Tumbled Agate (Dyed Blue)
Silicon Dioxide (Chalcedony variety)
gemstone
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Witch Stone (Hag Stone)
Perforated Sedimentary Rock (Typically Sandstone or Limestone)
sedimentary
Limestone Pebble
Calcium Carbonate (CaCO3)
sedimentary
Chevron Amethyst
Silicon Dioxide (Quartz variety) - SiO2
mineral
Sandstone Pebble
Sedimentary Rock (Quartzose Sandstone)
sedimentary
Basalt Pebble
Extrusive Igneous Rock
igneous
Petrified Wood
Silicified Wood (SiO2)
fossil
Limestone
Calcium Carbonate (CaCO3)
sedimentary
River Pebble
Siliceous rock fragment / Quartzite / Sandstone pebble
sedimentary
Basalt
Extrusive Igneous Rock
igneous
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Cobalt Blue Glass / Cullet Glass
Silicon dioxide (Amorphous man-made glass)
mineral
Yellow Agate
Silicon Dioxide (SiO2)
gemstone
Crinoid Stem Fossil in Chert
Crinoid columnal ossicles (phylum Echinodermata) embedded in microcrystalline quartz (chert)
fossil
Granite
Intrusive Igneous Rock
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian Agate
Silicon Dioxide (Chalcedony variety), SiO2
gemstone
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Galena with Pyrite
Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)
mineral
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Yellow Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Concrete or artificial stone core sample
Artificial conglomerate
sedimentary
Quartzite
Quartzite (Metamorphosed Quartz Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Quartz with Fuchsite inclusions (SiO2)
mineral
Granite Boulder
Intrusive Igneous Rock
igneous
Granite Boulder
Felsic Intrusive Igneous Rock
igneous
Granite
Intrusive Igneous Rock
igneous
Sandstone or Weathered Conglomerate
Sedimentary Rock (Quartzose Sandstone / Lithic Arenite)
sedimentary
Cannonball Concretion
Calcite-cemented Sandstone Concretion
sedimentary
Quartz-veined Sedimentary Rock
Sedimentary rock with hydrothermal quartz veins
sedimentary
Citrine Quartz (Carved Point)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Rose Quartz or Chert variant)
Silicon Dioxide (SiO2)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
metamorphic
Ferruginous Quartz
Silicon Dioxide with Iron Oxide Inclusions (SiO2)
mineral