Formula: Ca5H2Si6O18.6H2O
Origin of name: after locality Plombieres, France
Crystal system: orthorhombic
Crystal class: 2 2 2
Twinning:
Unit cell: a = 11.24, b = 28, c = 7.3
Colour: White
Diaphaneity: Translucent
Luster:
Habit: Massive, compact
Hardness: 4
Specific gravity: 2.02
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Phosphorescent and fluorescent
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