Formula: Ca2Al2SiO7.8H2O
Origin of name: for W. Strätling, German mineral chemist
Crystal system: hexagonal
Crystal class: -3 2/m
Twinning:
Unit cell:
Colour: colourless to light green
Diaphaneity:
Luster:
Habit: plates 0.1 to 0.5 mm
Hardness:
Specific gravity: 1.9
Cleavage: 1; {0001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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