|SMITHSONITE MINERAL FACTS|
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Smithsonite Mineral Facts:
Chemical Formula: ZnCO3: Zinc Carbonate. 64.8% Zinc Oxide by weight
Colors: May be some shade of green, yellow, blue pink, white or colorless. Streak is white.
4.0 to 4.5
Luster:. Vitreous luster.
Optics: (Refractive Index): w = 1.850; e = 1.623
Smithsonite is rarely well crystallized. It often appears as druses, botryoidal and stalactitic masses, as granular aggregates and as a friable earth. Smithsonite usually contains iron and manganese carbonates, often small quantities of calcium and magnesium carbonates (pink varieties) and sometimes traces of cadmium (yellow varieties).
Identification and Diagnostics
Localities and Origins:
Localities. The mineral is found at Nerchinsk, Siberia; Bleiberg, in Carinthia; Altenberg, Aachen; Province of Santander, Spain; at Mendip Hills (Somersetshire), Matlock (Derbyshire), Alston Moor (Cumberland), Lead Hills (Scotland), and other places in England; at Donegal, in Ireland. and in many lead and zinc mining centers.
In the US at Lancaster, Penn.; at Dubuque, Iowa; in Lawrence and Marion Counties,Arkansas; and in the lead districts of Wisconsin and Missouri.The Wisconsin and Missouri localities are the most important ones in North America.Smithsonite forms pseudomorphs after sphalerite and calcite and is pseudomorphed by quartz, limonite, calamine and goethite. Found at times in translucent green or greenish blue material which is available for ornamental uses. Such smithsonite is found at Laurium, Greece, and at Kelly, New Mexico. Smithsonite is a minor ore of zinc; commercially. Named in honor of James Smithson (1754-1829), who also founded the Smithsonian Institution at Washington.
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Please note that the author, Chris Ralph, retains all copyrights to this entire document and it may not be reproduced, quoted or copied without permission.
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