Griphite

Formula:  Na4Ca6(Mn,Fe,Mg)19Li2Al8(PO4)24(F,OH)8

Origin of name:   From Greek for puzzle

 

Crystal system:  Cubic

Crystal class:  2/m -3

Twinning:

Unit cell:

 

Colour:  Dark brown to brownish black

Diaphaneity:  Translucent

Luster:  Resinous to vitreous

Habit:  Massive, compact

Hardness:  5.5

Specific gravity:  3.64

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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