Sandstone pebble
Clastic sedimentary rock (primarily SiO2)
sedimentary
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Fossiliferous Limestone
Biomicrite / Fossiliferous Limestone (CaCO3)
fossil
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Chert Arrowhead (Lithic Artifact)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Granite Pebble
Granite
igneous
Trace Fossil (Lichenandites or Rhynie Chert Chert with Microfossils)
Trace fossil in microcrystalline quartz (SiO2)
fossil
Blue Agate Geode Slice
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Gold
Native Gold (Au)
mineral
Granite Water-worn Cobble
Felsic intrusive igneous rock (Phaneritic)
igneous
Granite
Phaneritic intrusive igneous rock
igneous
Granite Water-Worn Pebble
Phaneritic Felsic Igneous Rock
igneous
Fossiliferous Limestone
Biogenic Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 principal composition)
sedimentary
Feldspar-rich Granite (Pink Granite)
Phaneritic Felsic Igneous Rock
igneous
Quartz Vein in Siltstone
SiO2 (Quartz) on clastic sedimentary matrix
sedimentary
Ferruginous Sandstone
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Granite Pebble
Felsic Plutonic Rock (primarily Quartz, Feldspar, and Mica)
igneous
Granite Pebble
Granite (Phaneritic Quartz-Feldspar intrusive rock)
igneous
Chert Nodule
Microcrystalline Quartz (SiO2)
sedimentary
River Pebble (Gneiss or Granite)
Metamorphic Rock (likely Gneiss or Granitic composition)
metamorphic
Granite Pebble
Granite (Felsic Plutonic Rock)
igneous
Fossilized Brachiopod/Bivalve in Limestone
Brachiopoda or Bivalvia fossil in Calcite/Limestone (CaCO3)
sedimentary
Granite Cobble
Phaneritic Felsic Igneous Rock
igneous
Tourmalinated Quartz
Silicon Dioxide (SiO2) with Schorl inclusions (NaFe2+3Al6(BO3)3Si6O18(OH)4)
mineral
Titanium Quartz (Rough)
Titanium-included Silicon Dioxide (SiO2 + Ti)
mineral
Chalcedony (Tumbled Agate/Jasper)
Silicon dioxide (SiO2)
sedimentary
Quartzite (River Pebble)
Metamorphic Quartzite (SiO2)
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Rhodochrosite
Rhodochrosite (MnCO3)
mineral
Agate (or Operculum / Fossil Shell)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Chert or Limestone
Sedimentary rock containing fossilized marine invertebrates (likely crinoid stems or bryozoans)
sedimentary
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
White Opal (Common)
Hydrated Silica (SiO2·nH2O)
mineral
Amazonite
Microcline (variety Amazonite), K(AlSi3O8)
mineral
Jasper Breccia
Silicon Dioxide (SiO2) with impurities
sedimentary
Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Grape Agate
Botryoidal Amethystine Chalcedony (SiO2)
mineral
Diorite (Dalmatian Stone)
Diorite (Intermediate Plutonic Rock)
igneous