Rock Identifier

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Common Opal

Common Opal

Mudstone

Mudstone

Green Beryl

Green Beryl

Matte Obsidian

Sapphire

Sapphire

Hornfels

Hornfels

Argillite

Argillite

Quartzite (Quartzite) — metamorphic

Quartzite

Quartzite

metamorphic
Agate (Chalcedony (SiO2)) — mineral

Agate

Chalcedony (SiO2)

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

Clear Quartz (Faceted)

SiO2 - Silicon Dioxide

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

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

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

Chert (Flint) Artifact

Silicon Dioxide (SiO2)

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

Chert (or Flint)

SiO2 (Microcrystalline Quartz)

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

Chert Arrowhead

Cryptocrystalline Quartz (SiO2)

sedimentary
Sandstone (Ferruginous) (Arenite with Iron Oxide cement) — sedimentary

Sandstone (Ferruginous)

Arenite with Iron Oxide cement

sedimentary
Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

mineral
Clear Quartz (Cut/Faceted Gemstone) (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Cut/Faceted Gemstone)

Silicon Dioxide (SiO2)

gemstone
Jasper Pendant (Chalcedony (Quartz) - SiO2) — Mineral/Sedimentary

Jasper Pendant

Chalcedony (Quartz) - SiO2

Mineral/Sedimentary
Weathered volcanic rock, likely andesite (Andesite (plagioclase–pyroxene volcanic rock), identification tentative) — igneous

Weathered volcanic rock, likely andesite

Andesite (plagioclase–pyroxene volcanic rock), identification tentative

igneous
Specular Hematite (Specularite) (Iron Oxide (Fe2O3)) — mineral

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

mineral
Chert (Silicon dioxide (SiO2)) — sedimentary

Chert

Silicon dioxide (SiO2)

sedimentary
Quartzite pebble (Quartzite) — metamorphic

Quartzite pebble

Quartzite

metamorphic
Rose Quartz (Silicon dioxide, SiO2) — mineral

Rose Quartz

Silicon dioxide, SiO2

mineral
Blue Lace Agate (Silicon Dioxide (SiO2) with inclusions) — mineral

Blue Lace Agate

Silicon Dioxide (SiO2) with inclusions

mineral
Sandstone (Quartzose) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Clastic sedimentary rock (primarily SiO2)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

metamorphic
Banded Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

sedimentary
Fossil Coral (Silicified) (Anthozoa (Silicified Scleractinia or Tabulata)) — fossil

Fossil Coral (Silicified)

Anthozoa (Silicified Scleractinia or Tabulata)

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

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

metamorphic
Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

mineral
Quartz (Milky/Smoky mix) (Silicon Dioxide (SiO2)) — mineral

Quartz (Milky/Smoky mix)

Silicon Dioxide (SiO2)

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

Rose Quartz

Silicon Dioxide (SiO2)

mineral
Chalcedony (Jasper/Agate mix) (Quartz (microcrystalline SiO2)) — sedimentary

Chalcedony (Jasper/Agate mix)

Quartz (microcrystalline SiO2)

sedimentary
Quartzite pebble (Quartzite (primarily SiO2)) — metamorphic

Quartzite pebble

Quartzite (primarily SiO2)

metamorphic
Sandstone with Iron Staining (Arenite (SiO2 with FeO(OH) impurities)) — sedimentary

Sandstone with Iron Staining

Arenite (SiO2 with FeO(OH) impurities)

sedimentary
Quartzite (Ferruginous Quartz) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — metamorphic

Quartzite (Ferruginous Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

metamorphic
Red Aventurine (Quartz containing Hematite or Goethite (SiO2)) — mineral

Red Aventurine

Quartz containing Hematite or Goethite (SiO2)

mineral
Chert / Flint Pebble with Fossil Cavity (Silicon Dioxide (SiO2)) — sedimentary

Chert / Flint Pebble with Fossil Cavity

Silicon Dioxide (SiO2)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Quartzite Pebble (Quartzite (SiO2 silicon dioxide)) — metamorphic

Quartzite Pebble

Quartzite (SiO2 silicon dioxide)

metamorphic
Limonite (Iron Ore) (Limonite (FeO(OH)·nH2O)) — mineral

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

mineral
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary
Chert (variously Flints) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (variously Flints)

Microcrystalline Quartz (SiO2)

sedimentary
Quartzite with Quartz Veining (Quartzite (SiO2)) — metamorphic

Quartzite with Quartz Veining

Quartzite (SiO2)

metamorphic
Picture Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with impurities

sedimentary
Riverstone Jasper (Silicon Dioxide (SiO2) with impurities) — sedimentary

Riverstone Jasper

Silicon Dioxide (SiO2) with impurities

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

Milky Quartz

Silicon Dioxide (SiO2)

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

Chert

Chert (Microcrystalline Quartz, SiO2)

sedimentary