Chert (Jasper/Common Opal mix) rock specimen

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

sedimentary

Chert (Nodule) rock specimen

Chert (Nodule)

Microcrystalline Quartz (SiO2)

sedimentary

Amber Chert (Jasper) rock specimen

Amber Chert (Jasper)

Microcrystalline Quartz (SiO2)

sedimentary

Chert / Flint Nodules rock specimen

Chert / Flint Nodules

Chert (Cryptocrystalline variety of Quartz, SiO2)

sedimentary

Chert (Nodule) rock specimen

Chert (Nodule)

Microcrystalline Quartz (SiO2)

sedimentary

Amethyst rock specimen

Amethyst

Amethyst (variety of Quartz, SiO2)

mineral

Mystic Topaz rock specimen

Mystic Topaz

Aluminum silicate fluoride hydroxide with titanium coating (Al2SiO4(F,OH)2)

mineral

Chert (includes Flint & Jasper) rock specimen

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

sedimentary

Diorite rock specimen

Diorite

Diorite (Intermediate intrusive igneous rock)

igneous

Asphalt (Bituminous Pavement) rock specimen

Asphalt (Bituminous Pavement)

Bituminous mix (Aggregates with Bitumen binder)

sedimentary

Prasiolite rock specimen

Prasiolite

Silicon Dioxide (SiO2)

mineral

Conglomerate rock specimen

Conglomerate

Conglomerate (SiO2 matrix with various silicate clasts)

sedimentary

Sandstone (Quartz Arenite) rock specimen

Sandstone (Quartz Arenite)

Clastic Sedimentary Rock - Quartz Arenite

sedimentary

Red Jasper rock specimen

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

sedimentary

Selenite (Satin Spar Gypsum) rock specimen

Selenite (Satin Spar Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

mineral

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Silicon Dioxide (SiO2)

sedimentary

Graphic Granite rock specimen

Graphic Granite

Graphic Pegmatite

igneous

Petoskey Stone (Coral Fossil) rock specimen

Petoskey Stone (Coral Fossil)

Hexagonaria percarinata (Fossilized colonial rugose coral)

sedimentary

Sandstone rock specimen

Sandstone

Clastic sedimentary rock (primarily SiO2)

sedimentary

Nephrite Jade rock specimen

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

metamorphic

Diabase (Dolerite) Cobble rock specimen

Diabase (Dolerite) Cobble

Diabase / Dolerite

igneous

Sandstone (likely Fossiliferous) rock specimen

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

sedimentary

Serpentine (Nephrite-like Serpentine) rock specimen

Serpentine (Nephrite-like Serpentine)

Serpentinite (Hydrous magnesium iron phyllosilicate)

metamorphic

Sandstone rock specimen

Sandstone

Arenite (SiO2 based)

sedimentary

Sandstone (likely Red/Brown Sandstone) rock specimen

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

sedimentary

Red Jasper with Quartz and Hematite rock specimen

Red Jasper with Quartz and Hematite

Silicon Dioxide (SiO2) with Ferric Iron inclusions

sedimentary

Granite rock specimen

Granite

Granitoid

igneous

Chert (specifically a Chert Nodule or Flint) rock specimen

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

sedimentary

Quartzite (River Cobble) rock specimen

Quartzite (River Cobble)

Quartzite (SiO2)

metamorphic

Chert (often called Flint when dark) rock specimen

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

sedimentary

Petrified Wood rock specimen

Petrified Wood

Silicified Wood (SiO2)

metamorphic

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Silicon Dioxide (SiO2)

sedimentary

Quartzite Pebble rock specimen

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

metamorphic

Chert (Jasper variety) rock specimen

Chert (Jasper variety)

Silicon dioxide (SiO2) - Microcrystalline Quartz

sedimentary

Chalcedony (Agate/Carnelian variant) rock specimen

Chalcedony (Agate/Carnelian variant)

Silicon Dioxide (SiO2)

mineral

Yellow Quartz (Citrine Quartz or Yellow Chalcedony) rock specimen

Yellow Quartz (Citrine Quartz or Yellow Chalcedony)

Silicon Dioxide (SiO2)

mineral

Yellow Jasper rock specimen

Yellow Jasper

Silicon Dioxide (SiO2) - Impure Cryptocrystalline Quartz

sedimentary

Chert (Flint) rock specimen

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

sedimentary

Pink Granite rock specimen

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-feldspar, Quartz, and Biotite)

igneous

Quartzite Pebble (with Iron Inclusions) rock specimen

Quartzite Pebble (with Iron Inclusions)

Quartzite (primarily SiO2 with Fe2O3/FeOOH impurities)

metamorphic

Quartzite Pebble rock specimen

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

metamorphic

Carnelian (Chalcedony) rock specimen

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with Iron Oxide impurities

mineral