Chert (Pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Industrial Byproduct (Anthropogenic Rock Like Material)
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Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Fossilized Bone
Permineralized Bone (Vertebrate Fossil)
fossil
Quartz with Mica Schist
Quartz-Mica Schist / Pegmatitic Quartz
metamorphic
Olivine in Basalt matrix
Peridotite (Mg, Fe)2SiO4
igneous
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Coquina or Fossiliferous Limestone
Fossiliferous Limstone (CaCO3)
sedimentary
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Schist
Mica Schist
metamorphic
Druzy Quartz on Sandstone
Silicon Dioxide (SiO2) on Sedimentary Host Rock
mineral
Chert (Jasper/Flint variety)
Silicon Dioxide (SiO2)
sedimentary
River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)
Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)
Sedimentary
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
sedimentary
Scoria
Scoria (vesicular basalt-andesite)
igneous
Pumice
Pumicite (Volcanic glass with vesicular texture)
igneous
Tiny amber-colored crystal fragment
Indeterminate; possibly quartz, feldspar, mica, or a sulfide mineral
mineral
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Sandstone (Ferruginous)
Arenite (SiO2 with iron oxide impurities)
sedimentary
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic intrusive igneous rock (Composition: Quartz, Feldspar, Mica)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Fossil Shell
Invertebrate fossil (Mollusca)
fossil
Green glass-like cabochon, likely synthetic glass or resin
Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin
gemstone
Quartz Druse (on Chalcedony/Agate base)
Silicon Dioxide (SiO2)
mineral
Limestone (specifically Grainstone or Micrite)
Calcium Carbonate (CaCO3)
sedimentary
Iron-stained quartz-rich rock, possibly quartzite or hydrothermal quartz
Quartz (SiO₂), likely with iron oxides; exact host rock uncertain from the photograph
metamorphic
Sandstone
Arenite
sedimentary
Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Chert Nodule (with Geode cavity)
Cryptocrystalline Quartz (SiO2)
sedimentary
Slate
Slate (Metamorphic Rock)
metamorphic
Yellow Quartzite Pebble
Quartzite (SiO2)
metamorphic
Sandstone (with Iron Staining)
Arenite (SiO2 with Fe2O3/FeOOH impurities)
sedimentary
Chert / Flint
Silicon Dioxide (SiO2)
sedimentary
Rhyolite
Rhyolite (felsic volcanic rock)
igneous
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Limestone
Sedimentary Rock (Primarily CaCO3)
sedimentary
Sandstone (Heart-shaped pebble)
Sedimentary Quartz Sandstone
sedimentary
Sandstone
Arenite
sedimentary