Rock Identifier

Category

Sedimentary (Volcanic)

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

Learn about Sedimentary (Volcanic) in the encyclopedia

Conglomerate

Andesite

Quartzite Sandstone

Quartzite Sandstone

Pink Obsidian

Breccia

Ironstone

Scoria

Yellow Obsidian

Yellow Obsidian

Black Obsidian

Green Sheen Obsidian

Turquoise Obsidian

Teal Obsidian

Jasper (likely red/brown jasper) (Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides) — mineral

Jasper (likely red/brown jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides

Red jasper (tumbled river pebble) (Jasper, an opaque microcrystalline variety of quartz/chalcedony (SiO₂), colored mainly by iron oxides) — mineral

Red jasper (tumbled river pebble)

Jasper, an opaque microcrystalline variety of quartz/chalcedony (SiO₂), colored mainly by iron oxides

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

Carnelian

Carnelian (Silicon Dioxide - SiO2)

Vesicular basalt (likely weathered volcanic rock) (Basalt, commonly composed of plagioclase, pyroxene, and olivine) — igneous

Vesicular basalt (likely weathered volcanic rock)

Basalt, commonly composed of plagioclase, pyroxene, and olivine

Tumbled Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Tumbled Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Botryoidal Chalcedony (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

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

Agate

Silicon Dioxide (Chalcedony), SiO2

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

Agate

Silicon Dioxide (Chalcedony), SiO2

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

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

Yellow Chalcedony

Silicon Dioxide (SiO2) - Chalcedony

Agate (Chalcedony (SiO2)) — sedimentary

Agate

Chalcedony (SiO2)

Chalcedony Geode Fragment (Botryoidal) (Silicon Dioxide (SiO2) - Cryptocrystalline Quartz) — mineral

Chalcedony Geode Fragment (Botryoidal)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Chalcedony (Quartz Pebbles) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Quartz Pebbles)

Silicon Dioxide (SiO2)

Botryoidal Chalcedony / Quartz (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony / Quartz

Silicon Dioxide (SiO2)

Quartz Druze (Silicon Dioxide (SiO2)) — mineral

Quartz Druze

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (mainly Quartz / SiO2)) — fossil

Petrified Wood

Silicified Wood (mainly Quartz / SiO2)

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

Petrified Wood

Silicified Wood (SiO2 permineralization)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Petrified Wood (Silicified Wood (SiO2)) — fossil

Petrified Wood

Silicified Wood (SiO2)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Yellow Chalcedony (Jasper/Chert Pebble) (Silicon Dioxide (SiO2)) — sedimentary

Yellow Chalcedony (Jasper/Chert Pebble)

Silicon Dioxide (SiO2)

Red Quartz (Druzy) (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Red Quartz (Druzy)

Silicon Dioxide (SiO2) with Hematite inclusions

Petrified Wood (Silicified Wood (SiO2)) — sedimentary

Petrified Wood

Silicified Wood (SiO2)

Milky Quartz with Iron Inclusions (Quartz (Silicon Dioxide, SiO2)) — mineral

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Ferruginous Quartz (Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)) — mineral

Ferruginous Quartz

Quartz with Iron Oxide inclusions (SiO2 + Fe2O3)

Carnelian Agate (Chalcedony (SiO2 with Iron Oxides)) — sedimentary

Carnelian Agate

Chalcedony (SiO2 with Iron Oxides)

Agate Geode (Silicon Dioxide (SiO2)) — sedimentary

Agate Geode

Silicon Dioxide (SiO2)

Chalcedony (Quartz) (Silicon dioxide (SiO2)) — mineral

Chalcedony (Quartz)

Silicon dioxide (SiO2)

Agate Geode Slice (Silicon Dioxide (SiO2) with trace elements) — sedimentary

Agate Geode Slice

Silicon Dioxide (SiO2) with trace elements

Geode (Calcite or Quartz) (Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)) — sedimentary

Geode (Calcite or Quartz)

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3)

Chalcedony (Agate/Chert variety) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate/Chert variety)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz

Riverstone Jasper (Silicon Dioxide (SiO2) with iron/clay inclusions) — sedimentary

Riverstone Jasper

Silicon Dioxide (SiO2) with iron/clay inclusions

Red Jasper (Silicon Dioxide (SiO2) with Hematite inclusions) — mineral

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Red Jasper (Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)) — mineral

Red Jasper

Silicon Dioxide with Hematite impurities (SiO2 + Fe2O3)

Granite boulder (Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole) — igneous

Granite boulder

Granite, composed mainly of quartz, alkali feldspar, plagioclase, and minor mica/amphibole

Dalmatian Jasper (Peralkaline Quartz-Feldspar Rock with Arfvedsonite) — igneous

Dalmatian Jasper

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Jasper (Iron-rich Chert) (Silicon Dioxide (SiO2) with impurities of Hematite or Goethite) — sedimentary

Jasper (Iron-rich Chert)

Silicon Dioxide (SiO2) with impurities of Hematite or Goethite

Geode (unopened) (Silica-filled Concretion (SiO2)) — sedimentary

Geode (unopened)

Silica-filled Concretion (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)