General Information:
Chemical Formula:
BeAlSiO4(OH)
Composition:
(Molecular Weight = 145.08 gm)
Beryllium 6.21 % Be
Aluminum 18.60 % Al
Silicon 19.36 % Si
Hydrogen 0.69 % H
Oxygen 55.14 % O
Empirical Formula:
BeAl(SiO4)(OH)
Environment:
Hydrothermal, pegmatitic, and alluvial rocks.
Locality:
Orenburg district in the southern Urals, Russia.
Name Origin:
From the Greek eu - "well" and klasis - "breaking."
Physical Properties:
Cleavage:
[010] Perfect
Color:
blue, colorless, white, light blue, or light green.
Density:
2.987 - 3.1, Average = 3.04
Diaphaniety:
Transparent to translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Massive - Fibrous - Distinctly fibrous fine-grained forms., Striated - Parallel lines on crystal surface or cleavag e face.
Hardness:
7.5 - Garnet
Luminescence:
Non-fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
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