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Mineralpedia Details for Parnauite

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Parnauite

Parnauite

Named after John L. Parnau, an American mineral collector who helped contribute to the study of Parnauites type locality at Majuba Hill in Nevada, USA. Parnauite is a rare mineral that occurs in the United States, France, Germany, Slovakia, Ireland, England, Wales, and Namibia among just a couple others. It is a secondary mineral that occurs in oxidized, hydrothermal copper-tin deposits.

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

Formula
Cu9(AsO4)2(SO4)(OH)10ยท7H2
Crystal System
Orthorhombic 
Crystal Habit
Rosette, Scaly, Encrustations 
Cleavage
Good, None, None 
Color
blue green, green, light blue 
Streak
greenish white 
Class
Orthorhombic - Disphenoidal 
Hardness
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Parnauite from Majuba Hill mine, Pershing Co., Nevada, United States

Parnauite
            from Majuba Hill mine, Pershing Co., Nevada, United States

Dark green, flattened prismatic crystals in semi-parallel to somewhat radial growth forming rosettes or balls to 0.75mm. Note the terminations are oblong - or distorted squares. 

Deep, dark green ball-like aggregates to 2mm composed of thin, platy crystals.

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