Formula: Ca6Si2O7(OH)6
Origin of name: For Howard Jaffe, American geologist
Crystal system: Hexagonal
Crystal class: 3
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Euhedral to subhedral elongated crystals wit hexagonal cross section average 0.25 x 0.4 mm
Hardness:
Specific gravity: 2.65
Cleavage: 1; {100} imperfect
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Soluble in HCl
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