Chert (Jasper/Flint variant) rock specimen

Chert (Jasper/Flint variant)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Basalt (Weathered/Tumbled) rock specimen

Basalt (Weathered/Tumbled)

Extrusive Mafic Igneous Rock

igneous

Sandstone (Weathered Pebble) rock specimen

Sandstone (Weathered Pebble)

Arenite (composed primarily of SiO2)

sedimentary

Basalt rock specimen

Basalt

Basalt (Mafic volcanic rock)

igneous

Quartzite (River Pebble) rock specimen

Quartzite (River Pebble)

Quartzite (SiO2)

metamorphic

Granite Cobble rock specimen

Granite Cobble

Granite (Felsic Intrusive)

igneous

Sandstone rock specimen

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Granite rock specimen

Granite

Phaneritic Plutonic Igneous Rock (Rich in SiO2)

igneous

Diamond (Emerald Cut) rock specimen

Diamond (Emerald Cut)

Carbon (C)

mineral

Sandstone (with Lichen) rock specimen

Sandstone (with Lichen)

Arenite (primarily SiO2)

sedimentary

Tektite (Indochinite) rock specimen

Tektite (Indochinite)

Tektite (Lechatelierite-rich silica glass)

Mineral-like (Natural Glass)

Coquina (Hag Stone variant) rock specimen

Coquina (Hag Stone variant)

Biocalcarenite (Coquina)

sedimentary

Fossilized Shark Tooth rock specimen

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

sedimentary

Chert (variously Flint) rock specimen

Chert (variously Flint)

Chert (Microcrystalline or cryptocrystalline Quartz, SiO₂)

sedimentary

Belemnite Fossil (Guard) rock specimen

Belemnite Fossil (Guard)

Belemnoidea (Carbonate/Calcite replacement)

sedimentary

Tiger's Eye rock specimen

Tiger's Eye

Titanium-containing Quartz (Silica: SiO2)

Mineral

Septarian Nodule rock specimen

Septarian Nodule

Septarian concretion (Complex mixture of Siderite/Limestone, Calcite, and Aragonite)

sedimentary

Pumice rock specimen

Pumice

Pumice (Vesicular volcanic glass)

igneous

White Topaz rock specimen

White Topaz

Al2SiO4(F,OH)2

mineral

Sandstone rock specimen

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Banded Chert (Jasper) rock specimen

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

sedimentary

Banded Sandstone (Wonderstone) rock specimen

Banded Sandstone (Wonderstone)

Sandstone with Liesegang Rings (SiO2 with Iron Oxides)

sedimentary

Chert (Beach Pebble) rock specimen

Chert (Beach Pebble)

Silicon Dioxide (SiO2)

sedimentary

Amygdaloidal Basalt rock specimen

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock)

Igneous

Chalcedony (Smoky Quartz or Agate nodule fragment) rock specimen

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

mineral

Jasper rock specimen

Jasper

Silicon Dioxide (SiO2) - Opaque Chalcedony

sedimentary

Greenschist rock specimen

Greenschist

Greenschist (Chlorite Schist)

metamorphic

Ironstone (with Limonite/Goethite) rock specimen

Ironstone (with Limonite/Goethite)

Ferruginous Sedimentary Rock (contains Limonite FeO(OH)·nH2O and Hematite Fe2O3)

sedimentary

Chert (Yellow Jasper variant) rock specimen

Chert (Yellow Jasper variant)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Hag Stone rock specimen

Hag Stone

Perforated Chert (Microcrystalline Silica, SiO2)

sedimentary

Limonite (Ironstone) rock specimen

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

mineral

Druzy Quartz on Chert/Siltstone rock specimen

Druzy Quartz on Chert/Siltstone

Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix

sedimentary

Milky Quartz rock specimen

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Cubic Zirconia (Simulated Diamond) rock specimen

Cubic Zirconia (Simulated Diamond)

Zirconium dioxide (ZrO2)

mineral

Chert (River Pebble) rock specimen

Chert (River Pebble)

Microcrystalline quartz (SiO2)

sedimentary

Cubic Zirconia (Faceted) rock specimen

Cubic Zirconia (Faceted)

Zirconium dioxide (ZrO2)

mineral

Jasper (Banded Jasper) rock specimen

Jasper (Banded Jasper)

Silicon Dioxide (SiO2) with impurities

sedimentary

Quartz Pebble (Chert/Chalcedony variety) rock specimen

Quartz Pebble (Chert/Chalcedony variety)

Silicon Dioxide (SiO2)

sedimentary

Jasper rock specimen

Jasper

Silicon dioxide (SiO2)

sedimentary

River Pebble (Likely Quartzite or Chert) rock specimen

River Pebble (Likely Quartzite or Chert)

Quartzite (primarily SiO2)

metamorphic

Diamond (or Diamond Simulant) rock specimen

Diamond (or Diamond Simulant)

Carbon (C)

mineral

Prasiolite rock specimen

Prasiolite

Silicon Dioxide (SiO2) with iron impurities

mineral