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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


Named in reference to the relationship to perite and for the dominance of tellurium, with lead, in the bismuth site of perite. It can be found only in California in the United States at the Bird Nest drift, the type locality, and the Aga mine, both in Otto Mountain. It occurs in fracture surfaces and in small vugs in brecciated quartz veins and in association with acanthite, bromine-rich chlorargyrite, caledonite, cerussite, galena, goethite, and linarite. Other secondary minerals occur in the veins. It appears as bluish-green, transparent rounded, square tablets and flakes.

Ref. Kampf, A. R., et al. and American Mineralogist October v. 95 no. 10 p. 1569-1573


Named for C. Tenger, the chemist from Sweden who first studied the mineral. It can be found in only a few localities including Sweden, Norway, Japan, Canada, and the USA. It occurs as “an alteration coating on yttrium-bearing minerals.”

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

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