Rock Identifier

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Common Opal

Common Opal

Mudstone

Mudstone

Green Beryl

Green Beryl

Matte Obsidian

Sapphire

Sapphire

Hornfels

Hornfels

Argillite

Argillite

Amethyst and Green Aventurine (Tumbled Gemstones set in a wand) (Quartz (SiO2) varieties - Amethyst and Aventurine) — gemstone

Amethyst and Green Aventurine (Tumbled Gemstones set in a wand)

Quartz (SiO2) varieties - Amethyst and Aventurine

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Smoky Quartz with possible inclusion (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz with possible inclusion

Silicon Dioxide (SiO2)

mineral
Moss Agate (Chalcedony (SiO2) with inclusions of hornblende or chlorite) — mineral

Moss Agate

Chalcedony (SiO2) with inclusions of hornblende or chlorite

mineral
Citrine Quartz (Macrocrystalline Quartz (SiO2)) — mineral

Citrine Quartz

Macrocrystalline Quartz (SiO2)

mineral
Tiger's Eye (Pseudomorph of Quartz after Crocidolite (SiO2)) — metamorphic

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

metamorphic
Banded Agate (Silicon Dioxide (SiO2)) — mineral

Banded Agate

Silicon Dioxide (SiO2)

mineral
Chert (Yellow Jasper/Common Opal variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper/Common Opal variety)

Microcrystalline Quartz (SiO2)

sedimentary
Petrified Wood (Silicified Wood (primarily Chalcedony/Quartz, SiO2)) — fossil

Petrified Wood

Silicified Wood (primarily Chalcedony/Quartz, SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Quartzite with Iron Staining (Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 trace)) — metamorphic

Quartzite with Iron Staining

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3 trace)

metamorphic
Chert (River Pebble) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (River Pebble)

Microcrystalline Quartz (SiO2)

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

Chert Nodule

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Flint with Chalk/Calcite) (Sedimentary cryptocrystalline quartz (SiO2)) — sedimentary

Chert (Flint with Chalk/Calcite)

Sedimentary cryptocrystalline quartz (SiO2)

sedimentary
Red Agate (Carnelian) (Silicon Dioxide (SiO2)) — gemstone

Red Agate (Carnelian)

Silicon Dioxide (SiO2)

gemstone
Chert (Polished/Worn) (Microcrystalline quartz (SiO2)) — sedimentary

Chert (Polished/Worn)

Microcrystalline quartz (SiO2)

sedimentary
Basalt (Basalt) — igneous

Basalt

Basalt

igneous
Red Agate / Carnelian (Silicon Dioxide (SiO2)) — mineral

Red Agate / Carnelian

Silicon Dioxide (SiO2)

mineral
Quartzite (Metamorphosed Quartz Sandstone (SiO2)) — metamorphic

Quartzite

Metamorphosed Quartz Sandstone (SiO2)

metamorphic
Milky Quartz (Silicon dioxide (SiO2)) — mineral

Milky Quartz

Silicon dioxide (SiO2)

mineral
Sandstone (Arenite (SiO2 composition primarily)) — sedimentary

Sandstone

Arenite (SiO2 composition primarily)

sedimentary
Rose Quartz (Frosted Beads) (Silicon Dioxide (SiO2)) — mineral

Rose Quartz (Frosted Beads)

Silicon Dioxide (SiO2)

mineral
Amethyst (Silicon dioxide with iron impurities (SiO2 + Fe3+)) — mineral

Amethyst

Silicon dioxide with iron impurities (SiO2 + Fe3+)

mineral
Granic Pegmatite (Quartz and Feldspar) (Crystalline Quartz (SiO2) and Plagioclase Feldspar (NaAlSi3O8 – CaAl2Si2O8)) — igneous

Granic Pegmatite (Quartz and Feldspar)

Crystalline Quartz (SiO2) and Plagioclase Feldspar (NaAlSi3O8 – CaAl2Si2O8)

igneous
Limestone (Sedimentary Calcium Carbonate (CaCO3)) — sedimentary

Limestone

Sedimentary Calcium Carbonate (CaCO3)

sedimentary
Yellow Quartzite Pebble (Quartzite (primarily SiO2)) — metamorphic

Yellow Quartzite Pebble

Quartzite (primarily SiO2)

metamorphic
Chert / Flint Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Chert / Flint Jasper

Microcrystalline Quartz (SiO2)

sedimentary
Agate Geode with Quartz (Silicon Dioxide (SiO2)) — mineral

Agate Geode with Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

Chert (Yellow Jasper/Flint)

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Rose Quartz

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Quartzite Pebble (Metamorphic rock primarily composed of Quartz (SiO2)) — metamorphic

Quartzite Pebble

Metamorphic rock primarily composed of Quartz (SiO2)

metamorphic
Milky Quartz with Algae/Chlorite (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Algae/Chlorite

Silicon Dioxide (SiO2)

mineral
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
Conglomerate (Polymictic Conglomerate) — sedimentary

Conglomerate

Polymictic Conglomerate

sedimentary
Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

metamorphic
Sapphire (Corundum (Al2O3)) — gemstone

Sapphire

Corundum (Al2O3)

gemstone