River Rock
Polished Siliceous Rock / Quartzite Pebble
sedimentary
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River Rock
Mixed composition, often quartzite, sandstone, or basalt
sedimentary
River Rock
Polished Quartzite / Silicified Sedimentary Rock
sedimentary
Limestone with Lichen/Moss
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Ferruginous)
Arenite (primarily SiO2 with iron oxide cement)
sedimentary
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary Rock
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Basalt
Extrusive mafic igneous rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss (with Mica and Quartz)
Gneissic Metamorphic Rock
metamorphic
Scoria
Vesicular Basaltic Rock
igneous
Sandstone
Arenite (Sedimentary Rock)
sedimentary
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartz Rock
Silicon Dioxide (SiO2)
mineral
Sandstone and Gravel Aggregate
Clastic Sedimentary Rock / Quartzose Sandstone
sedimentary
Biotite Schist
Biotite Schist
Metamorphic
Chert Breccia
Brecciated Chert
sedimentary
Jasper Pendant
Chalcedony (Quartz) - SiO2
Mineral/Sedimentary
Limestone Riprap
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Red Sandstone
Sedimentary Clastic Rock (Quartz Arenite)
sedimentary
Common Opal in Host Rock
Hydrated Silica (SiO2·nH2O)
mineraloid
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Sandstone
Arenite (primarily SiO2)
sedimentary
Basalt
Basalt (Mafic volcanic rock)
igneous
Quartz with Sericite and Cinnabar
Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)
mineral
Amygdaloidal Basalt
Extrusive Igneous Rock with Secondary Mineral Fillings
igneous
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Carnelian Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Limestone with Fossil Fragment
Bioclastic limestone (Calcium carbonate, CaCO3)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz, SiO2)
mineral
Sandstone with Iron Oxide Concretions
Quartzose Sandstone with Limonite/Hematite
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Jasper and Quartz
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble (with Dark Volcanic/Sedimentary Inclusion)
Silicon Dioxide (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tiger's Eye
Silicon dioxide (Quartz pseudomorph after crocidolite), SiO2
gemstone
Quartz Pebble (Iron-Stained Quartz)
Silicon Dioxide (SiO2) with Hematite/Limonite inclusion
mineral
Jasper
Silicon Dioxide (SiO2) - Microcrystalline Quartz
sedimentary
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
Sandstone with Dendritic Inclusions
Quartzose Sandstone
sedimentary