Search Mineralpedia – A Mineral Photo Database and Identification Guide
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
Named to honor Professor Smithson Tennant, a chemist of Oxford University at Oxford, England. Tennantite occurs in deposits metamorphosed by contact metamorphism as well as in hydrothermal veins. Found in over a thousand localities and related to tetrahedrite, but is more rare than tetrahedrite.
Ref. Handbook of Mineralogy, Anthony et al (1995) and MSA at http://www.handbookofmineralogy.org/pdfs/tennantite.pdf