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Euchroite

Named in reference to its beautiful emerald green color after the Greek words eu, used as a prefix to mean “fair” or “good,” and, chroma, meaning “color.” Euchroite is a rare mineral that can be found in localities in Slovakia, Greece, Bulgaria, the United States, and others and occurs in oxidized copper-bearing hydrothermal deposits. Minerals associated with Euchroite include olivenite, strashimirite, azurite, and malachite.

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

Euclase

Named for the Greek words eu, used as a prefix to mean “fair” or “good,” and, probably, klas, which means “fraction,” likely in reference to the minerals perfect cleavability and cleavage. Euclase is an uncommon mineral that occurs as a decomposition product of beryl in pegmatites, and occurs in low-temperature aplite veins. Many localities, but fine crystals come from localities in Russia, Germany, Mozambique, Tanzania, Zimbabwe, Brazil, and Columbia.

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

Eudidymite

Named after a combination of the Greek words eu, used as a prefix to mean “fair” or “good,” and didymos, meaning “twinned,” in reference to the mineral’s common appearance as twinned crystals. Eudidymite is an uncommon mineral that occurs in Norway, England, the Czech Republic, Russia, Canada, Malawi, and others as a late-stage mineral in alkaline nepheline syenite pegmatites. Associated minerals include albite, neptunite, aegirine, elpidite, natrolite, analcime, fluorite, and quartz.

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

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