Carletonite

Formula:  KNa₄Ca₄Si₈O₁₈(CO₃)₄(OH,F)  ^. H₂O

Origin of name:  For Carleton University, Ottawa, Canada

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell: a = 13.18 Ǻ, c = 16.70 Ǻ

Colour:  Pink to pale blue

Diaphaneity:

Luster: Vitreous to pearly

Habit:  Crystals rare; massive

Hardness:  4 to 4.5

Specific gravity:  2.45

Cleavage:  2; {001} perfect, {110} indistinct

Tenacity:  Conchoidal

Streak:  White

Synonyms/varieties:

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