Quartz Pebble (Citrine-colored or Stained Quartz)
Silicon Dioxide (SiO2)
mineral
Category
Industrial Byproduct (Anthropogenic Rock)
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Yellow Quartz (Citrine/Yellow Jasper mix)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Garnet-Bearing Gneiss
Almandine-Garnet Gneiss
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Schist (Chlorite or Mica-rich)
Chlorite Schist
metamorphic
Quartz (Double-Terminated)
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (composed primarily of SiO2)
metamorphic
Polished agate geode
Chalcedony (microcrystalline quartz, SiO₂) with quartz druse crystals
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Pumice
Vesicular Rhyolite / Pumice
igneous
Schist
Mica Schist
metamorphic
Green Druzy Quartz (Prasiolite)
Silicon Dioxide (SiO2) with inclusions (typically Chlorite or Actinolite)
mineral
Blue Topaz
Al2SiO4(F,OH)2
gemstone
Granite
Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)
igneous
Quartzite River Cobble
Quartzite (primarily SiO2)
metamorphic
Banded Chalcedony (Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Chert (specifically Flint or Dark Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Agate
Cryptocrystalline Quartz (SiO2)
mineral
Likely weathered fossil bone fragment
Indeterminate fossilized bone; taxonomic identification requires microscopy and locality data
fossil
Chert (Chalcedony/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Opalite (Man-made Glass)
Synthetic Silicon Dioxide Glass (SiO2 + metal oxides)
Synthetic Mineral Simulant / Glass
Red Jasper (Quartz)
Silicon Dioxide (SiO2) with Iron impurities
sedimentary
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Sapphire (Corundum)
Corundum (Al2O3)
mineral
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Pink Granite
Phaneritic intrusive felsic igneous rock
igneous
Quartzite Pebble
Quartzite (predominantly Silicon Dioxide - SiO2)
metamorphic
Pegmatite (Granitic Pegmatite with Quartz and Feldspar)
Intrusive Igneous Rock (Granitic Pegmatite)
igneous
Weathered quartz-rich rock, possibly quartzite or quartz vein material
Quartz (SiO₂), likely with feldspar, mica, and iron-oxide staining
metamorphic
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)
metamorphic
Colorless faceted gemstone (likely cubic zirconia)
Cubic zirconia, zirconium dioxide (ZrO₂); possibly synthetic quartz or glass imitation
gemstone
Druzy Quartz on Matrix
Silicon Dioxide (SiO2)
mineral
Wishing Stone (Quartz-veined Siltstone or Graywacke)
Hydrothermal Quartz vein in matrix of SiO2 (Quartz) and Al2O3 (Clay minerals)
sedimentary
Weathered iron-rich rock, possibly basalt or ironstone
Uncertain; likely weathered basalt (plagioclase–pyroxene) or hematite/goethite-bearing ironstone
igneous
Porphyritic Basalt (likely artificially dyed or altered)
Basalt with plagioclase phenocrysts (likely treated)
igneous