The brilliant cut best displays sphalerite's high dispersion of 0.156 (three times as high as for diamond). Known by a variety of chemical-based names subsequent to Agricola and before Glocker, including "zincum".Approved, 'Grandfathered' (first described prior to 1959)Yellow, light to dark brown, black, red-brown, colourless, light blue.

recovered as profitable by-products when they are abundant enough.

Sphalerite is an important zinc ore that is exploited industrially. Although it is too fragile for jewelry, rating only a 3.5 to 4.0 on the hardness scale, sphalerite is a magnificent stone The Canadian Mineralogist: 15: 303-308.Schaefer, S.C. (1978) Electrochemical determination of the Gibbs energy of formation of sphalerite (ZnS).

Sphalerite is also found in veins and contact metamorphic deposits Its most commonly silver and grey, but can also be seen as red, black, yellow, brown, green, and colorless. Miners have also been known to refer to sphalerite as zinc blende, black-jack and ruby jack. Pure sphalerite is nearly colorless, but it is commonly brown, yellow, black, or dark red because of impurities. Recent top producers include Australia, Bolivia, Canada, China, India, Ireland, Kazakhstan, Mexico, Peru, and the United States. This is a scale that shows how hard a mineral is. adamantine luster. the finest crystallized examples can be given. "Zincblende" redirects here. Geology: 31: 913-916.Lusk, J., Calder, B.O.E. Darker, more opaquevarieties contain more iron. It does have however both a very high refractive index and an extremely high dispersion, making this gem an extraordinary piece for gem collections. The iron content is normally less than 25% by weight. Zinc sulfate is used in dyeing and in medicine. American Mineralogist: 60: 466-470.Fleet, M.E. You’ll find no shortage of facetable sphalerite rough in most colors. (1977) The birefringence-structural state relation in natural zinc sulfides and its application to the schalenblende from Pribram. Around 95% of all primary zinc is extracted from sphaleritic ores.

American Mineralogist: 40: 658-675.Rigault G. (1956) Gallio e Indio nella blenda. It can have excellent luster and associates with many beautifully colored minerals making it one of the best enhancers of many fine mineral specimens.

Quarry) are highly fluorescent orange and / or blue in long wave ultraviolet Gem-quality material often has yellowish to honey brown, red to orange, or green colour. European Journal of Mineralogy 31, 325-333.This map shows a selection of localities that have latitude and longitude coordinates recorded.

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