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Tavorite

Named for Dr. Elysiario Tavora, a Professor of Mineralogy at the University of Brazil in Rio de Janeiro, Brazil. Tavorite is a secondary mineral that is a result of the oxidation of phosphates in granite pegmatites and occurs in just a few localities including Brazil, Germany, Rwanda, Namibia, Morocco, and Portugal. In the United States, Tavorite can be found in a few states including here in the Black Hills of South Dakota in the Custer Mountain, Hot Shot, Bull Moose, Hesnard, ,and White Elephant mines, among others, with particularly good crystals from the Tip Top mine.

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

Teallite

Named for Jethro Justinian Harris Teall, who was the Director of the Geological Survey of Great Britian and Ireland.  This hydrothermal mineral can be found in tin veins and can be a locally important tin ore mineral in some places. Found in only a few localities worldwide, a large number of specimens that have been identified as Teallite may actually be franckeite. Teallite is a flexible mineral and may even be somewhat malleable.

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

Teineite

Named after the type locality at the Teine mine in Hokkaido, Japan. This rare secondary mineral  occurs and a producr of the ozidation of copper- bearing and tellurium-bearing sulfides in only a few localities that include Japan, Mexico, the USA, Belgium, Norway and, purportedly, Russia. 

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

Tellurite

Named after its composition as tellurium (tellur) dioxide where the name for tellurium come from the Latin for “earth,” tellus. Found as an oxidation product of tellurium bearing minerals. It is found in a small number of locations including Romania, Kazakhstan, Japan, the USA, and Mexico.Crystals are acicular, straw yellow to bright golden and glassy.

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

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