Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Category
Mineral Or Sedimentary (If Chert)
Browse mineral or sedimentary (if chert) specimens identified by the Rock Identifier community.
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Sandstone (Quartzite-rich)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Aragonite Star Cluster
Aragonite (Calcium Carbonate, CaCO3)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Shale (with Iron Oxide staining)
Fissile Mudstone (primarily Quartz and Clay minerals)
sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Geode (Unbroken)
Silicon Dioxide (SiO2) usually as Microcrystalline Quartz or Chalcedony
sedimentary
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Selenite (Satin Spar)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Hematite (Tumbled)
Iron(III) oxide (Fe2O3)
mineral
Jasper
Silicon dioxide (SiO2) with impurities
sedimentary
Quartz (Citrine or Iron-Stained variety)
Silicon Dioxide (SiO2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Geode (Cracked)
Quartz (Silicon Dioxide, SiO2)
sedimentary
Selenite (Gypsum Variety)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Celestite (Celestine)
Strontium sulfate (SrSO4)
Mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Satin Spar (Selenite)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Variscite in Matrix
Variscite (AlPO4 · 2H2O)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Cryptocrystalline Quartz (SiO2)
sedimentary
Pyrite
Iron Disulfide (FeS2)
mineral
Marble
Metamorphosed Limestone (calcite formulation CaCO3)
metamorphic
Pyrite
Iron Pyrite (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Carnelian
SiO2 (Silicon Dioxide), a variety of Chalcedony
mineral
Green Calcite
Calcium Carbonate (CaCO3)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite (on host rock/ore)
Iron Sulfide (FeS2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral