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Rittmannite

Named after Alfred Rittmann, a German petrologist, volcanologist and a professor at the University of Catania in Catania, Italy. This rare mineral can be found at its type locality of Mangualde, Portugal in phosphate nodules in pegmatite veins. Two other purported localities of Rittmannite are the USA and Germany. Rittmannite is found in association with kryzhanovskite, frondelite, hureaulite, and orthoclase.

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

Rockbridgeite

Named for its type locality in Rockbridge Co., Virginia, USA. Rockbridgeite is a widespread and sometimes locally abundant in localities including several localities in the United States like right here in the Black Hills at the Tip Top, Bull Moose, and Etta mines in South Dakota, Brazil, Argentina, Portugal, France, Germany, Australia, Namibia, Zimbabwe, and Morocco. Rockbridgeite can be found in limonites from iron deposits and also as a product of the alteration of phosphates in granite pegmatites.

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

Rodalquilarite

Rare mineral named for its first noted occurrence and type locality at Rodalquilar in Andalusia, Spain. Rodalquilarite is a secondary mineral that forms in oxidized zones of tellurium rich deposits of precious metals. Found in only three places worldwide, additionally including Chile and the United States.

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

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