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Getchellite

Named for the type locality at the Getchell mine in Humboldt County in Nevada, USA. Getchellite forms at its type locality “in an epthermal gold deposit formed in a narrow, steeply-dipping fault zone cutting interbedded, [presumably] Paleozoic shales, argillites, and limestones near a granodiorite intrusive.” Localities include in Iran, Russia, Kyrgyzstan, Japan, and newer localities in Pakistan, France, China, and Azerbaijan.

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

Gilalite

Named for the type locality in the Christmas mine in Gila County, Arizona in the United States. Gilalite is a rare mineral that can only be found in Arizona and Nevada in the USA, in Greece at Laurion, and in Brazil. At its type locality, Gilalite is “a retrograde metamorphic or megogene mineral formed at the expense of a prograde calc-silicate and sulfide assemblage, in tactites commonly incrusting fractures, [and] also filling cracks or interstices in diopside grains.”

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

Gillespite

Named after Frank Gillespie of Alaska, USA who discovered the first specimen. Gillespite is a rare mineral that occues in glacial moraines and from contact metamorphic zones in localities in Alaska and California in the USA, in Yukon Territory, Canada, and in Baja California, Mexico. Associated minerals include celsian, hedenbergite, quartz, sanbornite, diopside, tourmaline, pyrrhotite, pellyite, taramellite, fresnoite, muirite, and baryte.

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

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