Bismutomicrolite

Formula:  (Bi,Ca)(Ta,Nb)2O6(OH)

Origin of name:  From bismuth and microlite

 

Crystal system:  Cubic

Crystal class:  4/m -3 2/m

Twinning:

Unit cell:

 

Colour:  Dark gray to black, yellow, pink, brown

Diaphaneity:

Luster:  Dull resinous

Habit:  Massive

Hardness:  5

Specific gravity:  6.83

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:  Bi analogue of microlite

 

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