Coffinite

Formula:  U(SiO4)1-x(OH)4x

Origin of name:  For Reuben Coffin, American geologist

 

Crystal system:  Tetragonal

Crystal class:  4/m 2/m 2/m

Twinning:

Unit cell:

 

Colour:  Black

Diaphaneity:

Luster:  Dull to adamantine

Habit:  Aggregates of fine particles; botryoidal masses

Hardness:  5 to 6

Specific gravity:  5.1

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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