Formula: (Sr,Ca)Al2Si2O8
Origin of name: for Chester Slawson, American mineralogist
Crystal system: monoclinic
Crystal class: 2/m
Twinning:
Unit cell:
Colour: colourless
Diaphaneity:
Luster:
Habit: tabular crystals to 7 cm in radial aggregates
Hardness: 5.5 to 6
Specific gravity: 3.12
Cleavage: 2; {010} good, {100} fair to good
Tenacity:
Streak: white
Synonyms/varieties:
Comments: specimens from Sarusaka fluoresces intense pinkish purple-red under SW ultraviolet light
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