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Mineralpedia Details for Plancheite

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Plancheite

Plancheite

Named after a Mr. Planche who provided the original samples for study. A rare mineral, Plancheite can be found in the Congo Republic, the Democratic republic of Congo, Namibia, England, the United States, Japan, and Argentina, among a couple others, as a secondary mineral in oxidized copper deposits.  Plancheite is found associated with chrysocolla, dioptase, mamachite, conichalcite, and tenorite.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/plancheite.pdf

Formula
Cu8(Si4O11)2(OH)4┬ĚH2
Crystal System
Orthorhombic 
Crystal Habit
Fibrous, Radial, Acicular 
Luster
Adamantine - Silky 
Color
blue, greenish blue 
Streak
light blue 
Class
Orthorhombic - Dipyramidal 
Fracture
Unknown 
Hardness
5.5 
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Plancheite from Eagle Eye mine, La Paz Co., Arizona, United States

Plancheite
            from Eagle Eye mine, La Paz Co., Arizona, United States

Beautiful sky blue sprays to 1mm in vug of Chrysocola matrix.

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