Chromdravite

Formula:  NaMg3(Cr,Fe)6(BO3)3Si6O18(OH)4

Origin of name:  From chromium and Dravite

 

Crystal system:  Hexagonal

Crystal class:  3m

Twinning:

Unit cell:

 

Colour:  Dark green  to green-black

Diaphaneity:

Luster:

Habit:  Pyramidal

Hardness:

Specific gravity:  3.40

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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