$Pentagonite is a rare silicate mineral with formula CaVOSi4O10ÃÂ·4H2O. It was named for the unusual twinning which produces an apparent five-fold symmetry. It is a dimorph of cavansite.Pentagonite was first described in 1973 for an occurrence in Lake Owyhee State Park, Malheur County, Oregon. It has also been reported from the Pune district of India. It occurs as fracture and cavity fillings in tuff and basalt. It occurs with cavansite, heulandite, stilbite, analcime, apophyllite and calcite.$

pentagonite ore on white background.

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amethyst apparent background cavansite cavosi4o104h2o crystal crystals dimorph fivefold for formula gem gemstone geological geologist geology isolated macro material metal mine mineral minerals named natural nature nugget object ore pentagonite precious produces rare raw rock sample science shiny silicate specimen stone symmetry texture twinning unusual was which white