Formula: (K,Na)Ca2Si3O8(F,OH)
Origin of name: For Alexander Denisov, Russian geologist
Crystal system: Monoclinic
Crystal class: Unknown
Twinning:
Unit cell:
Colour: Gray with greenish tint
Diaphaneity:
Luster: Pearly
Habit: Acicular in parallel columnar aggregates to 15 cm across
Hardness: 4 to 5
Specific gravity: 2.76
Cleavage: 1; Perpendicular to elongation
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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