Nissonite

Nissonite is a very rare copper phosphate mineral with formula: Cu₂Mg₂(PO₄)₂(OH)₂·2H₂O. It crystallizes in the monoclinic crystal system typically as crusts, tabular crystals, and diamond-shaped crystals. The color is blue-green. It has a light green streak, a Mohs hardness of 2.5 and a specific gravity of 2.73. Cleavage is [100] distinct.

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Nissonite was discovered in 1966 and was named after W. H. Nisson. It is from Llanada copper mine, near Llanada, San Benito Co., California.

References

• Webmineral data
• Handbook of Mineralogy
• Mindat with location data