Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Chert (Iron-stained)
Microcrystalline Quartz (SiO2)
sedimentary
Banded Agate
Silicon dioxide (SiO2) - variety of Chalcedony
sedimentary
Chert (Flint Nobule)
Silicon Dioxide (SiO2)
sedimentary
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite
sedimentary
Sandstone (likely Quartzite-rich)
Arenite (primarily SiO2)
sedimentary
Likely weathered metallic mineral or slag fragment
Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag
mineral
Basalt Pebble
Basalt (Mafic volcanic rock)
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Likely weathered iron-rich stone
Uncertain; possibly limonite/goethite-bearing rock
mineral
Banded Agate
Agate (Cryptocrystalline Quartz, SiO2)
mineral
Agate Geode
Silicon Dioxide (SiO2)
mineral
Vesicular Basalt
Mafic Igneous Rock (primarily Plagioclase and Pyroxene)
igneous
Chert (Jasper/Mudstone variant)
Silicon Dioxide (SiO2)
sedimentary
Ferruginous Sandstone
Ferruginous Clastic Sedimentary Rock
sedimentary
Ruby / Pink Sapphire
Corundum (Al2O3 with Chromium impurities)
gemstone
Basalt with Secondary Mineralization (Likely Zeolites or Calcite)
Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)
igneous
Basalt and Andesite Gravel
Aphanitic Mafic-Intermediate Volcanic Rock
igneous
Fossilized bivalve shell
Bivalvia (likely a venerid or similar clam); shell composed mainly of CaCO₃ as aragonite/calcite
fossil
Quartzite River Rock
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
River Stone (likely Siltstone or fine-grained Quartzite)
Sedimentary clastic rock containing SiO2 and iron oxides
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Yellow Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Mica Schist
Muscovite/Biotite Schist
metamorphic
Fossilized bivalve shell in limestone
Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock
fossil
Almandine Garnet
Almandine (Fe3Al2Si3O12)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Brecciated jasper (likely ocean jasper or rhyolitic jasper)
Silica-rich volcanic breccia composed mainly of microcrystalline quartz/chalcedony (SiO₂), with iron-oxide staining and possible feldspar
igneous
Sandstone (Yellow/Tan Sandstone)
Arenite (primarily Quartz, SiO2)
sedimentary
Tumbled jasper, likely picture jasper or brecciated jasper
Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments
mineral
Quartzite
Metamorphic rock primarily composed of Quartz (SiO2)
metamorphic
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) within Matrix
igneous/metamorphic
Anthracite Coal
Anthracite (Carbon-based metamorphic rock)
metamorphic
Sandstone (Quartz Arenite)
Clastic Sedimentary Rock - Quartz Arenite
sedimentary
Banded Sandstone (Differential Weathering)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Granodiorite Pebble
Granodiorite
igneous
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary