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ZnCO3 White, yellow, gray, brown, or green secondary carbonate mineral associated with sphalerite and commonly reniform, botryoidal, stalactitic, or granular; hardness is 5 on Mohs scale, and specific gravity is 4.30-4.45; it is an ore of zinc. Also known as calamine; dry-bone ore; szaskaite; zinc spar.



(named after the British chemist and mineralogist J. Smithson, 1765-1829), a mineral of the natural carbonate group; chemical composition, ZnCO3 (ZnO, 64.9 percent; CO2, 35.1 percent). It contains as admixtures Fe, Mn, Cd, Co, Mg, and Pb. Smithsonite crystallizes in the trigonal system. The crystals, which occur rarely, are rhombohedral or scalenohe-dral. Smithsonite usually occurs as granular or earthy masses and stalactitic aggregates with a conchoidal structure. It is, among other colors, white, yellowish, gray, or brown. Its hardness on Mohs scale is 4–4.5, and its density is 4,300–4,400 kg/m3.

Smithsonite is a typical commercial mineral from the zone of oxidation of deposits of primary zinc sulfides in limestones that is formed as a result of the replacement of the limestones. Deposits are found in northern Mexico, Greece (Laurium), Poland (Olkusz), and southwestern Africa (Tsumeb). In the USSR, there are deposits in the Kazakh SSR, Uzbek SSR, and Transbaikalia. [23–1830–]

References in periodicals archive ?
Cecil Foster's latest novel, Dry Bone Memories, is greatly indebted to jazz in both its structure and content.
Describing the spiritual wasteland of dry bones, the prophet Ezekiel said, "[The Spirit] led me all around among the bones .
Lists comprise the dry bones of history and it is up to a historian to find patterns and conclusions that make the data relevant and make them come to life.
Can the South Sudanese not rise up themselves as new Ezekiel to conjure up the dry bones of South Sudan to revive them through their respective tradition?
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Detroit is No Dry Bones not only depicts the past and present but also considers the city's future.
Fear builds barriers, deafens truth, squashes love and eventually leaves dry bones in the heat of the desert.
The Dry Bones crew is mostly the Yeah Board Shop skate team and whoever else is awesome.
The vision of the Valley of Dry Bones is being realized before our eyes in these ancient communities," said Pinchas Goldschmidt, president of the Conference of European Rabbis, who attended the rededication in Voronezh.
Studies to find the average anteversion in normal population are available mainly by direct observations on dry bones.
Anthropological and archaeological studies also mostly focused on the technical aspects of measuring it in dry bones.