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Named after the type locality at the McAlpine mine in California, USA. A rare mineral that occurs from the alteration of tellurides and tellurium-rich deposits. Additional localities for Mcalpineite include additional US localities, Italy, and Japan. Mcalpineite occurs in association with quartz, chromian muscovite, choloalite, keystoneite, mimetite, malachite, azurite, annabergites, pyrite, acanthite, hessite, electrum, altaite, silver, galena, pyrargyrite, sphalerite, owyheeite, xocomecatlite, jensenite, hinsdalite-svanbergite, and goethite.

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

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