Formula: NaCa4Si8O20F.8H2O
Origin of name: from natrium = sodium and apophyllite
Crystal system: orthorhombic
Crystal class: 2/m 2/m 2/m
Twinning:
Unit cell:
Colour: colourless, brownish yellow to yellowish brown
Diaphaneity:
Luster: vitreous to pearly
Habit: crystals prisms terminated with dipyramids
Hardness: 4 to 5
Specific gravity: 2.50
Cleavage: 2; {001} perfect, {110} poor
Tenacity:
Streak: light gray
Synonyms/varieties:
Comments:
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