Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Category
Mineralogical Specimen
Browse mineralogical specimen specimens identified by the Rock Identifier community.
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Iron-stained Quartz
Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)
mineral
Granite Cobble
Granite (Felsic Plutonic Rock)
igneous
Chert (specifically Chalcedony/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Granite Cobble
Felsic Intrusive Igneous Rock
igneous
White Quartz with Black Tourmaline
Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)
Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)
sedimentary
Chert (Smooth River Pebble)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Howlite (Dyed to resemble Turquoise)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Magnetite / Iron-Rich Concretion
Magnetite (Fe3O4) or Bog Iron Limonite
mineral
Quartzite
Quartzite
metamorphic
Pyrite in Matrix
Iron Disulfide (FeS2)
mineral
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
mineral
Sandstone with Algae Growth
Arenite with Chlorophyta/Lichen
sedimentary
Prehnite
Prehnite, Ca2Al(AlSi3O10)(OH)2
mineral
Chert Pebble
Microcrystalline silica (SiO2)
sedimentary
Honey Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite (River Pebble)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Honey Calcite
Calcite (Calcium Carbonate - CaCO3)
mineral
Chert (Iron-stained)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Synthetic Resin Charm (Seal Shape)
Polymer Resin with plastic glitter / Polyethylene terephthalate glitters
Synthetic material (Not a rock or mineral)
Fossiliferous Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Chert
Microcrystalline Silicon Dioxide (SiO2)
sedimentary
Chert (White Chert/Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert Pebble
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Granite
Granite (Phaneritic Igneous Rock)
igneous
Agate Geode Node
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone (Painted)
Arenite (primarily SiO2)
sedimentary
Garnet Schist
Almandine-mica schist
metamorphic
Rough Diamond
Diamond (Native Carbon), C
mineral
Quartzite with inclusions
Quartzite (SiO2)
metamorphic
Granite
Granite
igneous
Quartzite Pebble
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Crinoid and Coral Fossils in Limestone
Fossiliferous Limestone with Rugosa (order) and Crinoidea (class)
sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2 with iron oxide impurities)
sedimentary
Basalt with Quartz/Feldspar Inclusions
Amygdaloidal or Porphyritic Mafic Volcanic Rock with Siliceous Veining
igneous
N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Schist with Biotite and Quartz
Biotite-Quartz Schist (Fe,Mg,Al silicate mix)
metamorphic
Fossiliferous Limestone
Fossiliferous Limestone (containing bioclasts)
sedimentary
Fossiliferous Limestone (Crinoidal)
Calcium Carbonate (CaCO3) - Limestone containing bioclasts
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary