Cryolithionite

Formula:  Na3Li3Al2F12

Origin of name:  from composition, Lithium and cryolite

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Colourless, white

Diaphaneity:  Transparent

Luster:  Vitreous

Habit:  Crystals dodecahedral

Hardness:  2.5 to 3

Specific gravity: 2.77

Cleavage:  1; {110}distinct

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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