Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Pink Quartz (Silicon Dioxide (Quartz), SiO2) — mineral

Pink Quartz

Silicon Dioxide (Quartz), SiO2

Yellow Agate (Silicon Dioxide (Chalcedony), SiO2) — gemstone

Yellow Agate

Silicon Dioxide (Chalcedony), SiO2

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Clear Quartz (Faceted) (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2 with iron impurities)

Quartzite Pepple (Quartzite (SiO2)) — metamorphic

Quartzite Pepple

Quartzite (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz (Rock Crystal) (Silicon Dioxide (SiO2)) — mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Green Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Green Chert

Microcrystalline Quartz (SiO2)

Thunder Egg (Agate/Jasper filled) (Chalcedony variety Agate/Jasper in a Rhyolitic matrix) — sedimentary

Thunder Egg (Agate/Jasper filled)

Chalcedony variety Agate/Jasper in a Rhyolitic matrix

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)

Quartzite River Stone (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Stone

Quartzite (primarily SiO2)

Garnet (Silicate mineral group (often Pyrope or Almandine in this color range)) — gemstone

Garnet

Silicate mineral group (often Pyrope or Almandine in this color range)

Chert (Flint Pebble) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint Pebble)

Cryptocrystalline Quartz (SiO2)

Citrine (Heat-Treated Amethyst) (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2) with ferric iron impurities

Chert (or Chalcedony) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (or Chalcedony)

Microcrystalline Quartz (SiO2)

River Stone (Quartzite/Chert mixture) (Microcrystalline Quartz (SiO2)) — sedimentary

River Stone (Quartzite/Chert mixture)

Microcrystalline Quartz (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Chert (Flint) (Sedimentary Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Sedimentary Cryptocrystalline Quartz (SiO2)

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

Quartz (Chalcedony)

Silicon Dioxide (SiO2)

Rose Quartz (SiO2 (Silicon Dioxide) with traces of titanium, iron, or manganese) — mineral

Rose Quartz

SiO2 (Silicon Dioxide) with traces of titanium, iron, or manganese

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — metamorphic

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Chert (Yellow Jasper/Flint) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

Orange Quartz (Ferruginous Quartz) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — mineral

Orange Quartz (Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Strawberry Quartz (Hematoid Quartz) (Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)) — mineral

Strawberry Quartz (Hematoid Quartz)

Silicon Dioxide with Iron Oxide inclusions (SiO2 + Fe2O3)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — mineral

Quartz on Host Rock

Silicon Dioxide (SiO2)

Quartz Druzy (Geode Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy (Geode Fragment)

Silicon Dioxide (SiO2)

Chert (Hagstone / Lucky Stone) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Hagstone / Lucky Stone)

Microcrystalline Quartz (SiO2)

Gold (Native gold (Au)) — mineral

Gold

Native gold (Au)

River Stone (River Pebble) (Rounded Sedimentary Rock (Lithic Clast)) — sedimentary

River Stone (River Pebble)

Rounded Sedimentary Rock (Lithic Clast)

Citrine (Silicon Dioxide (SiO2)) — gemstone

Citrine

Silicon Dioxide (SiO2)

Hematoid Quartz (Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)) — mineral

Hematoid Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Nugget of Native Silver (Native Silver (Ag)) — mineral

Nugget of Native Silver

Native Silver (Ag)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — gemstone

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

Chert (Yellow Jasper) (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Yellow Jasper)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Chert (Gravel) (Chert (Microcrystalline Silicon Dioxide, SiO2)) — sedimentary

Chert (Gravel)

Chert (Microcrystalline Silicon Dioxide, SiO2)

Quartz (SiO2 (Silicon dioxide)) — mineral

Quartz

SiO2 (Silicon dioxide)

Lake Superior Agate (Chalcedony (Microcrystalline Quartz, SiO2) with iron impurities) — sedimentary

Lake Superior Agate

Chalcedony (Microcrystalline Quartz, SiO2) with iron impurities

Quartzite (Quartzite (mostly SiO2)) — metamorphic

Quartzite

Quartzite (mostly SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)