Euclase

    Euclase is a beryllium aluminium hydroxide silicate mineral (BeAlSiO₄(OH)). It crystallizes in the monoclinic crystal system and is typically massive to fibrous as well as in slender prismatic crystals. It is related to beryl (Be₃Al₂Si₆O₁₈) and other beryllium minerals. It is a product of the decomposition of beryl in pegmatites.

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It was first reported in 1792 from the Orenburg district in the southern Urals, Russia. Its type locality is Ouro Prêto, Minas Gerais, Southeast Region, Brazil.

References

• Webmineral data
• Mindat with location data
• Mineral Data Publishers PDF