General Information:
Chemical Formula:
K2Ca4Al2Be4Si24O60·(H2O)
Composition:
(Molecular Weight = 1,980.55 gm)
Potassium 3.95 % K
Calcium 8.09 % Ca
Beryllium 1.82 % Be
Aluminum 2.72 % Al
Silicon 34.03 % Si
Hydrogen 0.10 % H
Oxygen 49.28 % O
Empirical Formula:
K2Ca4Al2Be4(Si24O60)·(H2O)
Environment:
Granitic pegmatites.
Locality:
Val Milar, Switzerland.
Name Origin:
Named after its locality.
Physical Properties:
Cleavage:
[0001] Imperfect, [1120] Imperfect
Color:
colorless, white, greenish white, or yellowish white.
Density:
2.52
Diaphaniety:
Transparent to translucent
Habits:
Granular - Generally occurs as anhedral to subhedral crystals in matrix., Crystalline - Coarse - Occurs as well-formed coarse sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Hardness:
6 - Orthoclase
Luminescence:
Fluorescent.
Luster:
Vitreous (Glassy)
Streak:
white
More details...