Sandstone
Arenite
sedimentary
Category
Sedimentary Or Mineral
Browse sedimentary or mineral specimens identified by the Rock Identifier community.
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Mixed Tumbled Gemstones (Agate, Aventurine, Pyrite, etc.)
Multiple (principally Silicon Dioxide SiO2 and Iron Disulfide FeS2)
mineral
Sandstone (Pebble)
Sandstone (principally SiO2 with iron oxide impurities)
sedimentary
Quartz Geode Fragment
Silicon Dioxide (SiO2)
sedimentary
Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Limonite (Ironstone)
Goethite/Limonite (Hydrated iron(III) oxide-hydroxide)
mineral
Selenite (Satin Spar)
Gypsum (CaSO4·2H2O)
mineral
Satin Spar (often sold as Selenite)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Satin Spar Selenite
Gypsum (CaSO4·2H2O)
mineral
Yellow Ochre (Limonite)
Limonite (FeO(OH)·nH2O)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Ferruginous Sandstone
Arenite with Iron-Oxide cement (Fe2O3 · nH2O)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone
Arenite
sedimentary
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Sandstone
Sandstone (principally SiO2/Silicon Dioxide)
sedimentary
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)
mineral
Sandstone (River Cobble / Pebble)
Sedimentary Rock (Quartz Sandstone / Arenite)
sedimentary
Quartz Veined Mudstone
Metasedimentary rock with Quartz (SiO2) veins
metamorphic
Quartz Geode Fragment
Crystalline Silicon Dioxide (SiO2)
mineral
Satin Spar Selenite
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Satin Spar (Selenite)
Gypsum (CaSO4·2H2O)
mineral
Jasper (Chert / Chalcedony)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sedimentary Breccia
Clastic Breccia (CaCO3/SiO2 matrix)
sedimentary
Silty Shale
Silty Shale (Fissile Sedimentary Rock)
sedimentary
Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
sedimentary
Black Sand (Magnetite/Heavy Mineral Concentrate)
Magnetite-rich Placers (Fe3O4)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Mixed Mineral and Rock Collection
Mixed geological specimens (Quartz, Amethyst, Rose Quartz, Jasper, Epidote, Chert)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock), SiO2 + various minerals
sedimentary
Ironstone Concretion / Limonite-stained Siltstone
Ironstone (primarily Limonite FeO(OH)·nH2O and Siltstone)
sedimentary
Limonite pseudo-concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Sandstone
Arenite
sedimentary
Shale
Shale (Lutite)
sedimentary
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Jasper or Agate
Silicon dioxide (SiO2)
Mineral
Gneiss
Gneiss
metamorphic