Bluestoneisagenericmineraldescriptioncommonlyappliedtoavarietyofminerals.PerhapsthemostcommonreferenceistothehydratedcopperIIsulfatemineral,chalcanthite.Thename"bluestone"isalsoapplicablelazurite,thecorecomstituentoflapislazuli,asulfideofsodiumaluminiumsilicateinthesodalitegroup.ThetermbluestoneisalsousedforthedoleritestonesatStonehenge.Otherusesofthenamebluestonemayrefertoblue-greybuildingstoneorpavingmaterial.InAustraliaabluishvarietyofbasaltiswidelyusedforbuilding.Thenameshouldnotbeconfusedwithbluejohn,whichisablue/purplevarietyoffluorite,alsoknownasfluorspar,foundinDerbyshire,England。