Shkatulkalite

Formula: Na₁₀MnTi₃Nb₃(Si₂O₇)₆(OH)₂F.12H₂O

Origin of name: after locality Shkatulka pegmatite vein, Kola Peninsula, Russia

Crystal system: monoclinic

Crystal class: unknown

Twinning:

Unit cell: 

Colour: colourless, silvery white, light pink, creamy, yellowish

Diaphaneity: transparent to translucent

Luster: pearly, waxy

Habit: rectangular lamellae and tabular grains to 1 mm, mica-like aggregates to 3 cm, cryptocrystalline masses and partial pseudomorphs of vuonnemite

Hardness: 3

Specific gravity: 2.70

Cleavage: 2; {100} perfect, {001} perfect micaceous

Tenacity: 

Streak: 

Synonyms/varieties:

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