Limestone Pebble
Limestone (Calcium Carbonate - CaCO3)
sedimentary
Category
Sedimentary (Man Made)
Browse sedimentary (man made) specimens identified by the Rock Identifier community.
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Sandstone (Grooved/Weathered)
Arenite (composed primarily of Quartz and Lithic fragments)
sedimentary
Sandstone with Secondary Mineral Encrustation
Arenite with Silica/Calcite deposits (SiO2 or CaCO3)
sedimentary
Blue calcite (likely)
Calcite, calcium carbonate (CaCO₃)
mineral
Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)
Diorite (Igneous rock, intrusive, intermediate composition)
Igneous Rock
Granite
Granite (composed primarily of silica-rich minerals like quartz and feldspar)
igneous
Granite
Plutonic felsic igneous rock
igneous
Rounded gray pebble
Uncertain; likely quartz-rich sandstone, quartzite, or graywacke
sedimentary
Weathered foliated metamorphic rock, likely gneiss or schist
Quartz–feldspar–mica metamorphic rock; exact identification requires a fresh surface and mineral tests
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper, Agate, Quartz Mix (Polished Beads)
SiO₂ (Silicon Dioxide) for Quartz. Jasper and Agate are cryptocrystalline varieties of Quartz.
Mineral/Semiprecious Gemstone (variety of Quartz)
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Fossiliferous Limestone
Limestone with fossil inclusions (CaCO3)
sedimentary
Sandstone (River Pebble)
Arenite (SiO2 based)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone Concretion
Sedimentary Concretion (Quartz sand bound by mineral cement)
sedimentary
Blue-green calcite (likely aragonite or apatite alternative)
Calcite, CaCO₃
mineral
Stromatolite
Biogenic Sedimentary Rock (composed predominantly of CaCO3)
sedimentary
Kambaba Jasper
Stromatolite (Fossilized Algae)
sedimentary
Chert (Chalcedony)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Granite
Felsic Plutonic Rock
igneous
Granite
Felsic Intrusive Igneous Rock
igneous
Granite
Granite (Phaneritic Igneous Rock)
igneous
Granite Pebble
Igneous Intrusive Rock (Quartz-Feldspar-Mica Phenocrysts)
igneous
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Granite
Felsic Plutonic Rock (Granite)
igneous
Sandstone (Weathered / Crushed)
Quartz Sandstone
sedimentary
Rounded river or beach pebble
Likely quartz-rich sandstone or quartzite; exact identification requires a close-grained view and hardness test
sedimentary
Metallic sulfide mineral specimen, likely pyrite
Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate
mineral
Polished Stone Pendant (Identity Unclear)
Unknown (Possibly Jasper/Agate/Quartz mixture)
mineral
Chalcedony
Silicon Dioxide (SiO2)
mineral
Fluorite Bracelet
Calcium Fluoride (CaF2)
mineral
Chert (Field Stone)
Microcrystalline Quartz (SiO2)
sedimentary
Coal
Combustible sedimentary rock
sedimentary
Pink Quartz
Silicon Dioxide (Quartz), SiO2
mineral
Conglomeratic sandstone or breccia
Lithic arkose / polymictic conglomeratic sandstone
sedimentary