Chert
Microcrystalline Quartz (SiO2)
sedimentary
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Unidentified dark pebble
Unknown
rock
Tumbled Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Flint
Microcrystalline quartz (SiO2)
sedimentary
Tumbled Tiger's Eye
Silicon dioxide with crocidolite inclusions (SiO2)
mineral
Generic Rock / River Pebble
Lithic fragment / Quartzite pebble
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Crinoid Stem Fossil (Indian Bead)
Crinoid ossicle (Echinodermata)
fossil
Fossilized Shark Tooth
Chondrichthyes (class)
fossil
Quartz
Silicon Dioxide (SiO2)
mineral
Jasper
Silicon dioxide (Microcrystalline quartz, SiO2)
mineral
Quartz pebble with a conchoidal chip
Silicon dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Granite
Felsic intrusive igneous rock
igneous
Fossilized Gastropod / Coral
Phylum Mollusca / Cnidaria (Silicified or Calcified)
fossil
White Quartz (Tumbled/Waterworn)
Silicon Dioxide (SiO2)
mineral
Granite
Intrusive igneous rock
igneous
Sandstone
Sedimentary Rock (Quartz Sandstone)
sedimentary
White Quartz
Silicon Dioxide (SiO2)
mineral
Heart-shaped Pebble (Limestone/Quartz)
Calcium Carbonate (CaCO3) / Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Perforated sedimentary rock (typically limestone, sandstone, or flint)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Hag Stone
Perforated Quartz Pebble / Sedimentary Rock
sedimentary
Porphyry
Porphyritic Igneous Rock
igneous
Tektite
Natural Impact Glass
meteorite
Granite
Felsic intrusive igneous rock
igneous
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Eye Agate
Chalcedony (SiO2)
sedimentary
Peridotite
Ultramafic igneous rock
igneous
River Pebble
Polished Quartzite or Mixed Lithology
sedimentary
Granite
Felsic intrusive igneous rock
igneous
Agate in Matrix
Silicon Dioxide (SiO2) within host rock
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Scoria
Extrusive Igneous Rock
igneous