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

Pink Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — mineraloid

Pink Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Tumbled Agate (Silicon dioxide (SiO2)) — sedimentary

Tumbled Agate

Silicon dioxide (SiO2)

Banded Carnelian Agate (Cryptocrystalline Quartz (SiO2)) — sedimentary

Banded Carnelian Agate

Cryptocrystalline Quartz (SiO2)

Picture Jasper (Silicon Dioxide (SiO2) with iron oxide and organic impurities) — sedimentary

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and organic impurities

Red Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper or Carnelian (Agate) (Silicon Dioxide (SiO2)) — sedimentary

Red Jasper or Carnelian (Agate)

Silicon Dioxide (SiO2)

Jasper (Silicon dioxide (SiO2) with impurities) — sedimentary

Jasper

Silicon dioxide (SiO2) with impurities

Red Jasper (Microcrystalline quartz (SiO2) with Hematite (Fe2O3) impurities) — sedimentary

Red Jasper

Microcrystalline quartz (SiO2) with Hematite (Fe2O3) impurities

Chalcedony (Agate nodule fragment) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate nodule fragment)

Silicon Dioxide (SiO2)

Jasper (Cryptocrystalline quartz (SiO2)) — Sedimentary/Mineral

Jasper

Cryptocrystalline quartz (SiO2)

Sedimentary/Mineral

Jasper Agate (Silicon Dioxide (SiO2) - Chalcedony variety) — sedimentary

Jasper Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Breccia (Breccia) — sedimentary

Breccia

Breccia

Brecciated jasper (likely) (Silica-rich jasper/chert breccia, composed mainly of microcrystalline quartz (SiO₂)) — sedimentary

Brecciated jasper (likely)

Silica-rich jasper/chert breccia, composed mainly of microcrystalline quartz (SiO₂)

White Chalcedony (Silicon Dioxide (SiO2)) — mineral

White Chalcedony

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Botryoidal Quartz (Silicon Dioxide (SiO2)) — mineral

Botryoidal Quartz

Silicon Dioxide (SiO2)

Brown Chalcedony (Silicon Dioxide (SiO2)) — mineral

Brown Chalcedony

Silicon Dioxide (SiO2)

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

Agate

Silicon dioxide (Chalcedony), SiO2

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite/Iron Oxide inclusions

Red Jasper (Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)) — sedimentary

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Brecciated rock (possibly fault breccia) (Polymictic breccia; exact lithology cannot be determined from the photograph) — metamorphic

Brecciated rock (possibly fault breccia)

Polymictic breccia; exact lithology cannot be determined from the photograph

Petrified Wood (Silicified Wood (primarily SiO2)) — sedimentary

Petrified Wood

Silicified Wood (primarily SiO2)

Quartz Geode (Silicon dioxide (SiO2)) — mineral

Quartz Geode

Silicon dioxide (SiO2)

Tumbled jasper or chert pebble (Microcrystalline quartz, mainly SiO₂, likely jasper/chert) — mineral

Tumbled jasper or chert pebble

Microcrystalline quartz, mainly SiO₂, likely jasper/chert

Jasper / Agate (Chalcedony) (Silicon dioxide (SiO2)) — sedimentary

Jasper / Agate (Chalcedony)

Silicon dioxide (SiO2)

Jasper (Microcrystalline quartz (SiO2)) — sedimentary

Jasper

Microcrystalline quartz (SiO2)

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

Chert (and Chalcedony)

Silicon Dioxide (SiO2)

Petrified Wood (Silicified Wood (primarily Quartz/SiO2)) — mineral

Petrified Wood

Silicified Wood (primarily Quartz/SiO2)

Fine-grained dark igneous rock, likely basalt (Basalt, composed chiefly of plagioclase feldspar and pyroxene, with possible olivine or magnetite) — igneous

Fine-grained dark igneous rock, likely basalt

Basalt, composed chiefly of plagioclase feldspar and pyroxene, with possible olivine or magnetite

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Quartz Geode with Calcite (Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)) — mineral

Quartz Geode with Calcite

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3)

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

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Red Jasper (Red Jasper (SiO2)) — sedimentary

Red Jasper

Red Jasper (SiO2)

Quartz on Host Rock (Silicon Dioxide (SiO2)) — Mineral Specimen

Quartz on Host Rock

Silicon Dioxide (SiO2)

Mineral Specimen

Jasper with Iron Staining (Silicon Dioxide (SiO2) with Hematite (Fe2O3)) — sedimentary

Jasper with Iron Staining

Silicon Dioxide (SiO2) with Hematite (Fe2O3)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Rhyolitic jasper or iron-stained chert (Microcrystalline quartz (SiO₂), likely with hematite/goethite staining) — igneous

Rhyolitic jasper or iron-stained chert

Microcrystalline quartz (SiO₂), likely with hematite/goethite staining

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Jasper

Jasper (Silicon Dioxide, SiO2)

Polished orbicular jasper (likely ocean jasper) (Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals) — sedimentary

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂), with feldspar and iron-rich alteration minerals

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions