Formula: (Ca,Li,K,Na)11Be24(PO4)24.38H2O
Origin of name: from pahasapa = Black Hills in Dakota language
Crystal system: cubic
Crystal class: 23
Twinning:
Unit cell:
Colour: light pink, yellow-green, colourless
Diaphaneity: transparent
Luster: vitreous
Habit: crystals well formed, 1 mm, euhedral malformed crystals to 1 mm
Hardness: about 4.5
Specific gravity: 2.28
Cleavage: none
Tenacity:
Streak:
Synonyms/varieties:
Comments: zeolite-like atomic structure
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