Milky Quartz Pebble

Silicon Dioxide (SiO2)

mineral

Porphyry (likely Porphyritic Andesite or Basalt)

Porphyritic Igneous Rock

igneous

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Coquina or Fossilized Shell Aggregate

Calcareous bioclastic sedimentary rock (CaCO3)

sedimentary

Vesicular Basalt with Quartz

Vesicular Basalt (SiO2 inclusions)

igneous

Coquina

Biogenic Limestone

sedimentary

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

sedimentary

Vesicular Basalt

Mafic Igneous Rock

igneous

Sandstone (Pebble)

Arenite (primarily SiO2)

sedimentary

Quartzite Breccia

Brecciated Quartzite (SiO2)

metamorphic

Fossilized Coral

Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)

sedimentary

Quartz (Yellow/Citrine variety)

Crystalline Silicon Dioxide (SiO2)

mineral

Basalt (Beach Pebble)

Extrusive mafic volcanic rock

igneous

Megalodon Shark Tooth Fossil

Otodus megalodon

sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary

Larimar

Pectolite (NaCa2Si3O8(OH))

mineral

Smoky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

mineral

Quartzite

Quartzite (SiO2)

metamorphic

Quartzite

Quartzite (SiO2)

metamorphic

Quartz (Rose or Clear variety)

Silicon Dioxide (SiO2)

mineral

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Calcite

Calcium Carbonate (CaCO3)

mineral

Jasper with Chalcedony

Silicon Dioxide (SiO2)

mineral

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

igneous

Granite

Granite (Phaneritic Quartz-Feldspar Igneous Rock)

igneous

Granite Cobble

Granite

igneous

Basalt with Plagioclase Phenocrysts

Porphyritic Basalt

igneous

Chert (Jasper/Agate variety)

Silicon Dioxide (SiO2)

sedimentary

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

sedimentary

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

mineral

Dragon Blood Jasper

Epidote with Red Jasper (SiO2 + Ca2(Al,Fe)3(SiO4)3(OH))

mineral

Vesicular Basalt (Lava Rock)

Basalt with vesicular texture

igneous

Petrified Wood

Silicified Wood (SiO2)

sedimentary

Quartzite and Jasper Pebbles

Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)

metamorphic

Sandstone

Arenite (composed primarily of Quartz, SiO2)

sedimentary

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

sedimentary

Bismuth Crystal

Bismuth (Bi)

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Halite (Rock Salt)

Halite (Sodium Chloride, NaCl)

mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral