Pyrite
Iron Sulfide (FeS2)
Category
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
Pyrite
Iron Sulfide (FeS2)
Hematite
Iron(III) oxide (Fe2O3)
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
Quartz Geode
Silicon Dioxide (SiO2)
Plume Agate
Silicon Dioxide (SiO2)
Selenite (Satin Spar Gypsum)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
Pyrite
Iron Sulfide (FeS2)
Pyrite (Fool's Gold) Ore
Iron Disulfide (FeS2)
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
Quartz (Clear to Smokey)
Silicon Dioxide (SiO2)
Garnet (specifically Almandine)
Almandine (Fe3Al2(SiO4)3)
Geode (Unopened)
Silica Concretion / Geode (Formula: SiO2 for quartz internal contents)
Magnetite / Hematite rich ore
Magnetite (Fe3O4) or Hematite (Fe2O3)
Quartz Geode
Quartz (SiO2) in a Sedimentary Vug
Clear Quartz
Silicon Dioxide (SiO2)
Banded Agate
Cryptocrystalline variety of Quartz (SiO2)
Clear Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Chert (Pink and Yellow Chert)
Microcrystalline Quartz (SiO2)
Sandstone
Arenite (SiO2 primarily)
Limestone with Calcite Crust
Sedimentary Calcium Carbonate (CaCO3)
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Fancy Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Tumbled Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Picture Jasper
Silicon Dioxide (SiO2) with mineral inclusions
Sandstone (likely Siltstone variety)
Arenite / Siltstone (primary mineral SiO2)
Chert (Serpentinized)
Silicon Dioxide (SiO2) with mineral staining
Sandstone
Arenite
Sandstone
Arenite (primarily SiO2)
Sandstone
Arenite (typically composed of SiO2)
Sandstone (Quartzose)
Arenite (SiO2 based)
Sandstone (Calcareous Sandstone)
Calcareous Sandstone (primarily SiO2 with CaCO3 cement)
Sandstone
Arenite (primarily SiO2 with various cementing agents)
Brown Sandstone Pebble
Clastic Sandstone (SiO2 with iron oxides)
Sandstone (Water-worn)
Arenite
Dalmatian Jasper
Peralkaline Rhyolite (composed of Quartz, Feldspar, and Arfvedsonite)
Quartz (Druzy)
Silicon Dioxide (SiO2)
Orange Calcite
Calcium Carbonate (CaCO3)
Specular Hematite (on Schist/Matrix)
Hematite (Alpha-Fe2O3)
Optical Calcite
Calcium Carbonate (CaCO3)