Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Category
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Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Snowflake Obsidian
Vitreous Silica with Spherulite inclusions (Amorphous SiO2)
igneous
Clear Quartz
Silicon dioxide (SiO2)
mineral
Granite Pegmatite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Septarian Nodule (Septarian Dragon Stone)
Septarian Concretion (CaCO3 + Al2Si2O5(OH)4)
sedimentary
Quartz (Druzy) on Matrix
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Crocidolite (SiO2 with iron oxides)
mineral
Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Granite
Granite (Phaneritic Igneous Rock)
igneous
Sandstone (with garnet granules)
Clastic sedimentary rock (primarily SiO2 with Fe3Al2(SiO4)3 inclusions)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Carnelian
Carnelian (SiO2 with Iron Oxide impurities)
mineral
Agate
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
metamorphic
Granite
Granite (a felsic intrusive igneous rock)
Igneous Rock
Petrified Wood
Silicified wood (primarily Silicon Dioxide, SiO2)
metamorphic
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Tiger's Eye (Unpolished)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Gold-bearing Quartz Ore
Auriferous Quartz (SiO2 with Au)
mineral
Auriferous Quartz (Gold-bearing Quartz)
Silicon Dioxide (SiO2) with Elemental Gold (Au)
mineral
Dyed Agate Geode
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Carnelian Agate
Silicon Dioxide (SiO2) with Hematite impurities
mineral
Carnelian
Chalcedony (SiO2) with Iron Oxide inclusions
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Jasper
Silicon Dioxide (SiO2) with impurities
mineral
Yellow Quartz (Chalcedony)
Quartz / Chalcedony (Silicon Dioxide, SiO2)
mineral
Basalt
Mafic Igneous Rock (composed primarily of plagioclase feldspar and pyroxene)
igneous
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO₂)
metamorphic
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Emerald in Matrix
Beryl (Be3Al2Si6O18)
mineral
Ferruginous Sandstone
Clastic sedimentary rock (primarily SiO2 with Fe2O3 cement)
sedimentary
Sandstone Pebble
Arenite (primarily SiO2)
sedimentary
Granodiorite
Granodiorite (containing Quartz, Plagioclase Feldspar, Biotite, and Hornblende)
igneous
Banded Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphism)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous