Quartz (likely) / Siliceous rock with quartz phenocrysts (if a rock fragment)
Quartz (SiO₂)
Mineral
Category
Igneous And Sedimentary
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Granite Cobble
Phaneritic Felsic Igneous Rock (Granite)
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Pyrite
Iron Disulfide (FeS2)
mineral
Granite (Dioritic or Hornblende-rich)
Phaneritic Plutonic Felsic to Intermediate Igneous Rock
igneous
K2 Jasper (K2 Granite)
Azurite in Granite (Biotite Granite with Azurite inclusions)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase Feldspar)
igneous
Leopard Skin Jasper
Rhyolite (Silicon Dioxide with impurities), SiO2
igneous
Sandstone (Red)
Arenite (primarily Quartz, SiO2, with Iron Oxide cement)
sedimentary
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Black Sand (Magnetite Sand)
Magnetite-rich Placers (Fe3O4)
sedimentary
Quartz Sand/Gravel
Silicon Dioxide (SiO2)
sedimentary
Quartz River Cobble
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Gneiss
Gneiss
metamorphic
Gneiss
Gneiss
metamorphic
Greenstone / Graywacke
Metagraywacke or Chlorite Schist
metamorphic
Schist
Mica Schist
metamorphic
Feldspar
KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8
mineral
Clear Quartz Crystal
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Quartz (specifically Milky/White Quartz)
Silicon Dioxide (SiO2)
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Graphite
Graphite (Chemical Formula: C)
Mineral (Native Element)
Specular Hematite (Iron Ore)
Iron(III) oxide (Fe2O3)
mineral
Gneiss
Gneiss
metamorphic
Quartz (Milky/Smoky Crystal fragment)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Crystalline Silicon Dioxide (SiO2)
mineral
Banded Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz (Milky/Rose variety)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss
metamorphic
Hematite
Iron(III) oxide (Fe2O3)
mineral
Chalcedony (Agate/Blue Quartzite)
Silicon Dioxide (SiO2)
mineral
Quartz (Tumbled/Water-worn)
Silicon Dioxide (SiO2)
mineral