Leucosphenite

Formula:  BaNa₄Ti₂B₂Si₁₀O₃₀

Origin of name:  From Greek for white and wedge

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning: 

Unit cell: 

Colour:  Colourless, white, pale blue

Diaphaneity:  Transparent to translucent

Luster:  Vitreous

Habit:  Crystals tabular or wedge-shape

Hardness:  6.5

Specific gravity:  3.05 to 3.089

Cleavage:  2; {010} distinct, {001} fair

Tenacity: 

Streak:  White

Synonyms/varieties:

Comments: