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ifuckingloveminerals: Opal SiO2·nH2O
elwueonquedibuja: Ópalo ( SiO2 ) “Encendieron mi noche
fuckyeahmineralogy: (via Marin Mineral Company - New Mixed Minerals)
fuckyeahmineralogy: (via tucson2012-10) Amethyst (SiO2), a variety
fuckyeahmineralogy: These are all cross sections of stalactites,
underthescopemineral: Quartz, Calcite SiO2, CaCO3Locality:Traversella
underthescopemineral: Spangolite, Quartz Cu6Al(SO4)(OH)12Cl·3H2O,
underthescopemineral: Aragonite, Opal (Var: Opal-AN) CaCO3,
elwueonquedibuja: Ópalo ( SiO2 ) “Encendieron mi noche
americanapparel: Vanadium dioxide platelets on SiO2 substrate
elwueonquedibuja: Ópalo ( SiO2 ) “Encendieron mi noche y