General Information:
Chemical Formula:
(K,Ba)Al(Si,Al)3O8
Composition:
(Molecular Weight = 302.06 gm)
Potassium 9.71 % K
Barium 11.37 % Ba
Aluminum 15.63 % Al
Silicon 20.92 % Si
Oxygen 42.37 % O
Empirical Formula:
K0.75Ba0.25Al1.75Si2.25O8
Environment:
Magamtic and contact metamorphic.
Locality:
Imfield, Switzerland.
Name Origin:
From the Greek hyalos - "glass" and phanos - "to appear."
Physical Properties:
Cleavage:
[001] Perfect, [010] Imperfect
Color:
colorless, yellow, white, or red.
Density:
2.81
Diaphaniety:
Transparent to translucent
Habits:
Massive - Uniformly indistinguishable crystals forming large masses., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:
6-6.5 - Orthoclase-Pyrite
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
white
More details...