Quartz pebble
Silicon dioxide (SiO2)
Category
Browse mineral on sedimentary specimens identified by the Rock Identifier community.
Quartz pebble
Silicon dioxide (SiO2)
Shale fragment
Shale (clay mineral rich sedimentary rock)
Granite (possibly granitic gneiss)
Felsic plutonic rock dominated by quartz, K-feldspar, plagioclase, biotite and/or hornblende
Limonite (Yellow Ochre)
Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)
Gypsum (Desert Rose or Selenite variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Polished picture jasper heart pendant
Picture jasper (microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions)
Gypsum (Satin Spar/Desert Rose variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Reddish weathered volcanic rock, probably andesite
Andesite (fine-grained plagioclase–pyroxene volcanic rock), possibly altered basalt
Quartz Pebble
Silicon dioxide (SiO2)
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Quartz Crystal Cluster
Silicon Dioxide (SiO2)
Pyrite
Iron Sulfide (FeS2)
Pyrite in Matrix
Iron Disulfide (FeS2)
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
Satin Spar (Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Limonite (Ochreous Sandstone)
Hydrous ferric oxides (FeO(OH)qnH2O)
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
Hematite
Iron(III) oxide, Fe2O3
Gypsum (Alabaster variety)
Calcium sulfate dihydrate (CaSO4·2H2O)
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
Satin Spar (often sold as Selenite)
Gypsum (CaSO4·2H2O)
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
Chert
Microcrystalline Quartz (SiO2)
Gypsum (variety Selenite or Alabaster)
Calcium sulfate dihydrate (CaSO4·2H2O)
Rhodochrosite
Manganese Carbonate (MnCO3)
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
Limonite Concretion / Ironstone
Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O
Iron Ore (Limonite and Hematite)
Goethite/Limonite (FeO(OH)·nH2O) and Hematite (Fe2O3)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Pyrite
Iron Disulfide (FeS2)
Pyrite
Iron sulfide (FeS2)
Rhodochrosite with Quartz
Manganese Carbonate (MnCO3) with Silicon Dioxide (SiO2)
Selenite (variety of Gypsum)
Calcium sulfate dihydrate (CaSO4·2H2O)
Clear Quartz
Silicon Dioxide (SiO2)
Satin Spar (often marketed as Selenite)
Gypsum (CaSO4·2H2O)
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite