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Caledonite

Named after the ancient Latin/Roman term for the Highlands of Scotland, Caledonia, which is where the first known locality lies at the Leadhills in Strathclyde (Lanarkshire). Caledonite is an uncommon mineral that occurs as a secondary mineral in oxidized copper-lead deposits. Additional localities for Caledonite include in England, Russia, Iran, the United States, Chile, Australia, and several others. Associated minerals include cerussite, anglesite, leadhillite, brochantite, linarite, azurite, and malachite. Caledonite is piezoelectric and generates a charge in response to pressure.

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

Callaghanite

Dr. Eugene Callaghan is the namesake of the mineral Callaghanite as the former Director of the New Mexico Bureau of Mines in the United States and for his work on magnesite deposits. Callaghanite is a rare mineral that is found at the type locality at the Premier Chemical mine near Gabbs, Nevada, but also has an additional USA locality in Oklahoma, as well as newer localities in Italy, Germany, and Austria. It occurs disseminated at the type locality in the contact zone of a diorite and a serpentinized dolostone.

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

Calumetite

Named after the town of Calumet in Michigan, USA which is nearby the locality where the mineral was first discovered and is also near the type locality for the mineral at the Centennial mine. Calumetite is a rare mineral with additional localities in Greece, Germany, Italy, and Austria. It occurs at the type locality “in cavities and fractures in basalt, formed by the action of chlorine-bearing connate waters on copper, [with] cuprite being regarded as an intermediate product in the alteration.” Associated minerals include tremolite, quartz, epidote, copper, cuprite, atacamite, buttgenbachite, malachite, paratacamite, and anthonyite.

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

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