Rock Identifier

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Common Opal

Common Opal

Mudstone

Mudstone

Green Beryl

Green Beryl

Matte Obsidian

Sapphire

Sapphire

Hornfels

Hornfels

Argillite

Argillite

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

sedimentary
Quartz Pebble (Crystalline Silica (SiO2)) — mineral

Quartz Pebble

Crystalline Silica (SiO2)

mineral
Citrine or Yellow Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Citrine or Yellow Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Sandstone River Pebble (Arenite (SiO2 based)) — sedimentary

Sandstone River Pebble

Arenite (SiO2 based)

sedimentary
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
River Cobble (Quartzite or Sandstone) (Arenite or Meta-quartzite (SiO2 composition)) — sedimentary

River Cobble (Quartzite or Sandstone)

Arenite or Meta-quartzite (SiO2 composition)

sedimentary
Hematite Nodule (Hematite (Alpha Fe2O3)) — mineral

Hematite Nodule

Hematite (Alpha Fe2O3)

mineral
Citrine Quartz / Iron-stained Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz / Iron-stained Quartz

Silicon Dioxide (SiO2)

mineral
Mocha Stone (Dendritic Agate) (Silicon Dioxide (SiO2) with Manganese/Iron inclusions) — sedimentary

Mocha Stone (Dendritic Agate)

Silicon Dioxide (SiO2) with Manganese/Iron inclusions

sedimentary
Chert Nodules in Limestone (Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)) — sedimentary

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

sedimentary
Quartz Geode (Crystalline Silicon Dioxide (SiO2) in a Geodic Concretion) — mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in a Geodic Concretion

mineral
Riverstone (Sandstone or Quartzite) (Sedimentary Rock (likely Arenite)) — sedimentary

Riverstone (Sandstone or Quartzite)

Sedimentary Rock (likely Arenite)

sedimentary
Quartz Grain (Silicon Dioxide (SiO2)) — mineral

Quartz Grain

Silicon Dioxide (SiO2)

mineral
Aura Quartz (Silicon Dioxide (SiO2) with metallic vapor coating) — mineral

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

mineral
Sandstone (River Pebble) (Clastic Sedimentary Rock (primarily Quartz)) — sedimentary

Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartz)

sedimentary
Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint)

Silicon Dioxide (SiO2)

sedimentary
Amethyst Geode (Amethyst (Silicon Dioxide, SiO2)) — mineral

Amethyst Geode

Amethyst (Silicon Dioxide, SiO2)

mineral
Chert (Black Chert or Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Black Chert or Flint)

Silicon Dioxide (SiO2)

sedimentary
Clear Quartz (Tumbled) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

mineral
Carnelian (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

mineral
Coquina (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

sedimentary
Yellow Jasper (Silicon Dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2)

sedimentary
Chert Arrowhead (Cryptocrystalline microcrystalline Quartz (SiO2)) — sedimentary

Chert Arrowhead

Cryptocrystalline microcrystalline Quartz (SiO2)

sedimentary
Brown Pebble (Probable Chert or Siltstone) (Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz) — sedimentary

Brown Pebble (Probable Chert or Siltstone)

Silicon Dioxide (SiO2) / Sedimentary Microcrystalline Quartz

sedimentary
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert (Flint) (Chert (Silicon Dioxide, SiO2)) — sedimentary

Chert (Flint)

Chert (Silicon Dioxide, SiO2)

sedimentary
Fossil Shark Tooth (Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite) — fossil

Fossil Shark Tooth

Chondrichthyes (class); likely Lamniformes (order) fossilized in Apatite/Hydroxyapatite

fossil
Sandstone (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone

Arenite (composed mainly of SiO2)

sedimentary
Chert (Jasper/Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Chalcedony)

Microcrystalline Quartz (SiO2)

sedimentary
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

sedimentary
Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chalcedony (Carnelian) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Carnelian)

Silicon Dioxide (SiO2)

mineral
Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

mineral
Chert (Arrowhead) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead)

Microcrystalline Quartz (SiO2)

sedimentary
Quartz Nut (SiO2 (Silicon Dioxide)) — mineral health

Quartz Nut

SiO2 (Silicon Dioxide)

mineral health
Milky Quartz Chip (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Chip

Silicon Dioxide (SiO2)

mineral
Chert (Chert (SiO2, Silicon Dioxide)) — sedimentary

Chert

Chert (SiO2, Silicon Dioxide)

sedimentary
Quartz River Pebble (Crystalline Silicon Dioxide (SiO2)) — mineral

Quartz River Pebble

Crystalline Silicon Dioxide (SiO2)

mineral
Strawberry Quartz (Aventurine) (Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)) — mineral

Strawberry Quartz (Aventurine)

Silicon Dioxide with Hematite/Lepidocrocite inclusions (SiO2)

mineral
Sandstone Pebble (Arenite (SiO2 complex)) — sedimentary

Sandstone Pebble

Arenite (SiO2 complex)

sedimentary