Rock Identifier

Category

Sedimentary (Volcanic)

Browse sedimentary (volcanic) specimens identified by the Rock Identifier community.

Learn about Sedimentary (Volcanic) in the encyclopedia

Conglomerate

Quartzite Sandstone

Quartzite Sandstone

Andesite

Pink Obsidian

Breccia

Ironstone

Scoria

Yellow Obsidian

Yellow Obsidian

Black Obsidian

Green Sheen Obsidian

Turquoise Obsidian

Teal Obsidian

Red Jasper (Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Yellow Jasper (Silicon dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Geode (Unopened) (Silica-rich concretion (SiO2)) — sedimentary

Geode (Unopened)

Silica-rich concretion (SiO2)

Bumblebee Jasper (Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)) — sedimentary

Bumblebee Jasper

Anhydrite with Sulfur, Hematite, and Orpiment (SiO2/CaSO4 mixture)

Tumbled yellow jasper or chert (Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert) — mineral

Tumbled yellow jasper or chert

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chalcedony/chert

Quartz Pebble (Chalcedony / River Pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Chalcedony / River Pebble)

Silicon Dioxide (SiO2)

Black Onyx (Cryptocrystalline quartz (SiO2)) — gemstone

Black Onyx

Cryptocrystalline quartz (SiO2)

Small weathered rock fragment (Indeterminate; possibly limestone or altered volcanic rock) — sedimentary

Small weathered rock fragment

Indeterminate; possibly limestone or altered volcanic rock

Jasper or Agate (Chalcedony (SiO2)) — mineral

Jasper or Agate

Chalcedony (SiO2)

Banded Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Agate (Carnelian type) (Silicon Dioxide (SiO2)) — mineral

Agate (Carnelian type)

Silicon Dioxide (SiO2)

Amethyst Geode Fragment (Quartz (SiO2) with trace iron impurities) — mineral

Amethyst Geode Fragment

Quartz (SiO2) with trace iron impurities

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Agate Nodule (Chalcedony (SiO2)) — sedimentary

Agate Nodule

Chalcedony (SiO2)

Agate Nodule (Silicon dioxide (Chalcedony/Quartz), SiO2) — sedimentary

Agate Nodule

Silicon dioxide (Chalcedony/Quartz), SiO2

Blue Chalcedony (Moonstone-like / Agate) (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — gemstone

Blue Chalcedony (Moonstone-like / Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Banded Agate (Silicon Dioxide (SiO2)) — mineral

Banded Agate

Silicon Dioxide (SiO2)

Green Jasper (Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions) — sedimentary

Green Jasper

Quartz (Silicon Dioxide, SiO2) with iron silicate inclusions

Chalcedony (Carnelian/Agate) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Carnelian/Agate)

Silicon Dioxide (SiO2)

Jasper (Cryptocrystalline Quartz (SiO2)) — sedimentary

Jasper

Cryptocrystalline Quartz (SiO2)

Yellow Chalcedony (Carnelian / Agate Pebbles) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Carnelian / Agate Pebbles)

Silicon Dioxide (SiO2)

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

Agate (Chalcedony Nodule)

Silicon Dioxide (SiO2)

Rough Chalcedony / Jasper Nodules (Silicon Dioxide (SiO2)) — mineral

Rough Chalcedony / Jasper Nodules

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Eye Agate (Chalcedony (SiO2)) — sedimentary

Eye Agate

Chalcedony (SiO2)

Agate (Silicon Dioxide (Chalcedony), SiO2) — sedimentary

Agate

Silicon Dioxide (Chalcedony), SiO2

Black Onyx (Chalcedony (SiO2)) — gemstone

Black Onyx

Chalcedony (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Chalcedony (Agate/Jasper Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chalcedony (Agate/Jasper Nodule)

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Mixed Gemstone and Mineral Collection (Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)) — mineral

Mixed Gemstone and Mineral Collection

Mixed Silica and Carbonate minerals (SiO2, CaSO4·2H2O, etc.)

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

Yellow Chalcedony (Agate)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2)) — mineral

Jasper

Silicon Dioxide (SiO2)

Chalcedony (Chalcedony (SiO2)) — mineral

Chalcedony

Chalcedony (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode (Quartz (Silicon Dioxide, SiO2) in a Geode) — sedimentary

Quartz Geode

Quartz (Silicon Dioxide, SiO2) in a Geode

Turquoise (Turquoise, CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Turquoise, CuAl6(PO4)4(OH)8·4H2O

Tumbled carnelian (orange chalcedony) (Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides) — mineral

Tumbled carnelian (orange chalcedony)

Carnelian, a microcrystalline variety of quartz; silicon dioxide (SiO₂) colored mainly by iron oxides

Conglomeratic or porphyritic basalt cobble (Likely vesicular basalt with weathered feldspar/mafic inclusions; exact identification requires testing) — igneous

Conglomeratic or porphyritic basalt cobble

Likely vesicular basalt with weathered feldspar/mafic inclusions; exact identification requires testing