Dreyerite

Formula:   BiVO4

Origin of name:   For G. Dreyer

 

Crystal system:   Tetragonal

Crystal class:   4/m 2/m 2/m

Twinning:

Unit cell: 

 

Colour:   Orange-yellow to brownish-yellow

Diaphaneity:

Luster:   Adamantine

Habit:   Tiny plates

Hardness:   2 to 3

Specific gravity:   6.25

Cleavage:   None

Tenacity: 

Streak:   Yellow

 

Synonyms/varieties:

 

Comments:   Trimorphous with clinobisvanite and pucherite

 

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