Rock Identifier

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Common Opal

Common Opal

Mudstone

Mudstone

Green Beryl

Green Beryl

Matte Obsidian

Sapphire

Sapphire

Hornfels

Hornfels

Argillite

Argillite

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Amethyst Quartz

Silicon Dioxide (SiO2) with iron impurities

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

Clear Quartz

Silicon Dioxide (SiO2)

mineral
Hematitic Sandstone (Sandstone with Hematite inclusions (SiO2 + Fe2O3)) — sedimentary

Hematitic Sandstone

Sandstone with Hematite inclusions (SiO2 + Fe2O3)

sedimentary
Amethyst on Agate (Crystalline Quartz (SiO2) with trace Iron (Fe3+)) — mineral

Amethyst on Agate

Crystalline Quartz (SiO2) with trace Iron (Fe3+)

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

Quartzite

Quartzite (composed primarily of SiO2)

metamorphic
Basalt (Extrusive mafic igneous rock) — igneous

Basalt

Extrusive mafic igneous rock

igneous
Carnelian (Chalcedony) (Silicon Dioxide (SiO2) - variety of Chalcedony) — mineral

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral
Red Sandstone (Ferruginous Sandstone (SiO2 with Iron Oxide)) — sedimentary

Red Sandstone

Ferruginous Sandstone (SiO2 with Iron Oxide)

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

Rose Quartz

Silicon Dioxide (SiO2)

mineral
Chert Geode Nodules (Microcrystalline Quartz (SiO2)) — sedimentary

Chert Geode Nodules

Microcrystalline Quartz (SiO2)

sedimentary
Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

sedimentary
Sandstone (with Iron Staining) (Arenite) — sedimentary

Sandstone (with Iron Staining)

Arenite

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Zebra Jasper (Silicon Dioxide (SiO2)) — metamorphic

Zebra Jasper

Silicon Dioxide (SiO2)

metamorphic
Amethyst (Silicon Dioxide (SiO2)) — mineral

Amethyst

Silicon Dioxide (SiO2)

mineral
Orbicular Jasper (Ocean Jasper) (Silicon Dioxide (SiO2) with various inclusions) — mineral

Orbicular Jasper (Ocean Jasper)

Silicon Dioxide (SiO2) with various inclusions

mineral
Banded Agate (Chalcedony (Silicon Dioxide, SiO2)) — mineral

Banded Agate

Chalcedony (Silicon Dioxide, SiO2)

mineral
Carnelian (Cryptocrystalline Quartz (SiO2 with Hematite impurities)) — mineralish (variety of chalcedony)

Carnelian

Cryptocrystalline Quartz (SiO2 with Hematite impurities)

mineralish (variety of chalcedony)
Milky Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

mineral
Sandstone Pebble (River Rock) (Arenite (primarily SiO2)) — sedimentary

Sandstone Pebble (River Rock)

Arenite (primarily SiO2)

sedimentary
Lake Superior Agate (Chalcedony (SiO2) with iron inclusions) — mineral

Lake Superior Agate

Chalcedony (SiO2) with iron inclusions

mineral
Lake Superior Agate (Silicon Dioxide (SiO2) with impurities) — mineral

Lake Superior Agate

Silicon Dioxide (SiO2) with impurities

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

Chert (Flint/Jasper variety)

Microcrystalline quartz (SiO2)

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

Chert (Jasper)

Silicon Dioxide (SiO2)

sedimentary
Chert (Flint) (Chert (Microcrystalline Silica, SiO2)) — sedimentary

Chert (Flint)

Chert (Microcrystalline Silica, SiO2)

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

Chert / Flint

SiO2 (Silicon Dioxide)

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 (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral
Fossiliferous Limestone (Biogenic Limestone (Calcium Carbonate, CaCO3)) — sedimentary

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

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

Chert (Nodular Chert)

Silicon Dioxide (SiO2)

sedimentary
Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

mineral
Aventurine (Aventurine Quartz (SiO2)) — mineral

Aventurine

Aventurine Quartz (SiO2)

mineral
Basalt Pebble (Aphanitic Mafic Igneous Rock) — igneous

Basalt Pebble

Aphanitic Mafic Igneous Rock

igneous
Leopard Skin Jasper (Rhyolite (Silicon Dioxide - SiO2 with impurities)) — sedimentary

Leopard Skin Jasper

Rhyolite (Silicon Dioxide - SiO2 with impurities)

sedimentary
Amber (Succinite (approximate formula C10H16O)) — mineral

Amber

Succinite (approximate formula C10H16O)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

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

Carnelian

Carnelian (Silicon Dioxide, SiO2)

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

Milky Quartz

Silicon Dioxide (SiO2)

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

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

sedimentary