Petersite-(Y)

Formula: (Y,Ce,Nd,Ca)Cu6(PO4)3(OH)6.3H2O

Origin of name: for T. and J. Peters, American mineral curators

 

Crystal system: hexagonal

Crystal class: 6 or 6/m

Twinning: 

Unit cell: 

 

Colour: yellow-green

Diaphaneity: 

Luster: vitreous

Habit: crystals prismatic, hexagonal, less than 0.1 mm in radiating clusters and sprays

Hardness

Specific gravity: 3.41

Cleavage: none

Tenacity: 

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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