Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Chert Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

Quartz Geode Fragment (Silicon dioxide (SiO2) within a nodule) — sedimentary

Quartz Geode Fragment

Silicon dioxide (SiO2) within a nodule

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Chert (potentially worked flint) (Cryptocrystalline microcrystalline quartz (SiO2)) — sedimentary

Chert (potentially worked flint)

Cryptocrystalline microcrystalline quartz (SiO2)

Chert (Pink/Tan variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Pink/Tan variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

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

Banded Chert

Chert (Microcrystalline Quartz, SiO2)

Chalk (CaCO3 (Calcium Carbonate)) — sedimentary

Chalk

CaCO3 (Calcium Carbonate)

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Quartzite river stone (Quartzite (SiO2)) — metamorphic

Quartzite river stone

Quartzite (SiO2)

Tangerine Quartz (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — mineral

Tangerine Quartz

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Agate (Silicon dioxide (Chalcedony), SiO2) — gemstone

Agate

Silicon dioxide (Chalcedony), SiO2

Dyed Pink Quartzite Beads (Recrystallized Silicon Dioxide (SiO2) with dye) — metamorphic

Dyed Pink Quartzite Beads

Recrystallized Silicon Dioxide (SiO2) with dye

Chert Nodules with Iron Staining (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodules with Iron Staining

Microcrystalline Quartz (SiO2)

Sandstone (with Chert/Quartzite nodules) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (with Chert/Quartzite nodules)

Clastic sedimentary rock (primarily SiO2)

Laterite (Red Clay) (Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)) — sedimentary

Laterite (Red Clay)

Laterite (Fe2O3 · nH2O and Al2O3 · nH2O)

Chert / Flint (Silicon dioxide (SiO2)) — sedimentary

Chert / Flint

Silicon dioxide (SiO2)

Dyed Agate Slice (Silicon Dioxide (SiO2) with artificial dyes) — mineral

Dyed Agate Slice

Silicon Dioxide (SiO2) with artificial dyes

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Green Aventurine (Aventurine Quartz (SiO2 with Fuchsite inclusions)) — metamorphic

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Seashell Fragment (Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite) — mineral

Seashell Fragment

Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Chert (Yellow Jasper) (Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Cryptocrystalline Quartz (SiO2)

Chert (Common Opal/Agate variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Common Opal/Agate variety)

Microcrystalline Quartz (SiO2)

Ferruginous Sandstone (River Pebble) (Clastic Sedimentary Rock (Iron-rich)) — sedimentary

Ferruginous Sandstone (River Pebble)

Clastic Sedimentary Rock (Iron-rich)

Clay Brick (Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)) — metamorphic (man-made/anthropogenic)

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

metamorphic (man-made/anthropogenic)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Gold (Native Gold (Au)) — Mineral

Gold

Native Gold (Au)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Limestone Pebble (Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Limestone Pebble

Limestone (Calcium Carbonate, CaCO3)

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

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Aventurine (Aventurine (Silicon Dioxide with Fuchsite inclusions) - SiO2) — mineral

Aventurine

Aventurine (Silicon Dioxide with Fuchsite inclusions) - SiO2

Quartz (Druzy/Macro-crystalline) (Silicon Dioxide (SiO2)) — mineral

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

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

Amethyst

Quartz (Silicon Dioxide with iron impurities), SiO2

Pink Tumbled Agate (Silicon Dioxide (SiO2) with dye) — mineral

Pink Tumbled Agate

Silicon Dioxide (SiO2) with dye

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

Quartz (Grain)

Silicon Dioxide (SiO2)

Aura Quartz (Titanium or Gold bonded Silicon Dioxide (SiO2)) — mineral

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Gold (Native Gold (Au)) — mineral

Gold

Native Gold (Au)

Amethyst (Silicon dioxide (SiO2)) — mineral

Amethyst

Silicon dioxide (SiO2)