Formula: Ca11 (SiO4)4 O2 S
Origin of name: For Karl Jasmund, German mineralogist
Crystal system: Tetragonal
Crystal class: -42m
Twinning:
Unit cell:
Colour: Dark brown, green-brown, brown-green
Diaphaneity:
Luster: Resinous
Habit: Crystals pseudo-isometric; irregular grains to several mm
Hardness: 5
Specific gravity: 3.03
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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