Conglomerate
Clastic Sedimentary Rock (Conglomerate)
sedimentary
Category
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Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Granite
Intrusive Felsic Igneous Rock
igneous
Quartzite Conglomerate
Conglomerate (clastic sedimentary rock)
sedimentary
Sandstone Pebble
Arenite (SiO2 primarily)
sedimentary
Sandstone Cobble with Iron Staining
Arenite with Limonite/Goethite coatings
sedimentary
Yellow Quartz or Citrine Geode/Cluster
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Intrusive Igneous Rock
igneous
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Sandstone
Quartz Arenite / Clastic Sedimentary Rock
sedimentary
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Granite and Mixed Landscape Gravel
Plutonic Igneous Rock / Weathered Alluvium
igneous
Quartz Pebble (Beach Agate / Chalcedony)
Silicon Dioxide (SiO2)
mineral
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Sandstone
Arenite (predominantly Quartz Sandstone)
sedimentary
Sandstone (likely Quartzose Sandstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Hagstone (Adder Stone)
Chert or Sedimentary pebble with natural perforation
sedimentary
Vesicular Basalt River Rock
Vesicular Basalt
igneous
Pumice
Pumice (Highly vesicular volcanic glass)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Sandstone
Sandstone (SiO2 dominated)
sedimentary
Granite
Phaneritic Felsic Igneous Rock (composed of quartz, feldspar, and mica)
igneous
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Red Sandstone Pebble
SiO2 with Fe2O3 (Quartz sandstone with hematite coating)
sedimentary
Sandstone Pebble
Arenite (SiO2 based)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 staining)
sedimentary
Shale
Lutaceous Sedimentary Rock
sedimentary
Druzy Chalcedony (Agate Geode)
Silica (SiO2) - Cryptocrystalline Quartz with druzy macrocrystalline quartz
mineral
Ferruginous Sandstone (Red Sandstone)
Arenite with Hematite/Limonite cement
sedimentary
Chalcedony (Agate/Quartz)
Silicon Dioxide (SiO2)
mineral
Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)
Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)
mineral
Yellow Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone (with Iron Oxide)
Quartz Arenite / Ferruginous Sandstone (SiO2 with Fe2O3)
sedimentary
Sandstone (Beach Pebble)
Clastic sedimentary rock (primarily Quartz and Feldspar)
sedimentary