Chert (Jasper)
Silicon dioxide (SiO2) with impurities
sedimentary
Category
Rock (Likely Sedimentary)
Browse rock (likely sedimentary) specimens identified by the Rock Identifier community.
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Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Yellow Jasper variant)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Plutonic Felsic Rock (Granite)
igneous
Quartz on Limestone
Silicon Dioxide (SiO2) on Calcium Carbonate (CaCO3)
Mineral on Sedimentary
Granite
Felsic Plutonic Igneous Rock
igneous
Schist
Crystalline Metamorphic Rock (Schist)
metamorphic
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Rounded brown pebble, likely quartz-rich sandstone or weathered quartzite
Indeterminate; probable quartz (SiO₂)-rich sandstone/quartzite with iron-oxide staining
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Quartz-veined metamorphic rock, likely greenschist or altered basalt
Chlorite–actinolite schist or metabasalt with a milky quartz vein
metamorphic
Orbicular granite (likely rapakivi-type granite)
Granite; chiefly quartz, alkali feldspar, plagioclase, and biotite/hornblende
igneous
River Pebble (likely Quartzite or Diorite)
Metamorphosed Quartz-rich Rock / Intermediate Igneous Rock
metamorphic
Fossil shell fragment
Indeterminate molluscan bioclast, likely aragonite or calcite
fossil
Fossilized Brachiopod Shell
Order Spiriferida (likely)
fossil
N/A - Image does not contain a rock or mineral
Anthropogenic textile material
Non-geological
Sandstone (Arkose)
Arkose Sandstone (SiO2 with KAlSi3O8)
sedimentary
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
Mineral
Amethyst and Calcite collection
Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)
mineral
Bivalve Seashell Fossil
Class Bivalvia
fossil
Quartzite river stone
Quartzite (SiO2 silicon dioxide)
metamorphic
Iron-rich vesicular rock, possibly slag or basalt
Uncertain; likely basaltic rock (plagioclase–pyroxene–iron oxide) or industrial iron slag
igneous
Quartz
Silicon Dioxide (SiO2)
Mineral
Porous quartz-rich rock, likely weathered rhyolite or silicified volcanic breccia
Rhyolite or volcanic breccia; predominantly microcrystalline quartz (SiO₂) with altered feldspar and iron oxides
igneous
Basalt (Weathered River Stone)
Basalt (SiO2 concentration approx. 45-52%)
igneous
Basalt (with possible fluidal texture)
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt Pebble
Extrusive Mafic Igneous Rock
igneous
Basalt (Weathered Pebble)
Extrusive mafic igneous rock; minerals primarily Plagioclase feldspar and Pyroxene
igneous
Milky quartz (likely quartz-rich rock)
Quartz, silicon dioxide (SiO₂)
mineral
Vesicular Basalt with Lichen
Vesicular Basalt
igneous
Quartz with Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Quartzite River Rock
Quartzite (SiO2)
metamorphic
Granite Pebble
Granite (Felsic Intrusive Igneous Rock)
igneous
Granite
Phaneritic Plutonic Felsic Rock (SiO2 > 69%)
igneous
Granite (Dioritic variant)
Granite (Phaneritic Igneous Rock)
igneous
Granite Pebble
Phaneritic Felsic Igneous Rock
igneous
Basalt
Basalt (Mafic Extrusive)
igneous
Quartz (Milky or Smoky variant)
Silicon Dioxide (SiO2)
mineral
Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite
Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain
mineral
Basalt
Basalt
igneous
Jasper
Silicon dioxide, SiO2
Mineral