Formula: (K,Na)9Al9Si23O24 . 10H2O
Origin of name: After locality; Monte Somma, volcano ancestral to Vesuvius, Italy
Crystal system: Orthorhombic
Crystal class: mm2
Twinning:
Unit cell:
Colour: Colourless
Diaphaneity: Transparent
Luster: Vitreous
Habit: Dipyramidal euhedral crystals to 0.1 mm
Hardness:
Specific gravity: 2.34
Cleavage: None
Tenacity:
Streak: White
Synonyms/varieties:
Comments:
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