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 Nodule (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Nodule

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Flint / Chalcedony pebble) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint / Chalcedony pebble)

Silicon Dioxide (SiO2)

sedimentary
Quartz Pebble (Geode Fragment / Druzy Cavity) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Geode Fragment / Druzy Cavity)

Silicon Dioxide (SiO2)

mineral
Quartz Sand Grain / Micro Crystal (Silicon Dioxide (SiO2)) — mineral

Quartz Sand Grain / Micro Crystal

Silicon Dioxide (SiO2)

mineral
Basalt Pebble (Basalt (Mafic Extrusive Igneous Rock)) — igneous

Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

mineral
Quartzite / Quartz Pebble (Quartzite (SiO2)) — metamorphic

Quartzite / Quartz Pebble

Quartzite (SiO2)

metamorphic
Limestone (Calcium carbonate (CaCO3)) — sedimentary

Limestone

Calcium carbonate (CaCO3)

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

Jasper / Chert Pebble

Microcrystalline Quartz (SiO2)

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

Quartz pebble

Silicon Dioxide (SiO2)

mineral
Sandstone Pebble (Arenite (SiO2 dominated with iron oxide)) — sedimentary

Sandstone Pebble

Arenite (SiO2 dominated with iron oxide)

sedimentary
Gray Pebble (Graywacke / Basalt) (Graywacke (or fine-grained Basalt)) — sedimentary

Gray Pebble (Graywacke / Basalt)

Graywacke (or fine-grained Basalt)

sedimentary
Agate and Chalcedony Beads (Cryptocrystalline Quartz (SiO2)) — gemstone

Agate and Chalcedony Beads

Cryptocrystalline Quartz (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert (Jasper/Flint variety) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

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

Hematite

Iron(III) oxide (Fe2O3)

mineral
Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

mineral
Moldavite (Moldavite (Silica Glass with impurities)) — tektite

Moldavite

Moldavite (Silica Glass with impurities)

tektite
Quartz (Tumbled/Water-worn) (Silicon Dioxide (SiO2)) — mineral

Quartz (Tumbled/Water-worn)

Silicon Dioxide (SiO2)

mineral
Petrified Wood (Silicified Wood (SiO2 permineralization)) — fossil

Petrified Wood

Silicified Wood (SiO2 permineralization)

fossil
Quartzite (Quartzite (composed primarily of SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert (Chalcedony/Quartz) (Microcrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert (Chalcedony/Quartz)

Microcrystalline Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

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

Quartz Pebble

Silicon Dioxide (SiO2)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

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

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Chert / Lake Superior Agate (Cryptocrystalline Silicon Dioxide (SiO2)) — sedimentary

Chert / Lake Superior Agate

Cryptocrystalline Silicon Dioxide (SiO2)

sedimentary
Limestone (CaCO3 (Calcium Carbonate)) — sedimentary

Limestone

CaCO3 (Calcium Carbonate)

sedimentary
Sandstone (Iron-stained) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Iron-stained)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

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

Rose Quartz

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

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

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Clear Quartz / Diamond (untested) (Silicon Dioxide (SiO2) or Carbon (C)) — mineral

Clear Quartz / Diamond (untested)

Silicon Dioxide (SiO2) or Carbon (C)

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

Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Quartz Pebble (Beach Agate / Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Beach Agate / Chalcedony)

Silicon Dioxide (SiO2)

mineral
Beach Agate / Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Beach Agate / Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Green Aventurine (Silicon Dioxide with Fuchsite (SiO2)) — mineral

Green Aventurine

Silicon Dioxide with Fuchsite (SiO2)

mineral