General Information:
Chemical Formula:
KAlSiO4
Composition:
(Molecular Weight = 158.16 gm)
Potassium 24.72 % K
Aluminum 17.06 % Al
Silicon 17.76 % Si
Oxygen 40.46 % O
Empirical Formula:
KAlSiO4
Locality:
Ejecta from Mte. Somma, Vesuvius.
Physical Properties:
Cleavage:
[0001] Perfect
Color:
colorless.
Density:
2.49 - 2.67, Average = 2.58
Diaphaniety:
Transparent to translucent
Habits:
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., Acicular - Occurs as needle-like crystals.,
Hardness:
5.5-6 - Knife Blade-Orthoclase
Luster:
Vitreous - Greasy
Streak:
white
More details...