Formula: K2Na(Ca,Mn)2TiSi7O19(OH)
Origin of name: combination of symbols for some of the elements in its composition (Ti, Na, K)
Crystal system: Triclinic
Crystal class: 1
Twinning:
Unit cell: a = 10.35, b = 12.17, c = 7.05, α = 91°, β = 99.333°, γ = 92.5°
Colour: Pink, pale yellow, light brown
Diaphaneity: Transparent to translucent
Luster: Vitreous on cleavage
Habit: Crystals prismatic, to several cm, in rosettes and radiating fibrous aggregates
Hardness: 6
Specific gravity: 2.85
Cleavage: 2; {010} perfect, {110} imperfect, (010) ⋀ (110) = 131.5°
Tenacity:
Streak: White
Synonyms/varieties:
Comments: Found in K-feldspar metasomatites in contact with limestone.
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