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Rhabdophane-(La)

Named for the Greek rhabdos, meaning “rod,” and phainesthai, meaning “to appear,” in reference to the bands that appear in the emission spectrum, and for its lanthanum dominance over the other rare earth elements in the species. A rare mineral found in association with clay minerals and opal, and forms as a secondary mineral in weathered sediments that are cut by faults, where the sediments are likey from prophyritic granites.

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

Rhodizite

Named after the Greek rhodizein, meaning “rose-colored” or “to be rose-colored” as its presence in a flame will turn the flame red. Rhodizite is a rare mineral found as an accessory mineral that formed late-stage in granite pegmatites. It has localities in Russia, Madagascar, England, and the United States only. Rhodizite is highly piezoelectric, produces a charge in response to pressure, and pyroelectric, produces a charge in response to heating.

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

Rhodochrosite

Named for the Greek rhodon, meaning “rose” and chrosis, meaning “coloring.” Rhodochrosite is found in low-temperature to mid-temperature hydrothermal vein deposits, metamorphic rock, commonly in carbonatites, in sediments either as an authigenic or secondary mineral, and occasionally in granite pegmatites. Hundreds of widespread localities, but fine crystals may be found in Romania, Germany, Russia, Canada, the USA, Mexico, Peru, Argentina, South Africa, and Japan.

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

Rhodonite

Relatively common mineral named after the Greek rhodon for “rose,” describing the mineral’s rose red color. Hundreds of localities have rhodonite in manganese hydrothermal, contact and regionally metamorphosed, and sedimentary deposits.  Exceptional specimens come from Russia, Sweden, England, Romania, Italy, Australia, Japan, the USA, Brazil and Peru.

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

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