Coquandite

Formula:  Sb6O8(SO4) .  H2O

Origin of name:  For H. Coquand

 

Crystal system:  Triclinic

Crystal class:  -1

Twinning:

Unit cell:

 

Colour:  Colourless

Diaphaneity:  Transparent to translucent

Luster:  Adamantine

Habit:  White powdery masses and thin crusts with stibnite, silky fibers in feathery aggregates, flexible lamellar crystals, <0.1 mm

Hardness:

Specific gravity:  5.78 

Cleavage:  None

Tenacity:

Streak:  White

 

Synonyms/varieties:

 

Comments:

 

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