Formula: Na2(Ti,Nb)2Si2O9 . nH2O
Origin of name: After locality; Murmansk, Kola Peninsula, Russia
Crystal system: Triclinic
Crystal class: -1
Twinning:
Unit cell: a = 10.54 Ǻ, b = 13.88 Ǻ, c = 11.69 Ǻ, α = 94.3˚, β = 98.6˚, γ = 89.8˚
Colour: Lilac to bright pink, silvery, yellow, brown, brownish black
Diaphaneity:
Luster: Vitreous on cleavage, greasy
Habit: Crystals euhedral, platy, in aggregates; flaky and lamellar masses
Hardness: 2 to 3
Specific gravity: 2.76 to 2.8
Cleavage: 1; {001} perfect
Tenacity:
Streak:
Synonyms/varieties:
Comments:
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