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Rosasite



Rosasite

Blue velvety mass lining a cavity
General
CategoryMineral
Chemical formula(Cu,Zn)2(CO3)(OH)2
Identification
ColorBlue, bluish green, green
Crystal habitRadiating fibrous; botryoidal; mammillary; encrustations
Crystal systemMonoclinic-prismatic
CleavagePerfect in one direction
FractureSplintery, fibrous
Mohs Scale hardness4
LusterSilky, vitreous to dull
Refractive index1.672-1.83
StreakLight blue or green
Specific gravity4-4.2
SolubilityEffervesces in cold, dilute hydrochloric acid
Major varieties
Nickeloan rosasiteDark green

Rosasite is a carbonate mineral with minor potential for use as a zinc and copper ore. Chemically, it is a copper zinc carbonate hydroxide with a copper to zinc ratio of 3:2, occurring in the secondary oxidation zone of copper-zinc deposits. It was originally discovered in 1908 in the Rosas mine in Sardinia, Italy, and is named after the location. Fibrous blue-green rosasite crystals are usually found in globular aggregates, often associated with red limonite and other colourful minerals. It is very similar to aurichalcite, but can be distinguished by its superior hardness.

References

  • MinDAT
  • Webmineral
  • Mineral galleries
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Rosasite". A list of authors is available in Wikipedia.
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