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Hemimorphite, is a sorosilicate mineral which has been mined from days of old from the upper parts of zinc and lead ores, chiefly associated with smithsonite. It was often assumed to be the same mineral and both were classed under the same name of calamine. In the second half of the 18th century it was discovered that there were two different minerals under the heading of calamine - a zinc carbonate and a zinc silicate, which often closely resembled each other.
Zn4Si2O7(OH)2H2O -
Hydrated Zinc Silicate Hydroxide
Class
Subclass:
Colorless, white, yellowish, greenish
White
Vitreous to dull
Transparent to translucent
3.4
4.5 - 5
Perfect
Uneven
Tabular crystals and their combinations, botryoidal and radial aggregates, granular, massive
Non-fluorescent
Frequency:
Uncommon
Origin:
Secondary in the oxidation zone of zinc deposits, associated with sphalerite, smithsonite, cerussite

Occurence:
Bisbee, Arizona, USA; El Potasi mine, Santa Eulia, Chihuahua, Mexico; Cho-Diem, Vietnam
Application:
Minor ore of zinc and as a mineral specimen.

 
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