Quartz-veined Gneiss
Gneiss with Quartz (SiO2) intrusions
metamorphic
Category
Sedimentary Or Igneous
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Pyrite (on host rock)
Iron Sulfide (FeS2)
mineral
Gneiss (specifically Banded Gneiss)
Gneiss
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)
metamorphic
Pyrite (on Quartz matrix)
Iron Sulfide (FeS2)
mineral
Quartz (specifically Milky or Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Banded Calcite (often sold as Mexican Onyx)
Calcium Carbonate (CaCO3)
mineral
Mica-rich Schist fragment
Mica Schist
metamorphic
Chalcedony (Agate)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Micaceous Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Gneiss
Gneiss (foliated metamorphic rock)
metamorphic
Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Clear/White Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz (Milky or Druzy Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz Drusy on Matrix
Silicon Dioxide (SiO2)
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Chlorite or Actinolite
sedimentary
Greenstone / Greenschist
Greenschist facies metamorphic rock
metamorphic
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Greenstone / Glauconitic Siltstone
Metabasalt or Glauconite-rich Sedimentary Rock
metamorphic or sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Granite Sand (Decomposed Granite)
Grus / Quartz-Feldspar Detritus
sedimentary
Bumblebee Jasper
Volcanic Tuff (mixture of Quartz, Sulfur, Hematite, and Orpiment)
igneous
Quartz Vein in Host Rock
Quartz (SiO2) in Mafic or Sedimentary Matrix
igneous
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 inclusions)
sedimentary
Gneiss (River Cobble)
Metamorphic Gneiss
metamorphic
Agate Geode with Quartz Druzy
Cryptocrystalline Quartz (SiO2)
sedimentary
Jasper
Silicon dioxide (SiO2)
sedimentary
General Gravel (River Rock/River Stones)
Mixed Lithic Sediments (Conglomerate Clasts)
sedimentary
River Rock (Basalt/Greywacke)
Aphanitic Basalt or Lithic Sandstone (Greywacke)
igneous
Sandstone (Micaceous Sandstone)
Arenite (SiO2 with KAl2(AlSi3O10)(OH)2 inclusions)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Dalmatian Jasper (Dalmatian Stone)
Peralkaline rhyolite
igneous
Milky Quartz
Silicon Dioxide (SiO2)
mineral