Quartz (Common Quartz Pebble)
Silicon Dioxide (SiO2)
mineral
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Rhyolitic Tuff
Rhyolitic Tuff / Pyroclastic rock
igneous
Hematite (likely Botryoidal or Specularite variant)
Iron(III) oxide (Fe2O3)
mineral
Iron-rich meteorite candidate
Undetermined meteoritic iron–nickel material; possibly an ordinary chondrite or weathered iron meteorite
meteorite
Likely flint or chert fragment
Microcrystalline quartz (SiO₂), probably flint/chert
sedimentary
Sandstone (River Cobble)
Sandstone (principally composed of Quartz, SiO2)
sedimentary
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Porphyritic Andesite
Andesite
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Pink Granite
Granite (Alkali-feldspar granite)
igneous
Sandstone
Sedimentary rock composed mainly of quartz sand
sedimentary
Pink Quartzite
Quartzite (High-silica metamorphic rock)
metamorphic
Fluorite (likely)
Calcium Fluoride (CaF2)
Mineral
Polished pale stone, likely limestone or quartzite pebble
Most consistent with micritic limestone (calcite, CaCO₃), though the image cannot confirm mineralogy
sedimentary
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Chert (Iron-stained)
Silicon Dioxide (SiO2)
sedimentary
Rounded granite pebble
Granite, chiefly quartz, feldspar, and mica; approximate composition SiO₂-rich felsic rock
igneous
Quartz-rich sandstone or quartzite cobble
Quartz arenite; possibly weakly metamorphosed quartzite (SiO₂-dominant)
sedimentary
Likely black beach pebble
Undetermined; possibly basalt, chert, or dark slate
sedimentary
Chert (White-Tan)
Silicon dioxide (SiO2)
sedimentary
Chert / Fossilized Burrow Cast
Microcrystalline Quartz (SiO2) with Trace Carbonates
sedimentary
Chert (Flint Pebbles)
Microcrystalline quartz (SiO2)
sedimentary
Ocean Jasper
Spherulitic Chalcedony (SiO2)
sedimentary
Fossil Shark Tooth
Carcharocles (Otodus) sp. or similar fossilized Chondrichthyes tooth
sedimentary
Chert (Tan/Yellow variety)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous limestone, likely coral or shell fragment
Calcitic limestone (primarily CaCO₃), containing preserved marine bioclasts
fossil
River Pebble (Siltstone / Fine Sandstone)
Sedimentary Rock (siliciclastic clastic rock)
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Likely iron-rich chert or jasper
Microcrystalline quartz (SiO₂), variably stained by iron oxides/hydroxides
sedimentary
Jasper Pebble
Silicon dioxide (SiO2) with iron oxide impurities
sedimentary
Fossilized Megalodon Tooth Fragment
Otodus megalodon (Carcharocles megalodon fossil)
sedimentary
Limestone with Gastropod Fossil
Sedimentary Calcium Carbonate (CaCO3) with Gastropoda inclusion
fossil
Sandstone
Clastic Sedimentary Rock
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartzite with inclusions or a banded chert
Quartzite or Chert
Metamorphic or Sedimentary
Possible basalt or weathered mafic rock
Basalt; chiefly plagioclase feldspar and pyroxene, commonly with olivine and iron oxides
igneous
Quartzite (with mineral vein)
Metamorphosed Quartz-rich Sandstone (SiO2)
metamorphic
Banded Chert / Jasper
Silicon Dioxide (SiO2)
sedimentary
Bivalve Fossil (Clam Shell)
Class Bivalvia
fossil
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) with Quartz Crystals on Clastic Sedimentary Rock
sedimentary