hemimorphite

hemimorphite

[hem-i-mawr-fahyt]
noun
a hydrous zinc silicate mineral, Zn 4 (OH) 2 Si 2 O 7 ⋅H 2 O, occurring in clear, colorless orthorhombic crystals; calamine: an ore of zinc.

Origin:
1865–70; hemi- morph(ic) + -ite1

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hemimorphite (ˌhɛmɪˈmɔːfaɪt)
 
n
Also called (US): calamine a white mineral consisting of hydrated zinc silicate in orthorhombic crystalline form: a common ore of zinc. Formula: Zn4Si2O7(OH)2.H2O

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Encyclopedia Britannica
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hemimorphite

one of two minerals formerly called calamine in the U.S., a white silicate mineral that is an important zinc ore. A secondary mineral formed from the alteration of sphalerite, it is a hydrated basic zinc silicate, Zn4Si2O7(OH)2H2O. It is associated with other zinc ores in veins and beds in limestone and occurs in many zinc mines throughout the world. Well-crystallized, sheaflike specimens have been found in Siberia; Romania; Sardinia; Belgium; and New Jersey and Montana in the United States. For detailed physical properties, see silicate mineral (table)

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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