Sandstone (Ferruginous)
Sandstone (primarily SiO2 with iron oxide Fe2O3 staining)
sedimentary
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Quartz-rich gravel fragment
Quartz (silicon dioxide, SiO₂), possibly with feldspar or carbonate inclusions
mineral
Red Sandstone
Arenite (SiO2 with Fe2O3)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (Felsic to Mafic Metamorphic Rock)
metamorphic
Quartz Druzy
Silicon Dioxide (SiO2)
mineral
Granite Pebble
Granite (Plutonic Igneous Rock)
igneous
Granite
Intrusive igneous rock
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Quartz Geode (likely within Limestone or Dolomite matrix)
Quartz (SiO₂)
Mineral within a Sedimentary Rock
Banded Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Tektite
Impactite (Natural Silicate Glass)
meteorite
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Shale
Clastic Sedimentary Rock
sedimentary
Quartz Vein in Sedimentary Rock
Silicon Dioxide (SiO2) with host Chert or Limestone
mineral
Sandstone
Arenite
sedimentary
Sandstone
Arenite (predominantly SiO2 quartz grains)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Banded Igneous Dike Rock
Intrusive igneous rock with felsic/mafic banding
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone
Clastic sedimentary rock (Quartz arenite)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Fossilized Bone
Permineralized Vertebrate Bone
fossil
Sandstone
Clastic sedimentary rock (Quartz arenite or arkose)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron Oxide (Limonite/Hematite) coating
sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Tumbled Stone
Silicon dioxide / Various silicates
mineral
Quartz-veined Metamorphic Rock
Quartz Vein in Phyllite or Schist (SiO2 in Silicate Matrix)
metamorphic
Banded River Rock with Quartz Vein
Siltstone/Greywacke with Quartz (SiO2)
sedimentary
Granite or Porphyritic Igneous Rock (weathered)
Granitoid
Igneous
Desert Varnish on Sandstone
Ferromanganese coating on Quartz Arenite
sedimentary
Bivalve Seashell Fossil
Class Bivalvia
fossil
Granite
Felsic intrusive igneous rock
igneous
Granite fragment
Granite; mainly quartz (SiO₂), feldspar, and mica
igneous
Geode with Quartz and possibly Jasper/Hematite
Quartz (SiO2) and Chalcedony (cryptocrystalline SiO2), possibly stained by iron oxides
Mineral/Sedimentary Geode
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Agate
Silicon Dioxide (SiO2) - variety Chalcedony
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Concretion
Sedimentary Concretion
sedimentary
Granite
Intrusive Igneous Rock
igneous
Milky quartz with dark mineral veins
Quartz, silicon dioxide (SiO₂), likely massive vein quartz; dark veins may be chlorite, mica, iron/manganese oxides, or a sulfide mineral
mineral