Bayldonite

Formula:  PbCu3(AsO4)2(OH)2 . H2O

Origin of name:  For John Bayldon, British physician

 

Crystal system:  Monoclinic

Crystal class:  2/m

Twinning:

Unit cell: a = 14.08 Ǻ, b = 5.89 Ǻ, c = 10.15 Ǻ, β = 106.1°

 

Colour:  Yellowish green, grass-green, dark green

Diaphaneity:

Luster:  Resinous

Habit:  Massive, powdery to fine-granular; crusts and minute mammillary concretions

Hardness: 4.5

Specific gravity:  5.5

Cleavage:  None

Tenacity:

Streak:

 

Synonyms/varieties:

 

Comments:

 

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