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Macfallite

Name in honor of Russell P. MacFall who was an American amateur mineralogist and author. Macfallite is a rare mineral that can be found only in the United States at the Manganese mine in Michigan which is its type locality, at the Wasaka mine in Hokkaido, Japan, and at the Cerchiara mine in Liguria, Italy.  It occurs in abundance in Michigan replacing calcite in lenses and fissures in basalt and replacing braunite in low temperature metamorphic conditions in Italy.

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

Mackayite

Named for John William Mackay who was an Irish-American Comstock Lode mining magnate who made an endowment to the School of Mines at the University of Nevada in the United States. Mackayite is a rare mineral that occurs in oxidized cold-tellurium deposits within an alteration product of tellurium. It can be found in the United States, Mexico, and Chile.

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

Macquartite

Named after the French chemist Louis Charles Henri Macquart who brought the Russian specimens of crocoite from which chromium was discovered to France. Macquartite is found in only one locality at the Mammoth-St. Anthony mine in Tiger, Arizona in the United States. It occurs on museum specimens from an oxidized lead-copper-zinc orebody.

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

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