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Category Silicate mineral
(repeating unit)
Strunz classification 9.DG.75
Crystal system Triclinic
Crystal class Pinacoidal (1)
(same H-M symbol)
Space group P1
Color Pink, Pale yellow, Light brown
Crystal habit Fibrous, crystalline or Prismatic, crystalline, or Radial, crystalline
Cleavage Perfect in one direction, indistinct in one direction
Mohs scale hardness 6
Luster Vitreous to glassy
Streak White
Diaphaneity Transparent to Translucent
Specific gravity 2.82
Density 2.82
Optical properties Biaxial (+)
Refractive index nα = 1.593 nβ = 1.621 nγ = 1.666
Birefringence δ = 0.073
References [1][2][3]

Tinaksite (K2Na(Ca,Mn2+)2Ti[O|Si7O18(OH)])[2] is a mineral found in northern Russia. Tinaksite can be grayish-white, yellowish, orange, or brown,[1] and it is often found in charoite.[4] Its name is derived from its composition: titanium (Ti), sodium (Na) potassium (K) and silicon (Si). International Mineralogical Association first recognized tinaksite as a mineral in 1965.


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