Magnetic Sand Grain / Magnetite Pellet
Magnetite (Fe3O4)
mineral
Category
Sedimentary (Fossiliferous)
Browse sedimentary (fossiliferous) specimens identified by the Rock Identifier community.
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Blue Celestite (Celestine)
Strontium sulfate (SrSO4)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Quartz Crystal Fragment
Silicon Dioxide (SiO2)
mineral
Satin Spar (often sold as Selenite)
Gypsum (CaSO4·2H2O)
mineral
Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Garnet (specifically Almandine)
Almandine - Fe3Al2(SiO4)3
metamorphic
Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).
Galena (PbS)
mineral
Satin Spar (Gypsum)
Hydrous Calcium Sulfate (CaSO4·2H2O)
mineral
Satin Spar (Satin Spar Selenite)
Gypsum (CaSO4·2H2O)
mineral
Quartz (Granular)
Silicon Dioxide (SiO2)
mineral
Fossil Coral in Limestone
Scleractinia (Anthomastodon or similar) in Sedimentary Calcarenite
fossil
Coal
Coal (Sedimentary Rock / Organic Rock)
sedimentary
Banded Sandstone
Clastic Sedimentary Rock (Quartz Arenite)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Siltstone with Fossil Cast
Sedimentary Rock (Siltstone / Fine-grained Sandstone)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Sandstone Geode
Sedimentary Geode (Silica/Calcite composition)
sedimentary
Ironstone Concretion (Limonite/Goethite)
Iron-rich sedimentary rock (FeOx)
sedimentary
Chert (Flint / Quartz Nodule)
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limonite Concretion
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)wnH2O)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert
Silicon dioxide (SiO2) - Microcrystalline quartz
Sedimentary
Limonite (Iron Ore)
Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Rounded brown pebble, likely quartz-rich sandstone or weathered quartzite
Indeterminate; probable quartz (SiO₂)-rich sandstone/quartzite with iron-oxide staining
sedimentary
Quartz-rich metamorphic rock, likely quartzite
Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide impurities
metamorphic
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Pebble)
Sandstone (SiO2 with matrix/cement)
sedimentary
Claystone / Mudstone
Mudstone (Hydrous aluminum silicate rich rock)
sedimentary
Sandstone / Limestone
Sedimentary Rock (Quartz Sandstone or Calcareous Grainstone)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (River Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 dominant)
sedimentary