Rock Identifier

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Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Chert (Jasper) (Microcrystalline Quartz (SiO2) with iron inclusions) — sedimentary

Chert (Jasper)

Microcrystalline Quartz (SiO2) with iron inclusions

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

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Chert (Microcrystalline Quartz (SiO2) with iron oxide staining) — sedimentary

Chert

Microcrystalline Quartz (SiO2) with iron oxide staining

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

Rose Quartz

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

Chalcedony (Common Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Agate)

Silicon Dioxide (SiO2)

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

Amethyst

Quartz (Silicon Dioxide with Iron impurities), SiO2

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Yellow Jasper (Silicon dioxide (SiO2) with iron oxide impurities) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2) with iron oxide impurities

Banded Sandstone (Clastic Sedimentary Rock (Quartz Arenite)) — sedimentary

Banded Sandstone

Clastic Sedimentary Rock (Quartz Arenite)

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

Chert (and Flint)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Blue Lace Agate (Beads) (Silicon dioxide (SiO2) - Variety of Chalcedony) — gemstone

Blue Lace Agate (Beads)

Silicon dioxide (SiO2) - Variety of Chalcedony

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Rose Quartz (Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese) — gemstone

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese

Milky Quartz with Iron Staining (Crystalline Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Crystalline Silicon Dioxide (SiO2)

White Jade (Nephrite or Jadeite) (Tremolite-Actinolite / Sodium Aluminum Silicate (NaAlSi2O6)) — metamorphic

White Jade (Nephrite or Jadeite)

Tremolite-Actinolite / Sodium Aluminum Silicate (NaAlSi2O6)

Sandstone Pebbles (Arenite (primarily SiO2 with mineral cement)) — sedimentary

Sandstone Pebbles

Arenite (primarily SiO2 with mineral cement)

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

Chert (Flint)

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Chert Pebble (Jasper variety)

Silicon Dioxide (SiO2)

Red Jasper (Jasper (variety of Chalcedony), SiO2) — sedimentary

Red Jasper

Jasper (variety of Chalcedony), SiO2

Dream Amethyst (Chevron Amethyst) (Silicon Dioxide (SiO2) with iron impurities) — gemstone

Dream Amethyst (Chevron Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Green Aventurine (Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)) — mineral

Green Aventurine

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

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

Chert (Flint)

Silicon Dioxide (SiO2)

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

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz (Iron-stained) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Tumbled Gray Agate (Silicon Dioxide (SiO2)) — mineral

Tumbled Gray Agate

Silicon Dioxide (SiO2)

Chert (Flint) (Silicon dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Chert (Flint)

Silicon dioxide (SiO2) - Microcrystalline Quartz

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

Chert (Nodule)

Microcrystalline Quartz (SiO2)

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

Banded Chert / Jasper Cognation (Microcrystalline Quartz (SiO2) with Hematite/Limonite) — sedimentary

Banded Chert / Jasper Cognation

Microcrystalline Quartz (SiO2) with Hematite/Limonite

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Quartz (Clear/Crystalline)

Silicon Dioxide (SiO2)

Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Chert

Microcrystalline Quartz (SiO2)

Yellow Jasper (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chert (Arrowhead Fragment) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Arrowhead Fragment)

Silicon Dioxide (SiO2)

Rose Quartz (Silicon dioxide (SiO2)) — mineral

Rose Quartz

Silicon dioxide (SiO2)

Amethyst (Crystalline Quartz (SiO2 with iron impurities)) — gemstone

Amethyst

Crystalline Quartz (SiO2 with iron impurities)

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

Aventurine (Green Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2)