Clarkeite

Formula:  (Na,Ca,Pb)2U2(O,OH)7

Origin of name:  For Frank Clarke, American geochemist

 

Crystal system:  Unknown

Crystal class:  Unknown

Twinning:

Unit cell:

 

Colour:  Dark brown to chocolate brown, brownish yellow

Diaphaneity:  Translucent

Luster:  Waxy

Habit:  Massive, microcrystalline

Hardness:  4 to 4.5

Specific gravity:  6.29 to 6.39

Cleavage:  None

Tenacity:

Streak:  Yellowish brown

 

Synonyms/varieties:

 

Comments:

 

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