Herderite vs Euclase
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Herderite
Herderite is a calcium beryllium phosphate mineral in the apatite group, with the formula CaBe(PO4)(F,OH). It crystallizes in the monoclinic system and commonly appears as colorless, pale-yellow, or greenish-white prismatic crystals; transparent crystals from Minas Gerais, Brazil, have been cut as gems. Herderite forms a compositional series with hydroxylherderite, a related mineral reported from...
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Euclase
Euclase is a rare beryllium aluminum silicate mineral with the chemical formula BeAlSiO₄(OH). Its name derives from the Greek words "eu" (good) and "klasis" (breakage), referring to its perfect cleavage. The mineral typically forms prismatic crystals in granitic pegmatites and hydrothermal veins, with colors ranging from colorless to pale blue, blue-green, and rarely deep blue. Gem-quality crystal...
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