General Information:
Chemical Formula:
CaAl2Si3O10·3(H2O)
Composition:
(Molecular Weight = 392.34 gm)
Calcium 10.22 % Ca
Aluminum 13.75 % Al
Silicon 21.48 % Si
Hydrogen 1.54 % H
Oxygen 53.01 % O
Empirical Formula:
CaAl2Si3O10·3(H2O)
Environment:
Low tempurature alteration of basalts and related rocks.
IMA Status:
Approved IMA
Locality:
Kaiserstuhl in Baden.
Name Origin:
From the Greek, skolec = 'worm' in reference to the mineral's reaction to the blowpipe flame.
Physical Properties:
Cleavage:
[110] Perfect
Color:
brownish, colorless, or white.
Density:
2.16 - 2.4, Average = 2.28
Diaphaniety:
Transparent to subtranslucent
Habits:
Massive - Fibrous - Distinctly fibrous fine-grained forms., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite),
Hardness:
5-5.5 - Apatite-Knife Blade
Luminescence:
Non-fluorescent.
Luster:
Vitreous - Silky
Streak:
white
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