Pentagonite is a rare silicate mineral with formula Ca(VO)Si4O10ยท4(H2O).
It was named for the unusual twinning called a fiveling with an apparent five-fold symmetry.[ It is a dimorph of cavansite.
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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.][
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