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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

Gilmarite

Named in honor of Gilbert Mari, a mineralogist at the University of Nice-Sophia Antipolis in France who collected the material that the mineral was later found in. Gilmarite is a rare mineral that occurs with other copper arsenates and copper arsenides in oxidized deposits. Localities include in France, Germany, Chile, and Hungary.

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

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