General Information:
Chemical Formula:
(Na,K,Ca)2-3Al3(Al,Si)2Si13O36·12(H2O)
Composition:
(Molecular Weight = 1,364.31 gm)
Potassium 2.01 % K
Sodium 2.36 % Na
Calcium 0.88 % Ca
Aluminum 8.90 % Al
Silicon 27.79 % Si
Hydrogen 1.77 % H
Oxygen 56.29 % O
Empirical Formula:
Na1.4K0.7Ca0.3Al4.5Si13.5O36·12(H2O)
Environment:
Most commonly formed as a devitrification product of silicic volcanic glass from tuffs. Also occurs in cavities in rhyolites, andesites, and basalts.
Locality:
Common world wide.
Name Origin:
From the Greek klino - "oblique" ptylon - "feather" and lithos - "stone.."
Physical Properties:
Cleavage:
[010] Perfect
Color:
colorless, white, or red.
Density:
2.1 - 2.2, Average = 2.15
Habits:
Tabular - Form dimensions are thin in one direction., Crystalline - Fine - Occurs as well-formed fine sized crystals.,
Hardness:
3.5-4 - Copper Penny-Flourite
Luster:
Vitreous (Glassy)
Streak:
white
More details...