefringence δ
0.004 - 0.007 |
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Pleochroism δ
weak to distinct |
