Cobaltaustinite

Formula:  Ca(Co,Cu)(AsO4)(OH)

Origin of name:  From cobalt and austinite

 

Crystal system:  Monoclinic

Crystal class:  222

Twinning:

Unit cell:

 

Colour:  Green

Diaphaneity:

Luster:

Habit:  Crystallites to 25µm forming coatings

Hardness:  4.5

Specific gravity:

Cleavage:  None

Tenacity:

Streak:  Pale green

 

Synonyms/varieties:

 

Comments:  Series with conichalcite; soluble in HCl and HNO3

 

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