Labuntsovite

Formula:  (K,Ba,Na)8(Ti,Nb)9(SiO3)16(O,OH)10 . nH2O

Origin of name:  For A. and El Labuntsov, Russian mineralogists

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: a = 14.18 Ǻ, b = 15.48 Ǻ, c = 13.70 Ǻ, β = 117°

 

Colour:  Rose to brownish yellow

Diaphaneity: 

Luster:  Greasy

Habit:  Crystals prismatic

Hardness:  ~ 6

Specific gravity:  2.90 to 2.96

Cleavage:  1; {-102}

Tenacity:  Brittle

Streak:  White

 

Synonyms/varieties:  Titanoelpidite

 

Comments: 

 

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