Calamine (mineral)
Calamine is a historic name for an ore of zinc. The name calamine was derived from lapis calaminaris, a Latin corruption of Greek cadmia (καδμία), the old name for zinc ores in general. The name of the Belgian town of Kelmis, La Calamine in French, which was home to a zinc mine, comes from this. In the 18th and 19th centuries large ore mines could be found near the German village of Breinigerberg.
During the early 19th century it was discovered that what had been thought to be one ore was actually two distinct minerals:
- Zinc carbonate ZnCO3 or smithsonite and
- Zinc silicate Zn4Si2O7(OH)2·H2O or hemimorphite.
Although chemically and crystallographically quite distinct, the two minerals exhibit similar massive or botryoidal external form[1][2] and are not readily distinguished without detailed chemical or physical analysis. The first person to separate the minerals was the British chemist and mineralogist James Smithson in 1803.[3] In the mining industry the term calamine has been historically used to refer to both minerals indiscriminately.
In mineralogy calamine is no longer considered a valid term. It has been replaced by smithsonite and hemimorphite in order to distinguish it from the pinkish mixture of zinc oxide (ZnO) and iron(III) oxide (Fe2O3) used in calamine lotion.
Early history
[edit]In the 16th century demand for latten (brass) in England came from the needs of wool-carding, for which brass-wire combs were preferred, and battery pieces (brassware formed by hammering sheet brass in a battery mill).[4][5]: 207–209 The only known method for producing the alloy was by heating copper and calamine together in the cementation process and in 1568 a royal charter was granted to the Society of the Mineral and Battery Works to search for the mineral and produce brass, to reduce dependence on imported metal from Germany. Factories to exploit the process were established at Isleworth and Rotherhithe.[5] By the late 17th century enough was known of metallic zinc to make brass solder directly by combining copper and spelter (zinc ingots). In 1738 a patent was granted to William Champion, a Bristol brass founder, for the large-scale reduction of calamine to produce spelter.[5]
In 1684 a paper presented to the Royal Society described the medicinal and veterinary properties of the compound when in finely powdered form.[5]: 219–221 Since then no mechanism of action for the powder has been identified, and as of 1992[update] the only medical effect of the powdered mineral appears to be its ability to absorb moisture secreted from irritated and weeping skin.[6]
References
[edit]
- ^ Hemimorphite on Webmineral
- ^ Smithsonite on Webmineral
- ^ Goode, George Brown (1897). The Smithsonian Institution, 1846-1896, The History of Its First Half Century. Washington, D.C.: De Vinne Press. pp. 12–13.
- ^ Pollard, A. Mark; Heron, Carl (2008). Archaeological chemistry (2 ed.). Cambridge: Royal Society of Chemistry. p. 203. ISBN 978-0-85404-262-3.
- ^ a b c d Gough, John Weidhofft (1930). The Mines of Mendip. Oxford University Press. OCLC 163035417.
- ^ David Edward Marcinko (1992). Medical and Surgical Therapeutics of the Foot and Ankle. William & Wilkins. p. 134. ISBN 978-0-683-05549-8.