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Mineralpedia Details for Rosasite

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Rosasite

Rosasite

Named for the type locality at the Rosas mine in Sardinia, Italy. Few worldwide localities including, additionally, England, Namibia, the USA, and Mexico and can be found in small amounts in other locations. Rosasite is an uncommon mineral that forms in the secondary oxidized zone of copper-zonc deposits that have formed by zinc solutions reacting with copper minerals. Rosasite may also be of post-mine origin.

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

Formula
CuZnCO3(OH)2 
Crystal System
Monoclinic 
Crystal Habit
Spherical, Mammillary, Encrustations 
Cleavage
Perfect, Perfect, None 
Luster
Vitreous - Silky 
Color
blue green, light blue, sky blue 
Streak
light blue 
Class
Monoclinic - Prismatic 
Fracture
Splintery 
Hardness
WebMineral
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Mindat
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Rosasite from 79 mine, Gila Co., Arizona, United States

Rosasite
            from 79 mine, Gila Co., Arizona, United States

Blue spherules to 1mm on nice green rhombic crystals of Smithsonite.

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Rosasite from Silver Coin mine, Humboldt Co., Nevada, United States

Rosasite
            from Silver Coin mine, Humboldt Co., Nevada, United States

Bluish green shperoidal crystals to 0.8mm.

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Rosasite from Mina Ojuela, Mapimi, Durango, Mexico

Rosasite
            from Mina Ojuela, Mapimi, Durango, Mexico

Greenish blue spherical groups composed of acicular crystals less than 1mm associated with clear discoidal Calcite. And also 5-6mm Rosasite "balls" composed of bluish green acicular crystals.

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Rosasite from Alhambra Hills, Eureka Co., Nevada, United States

Rosasite
            from Alhambra Hills, Eureka Co., Nevada, United States

Light bluish green spherulitic crystals of Rosasite to 1mm with colorless Hemimorphite. Note: this is an undocumented locality.

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Rosasite from Christmas mine, Gila Co., Arizona, United States

Rosasite
            from Christmas mine, Gila Co., Arizona, United States

Bluish green balls of Rosasite to 2mm with good coverage. Rosasite is uncommon at Christmas.

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Rosasite from Chief mine, Empire dist., Pima Co., Arizona, United States

Rosasite
            from Chief mine, Empire dist., Pima Co., Arizona, United States

Micro blue spheroidal crystals to 0.75mm.

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