Hellyerite, NiCO3·6(H2O), is a hydrated nickel carbonate mineral. It is light blue to bright green in colour, has a hardness of 2.5, a vitreous luster, a white streak and crystallises in the monoclinic system. The crystal habit is as platy and mammillary encrustations on its matrix. It is a pentahydrate according to X-ray crystallography. The solid consists of [Ni2(CO3)2(H2O)8] subunits with an extra pair of water of hydration.
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La hellyerita es un mineral carbonato y por lo tanto de la llamada clase de los minerales carbonatos y nitratos. Fue descubierta en 1958 en una mina del distrito de , en la isla de Tasmania (Australia), siendo nombrada en honor de Henry Hellyer, supervisor de dicha mina.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).