Libethenite

Formula:  Cu2(PO4)(OH)

Origin of name:  Locality; Libethen, Hungary, now called Lubietova, Slovakia

 

Crystal system:  Orthorhombic

Crystal class:  2/m 2/m 2/m

Twinning: 

Unit cell: a = 8.063 Å, b = 8.398 Å, b = 5.887 Å

 

Colour:  Light to dark green, blackish green, light to dark olive-green

Diaphaneity: 

Luster:  Vitreous

Habit:  Crystals equant, short prismatic, acicular or blade-shaped; isolated or as crusts

Hardness:  4

Specific gravity:  3.97

Cleavage:  2; {100} and {010} indistinct

Tenacity:  Conchoidal to uneven

Streak: 

 

Synonyms/varieties:

 

Comments: 

 

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