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

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

Jasper

Jasper / Silicon Dioxide (SiO₂)

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

Jasper (Jasper (Silicon Dioxide, SiO2 plus various impurities)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2 plus various impurities)

Chalcedony (Common Opal variant or Chert/Flint) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Common Opal variant or Chert/Flint)

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2) with impurities) — sedimentary

Jasper

Microcrystalline Quartz (SiO2) with impurities

Fine-grained brown-gray rock, possibly andesite (Likely andesite or another fine-grained volcanic rock; exact identification is uncertain from the photo) — igneous

Fine-grained brown-gray rock, possibly andesite

Likely andesite or another fine-grained volcanic rock; exact identification is uncertain from the photo

Weathered porphyritic volcanic rock (likely andesite or basalt) (Porphyritic andesite/basalt; typically plagioclase feldspar ± pyroxene, olivine, and iron oxides) — igneous

Weathered porphyritic volcanic rock (likely andesite or basalt)

Porphyritic andesite/basalt; typically plagioclase feldspar ± pyroxene, olivine, and iron oxides

Tumbled Agate (Silicon Dioxide (Chalcedony variety), SiO2) — gemstone

Tumbled Agate

Silicon Dioxide (Chalcedony variety), SiO2

Polished orbicular jasper (likely ocean jasper) (Jasper: microcrystalline quartz (SiO₂), with iron oxides and other silicate inclusions) — sedimentary

Polished orbicular jasper (likely ocean jasper)

Jasper: microcrystalline quartz (SiO₂), with iron oxides and other silicate inclusions

Polished orbicular jasper (Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions) — sedimentary

Polished orbicular jasper

Orbicular jasper; microcrystalline quartz (SiO₂) with hematite/goethite and other silicate inclusions

Polished ocean jasper / orbicular jasper (Silicified rhyolite or chalcedony-rich microcrystalline quartz (SiO₂), commonly sold as ocean jasper) — sedimentary

Polished ocean jasper / orbicular jasper

Silicified rhyolite or chalcedony-rich microcrystalline quartz (SiO₂), commonly sold as ocean jasper

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

Chalcedony (Agate/Carnelian)

Silicon Dioxide (SiO2)

Rounded dark river pebble (Likely fine-grained basalt or andesite; exact identification requires a fresh surface or tests) — sedimentary

Rounded dark river pebble

Likely fine-grained basalt or andesite; exact identification requires a fresh surface or tests

Small yellow mineral specimen, possibly sulfur (Unidentified; native sulfur (S) is a possibility) — mineral

Small yellow mineral specimen, possibly sulfur

Unidentified; native sulfur (S) is a possibility

Celestine (or Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (or Celestite)

Strontium sulfate (SrSO4)

Jasper (Chalcedony (SiO2)) — mineral

Jasper

Chalcedony (SiO2)

Sea stacks and coastal cliffs (Likely basaltic sea stacks (rock type cannot be confirmed from the image)) — sedimentary

Sea stacks and coastal cliffs

Likely basaltic sea stacks (rock type cannot be confirmed from the image)

Red jasper (likely tumbled or polished) (Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored by iron oxides) — mineral

Red jasper (likely tumbled or polished)

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

Jasper (SiO2 (Cryptocrystalline quartz)) — mineral

Jasper

SiO2 (Cryptocrystalline quartz)

Jasper (SiO2) — sedimentary

Jasper

SiO2

Jasper (Chalcedony (SiO2)) — mineral

Jasper

Chalcedony (SiO2)

Carnelian (Silicon Dioxide (SiO2) with iron oxide impurities) — mineral

Carnelian

Silicon Dioxide (SiO2) with iron oxide impurities

Chalcedony (Silicon dioxide (SiO2)) — mineral

Chalcedony

Silicon dioxide (SiO2)

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

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Banded Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Agate

Cryptocrystalline Quartz (SiO2)

Banded Agate (Tumbled) (Silicon Dioxide (SiO2)) — sedimentary

Banded Agate (Tumbled)

Silicon Dioxide (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2)) — gemstone

Carnelian Agate

Silicon Dioxide (SiO2)

Carnelian (Silicon Dioxide (Chalcedony variety), SiO2) — gemstone

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2

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

Banded Agate (Chert / Chalcedony)

Silicon Dioxide (SiO2)

Quartz Geode Fragment (Silicon Dioxide (SiO2)) — mineral

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Tumbled Onyx / Black Chalcedony (Silicon Dioxide (SiO2)) — mineral

Tumbled Onyx / Black Chalcedony

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Banded Agate (Cryptocrystalline Silicon Dioxide (SiO2)) — gemstone

Banded Agate

Cryptocrystalline Silicon Dioxide (SiO2)

Amethyst and Calcite collection (Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)) — mineral

Amethyst and Calcite collection

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Crazy Lace Agate (Butterfly Carving) (Silicon Dioxide (Microcrystalline Quartz) - SiO2) — sedimentary

Crazy Lace Agate (Butterfly Carving)

Silicon Dioxide (Microcrystalline Quartz) - SiO2

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

Yellow Chalcedony (likely Carnelian or Agate) (Silicon dioxide (SiO2)) — mineral

Yellow Chalcedony (likely Carnelian or Agate)

Silicon dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Agate (Silicon Dioxide (SiO2)) — mineral

Agate

Silicon Dioxide (SiO2)

Carnelian Agate (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Jasper (Silicon dioxide (Quartz variety), SiO2) — sedimentary

Jasper

Silicon dioxide (Quartz variety), SiO2