Cesstibtantite

Formula:  (Cs,Na)SbTa4O12

Origin of name:  From cesium, antimony (stibium) and tantalum

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Colourless to grey, black

Diaphaneity:  Opaque

Luster:  Adamantine

Habit:  Granular

Hardness:

Specific gravity:  6.4 to 6.6

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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