Pseudomalachite

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Pseudomalachite

Description

Dark waxy green crystals composed of basic copper phosphate. Pseudomalachite occurs naturally in the oxidation zones for copper ores. It resembles Malachite in appearance but lacks the characeristic light/dark banding of malachite. Pseudomalachite has been found in Zaire (Shaba), Slovakia (Libethen), Germany (Bavaria), France, Russia, Canada and the U.S. (Arizona).

Synonyms and Related Terms

basic copper phosphate; false malachite; ehlite; lunnite; Pseudomalachit (Deut.) 

Raman

PseudomalachiteRS.jpg

FTIR

Pseudomalachite (HU Mineral Museum).PNG


Other Properties

Crystals = massive Fracture = conchoidal Clavage = imperfect Luster = glassy Streak = bluish green

Unlike malachite, pseudomalachite will not react with acids.

Composition Cu5(PO4)2(OH)4
Mohs Hardness 4.0-4.5
Density 3.6-4.34
Molecular Weight 542.68
Refractive Index 1.791; 1.856; 1.867

Additional Information

MinDat: Pseudomalachite

Sources Checked for Data in Record

  • External source or communication Comment: Naumova et al. Studies in Conservation 35:81-88, 1990