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Named for Frederick August Ludwig Karl Wilhelm Genth, who was a German-American mineralogist who described a zinc-rich helvite that was later renamed genthelvite. It is an uncommon mineral, but widespread, and can be found in the United States, Canada, Norway, England, Scotland, Nigeria, Argentina, Greenland, Russia, and the region of Karelia. Genthelvite can fluoresce a bright green under long- and short-wave ultraviolet light and it is also phosphorescent.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/genthelvite.pdf


Named for George Herbert Payne who was the Chief of the Mineral Division at the Government Chemical Laboratories in Perth, Western Australia, Australia. Georgeite is a rare mineral found only at its type locality at Carr Boyd Rocks Ni mine in Western Australia, Australia, and at the Britannia mine in Wales. It occurs as a secondary mineral in oxidized copper-nickel sulfide deposits.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/georgeite.pdf


Named after Vasily Ivanovich Gerasimovskii, a Russian mineralogist and geochemist who discovered several new minerals from the Lovozero Massif on the Kola Peninsula in Russia. Localities for Gerasimovskite include in Greenland at the Ilimaussaq complex and in Russia in the Khibiny and Lovozero massifs. It is a secondary mineral that forms by the hydrothermal alteration of niobium-titanium minerals within ussingite-bearing pegmatites.

Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/gerasimovskite.pdf

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