General Information:
Chemical Formula:BeAlSiO4(OH)
Composition:(Molecular Weight = 145.08 gm)Beryllium 6.21 %
BeAluminum 18.60 %
AlSilicon 19.36 %
SiHydrogen 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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