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

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

Pumice (Pumice (extrusive volcanic glass)) — igneous

Pumice

Pumice (extrusive volcanic glass)

Polished/tumbled brown-and-white jasper (Microcrystalline quartz (SiO₂), commonly called jasper; likely brecciated or banded jasper) — sedimentary

Polished/tumbled brown-and-white jasper

Microcrystalline quartz (SiO₂), commonly called jasper; likely brecciated or banded jasper

Polished red jasper (Jasper, an opaque microcrystalline variety of quartz (SiO₂), colored mainly by iron oxides) — sedimentary

Polished red jasper

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

Polished ocean jasper (orbicular jasper) (Microcrystalline quartz/chalcedony (SiO₂) with iron-rich and volcanic inclusions) — sedimentary

Polished ocean jasper (orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂) with iron-rich and volcanic inclusions

Red jasper (probable iron-rich chert) (Jasper, microcrystalline quartz (SiO₂) colored chiefly by hematite/goethite) — sedimentary

Red jasper (probable iron-rich chert)

Jasper, microcrystalline quartz (SiO₂) colored chiefly by hematite/goethite

Red Jasper (River Pebble) (Silicon Dioxide (SiO2) with Hematite impurities) — sedimentary

Red Jasper (River Pebble)

Silicon Dioxide (SiO2) with Hematite impurities

Brecciated jasper (likely ocean jasper or red jasper breccia) (Silica-rich microcrystalline quartz/chalcedony (SiO₂) with hematite/goethite and iron-oxide matrix) — sedimentary

Brecciated jasper (likely ocean jasper or red jasper breccia)

Silica-rich microcrystalline quartz/chalcedony (SiO₂) with hematite/goethite and iron-oxide matrix

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Yellow Jasper (Silicon dioxide (SiO2)) — sedimentary

Yellow Jasper

Silicon dioxide (SiO2)

Jasper (Chert (Silica: SiO2)) — sedimentary

Jasper

Chert (Silica: SiO2)

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

Jasper (Tumbled)

Silicon Dioxide (SiO₂)

Altered volcanic rock, possibly andesite (Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins) — igneous

Altered volcanic rock, possibly andesite

Likely porphyritic andesite or dacite with secondary chlorite/epidote and quartz–calcite veins

Jasp-Agate (Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions) — sedimentary

Jasp-Agate

Cryptocrystalline Quartz (SiO2) with Iron Oxide inclusions

Jasper Cross (Silicon Dioxide (SiO2) with iron oxide impurities) — sedimentary

Jasper Cross

Silicon Dioxide (SiO2) with iron oxide impurities

Vesicular basalt (probable) (Basalt, typically composed of plagioclase, pyroxene, and olivine) — igneous

Vesicular basalt (probable)

Basalt, typically composed of plagioclase, pyroxene, and olivine

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

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Chalcedony (Yellow Chert / Agate) (Quartz (Silicon Dioxide - SiO2)) — mineral

Chalcedony (Yellow Chert / Agate)

Quartz (Silicon Dioxide - SiO2)

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

Yellow Chalcedony / Carnelian

Silicon Dioxide (SiO2)

Brown Chalcedony (Agate/Jasper) (Cryptocrystalline Quartz (SiO2)) — mineral

Brown Chalcedony (Agate/Jasper)

Cryptocrystalline Quartz (SiO2)

Chalcedony Bangle (SiO2) — gemstone

Chalcedony Bangle

SiO2

Geode or Concretion (Silica-filled nodule (likely SiO2)) — sedimentary

Geode or Concretion

Silica-filled nodule (likely SiO2)

Jasper (Silicon Dioxide (SiO2)) — mineral

Jasper

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2) within a geode) — mineral

Quartz Geode

Silicon Dioxide (SiO2) within a geode

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

Jasper with Quartz Vein

Microcrystalline quartz (SiO2) with impurities

Gemstone Tree Brooch (Agate and Quartz) (Silicon Dioxide (SiO2)) — mineral

Gemstone Tree Brooch (Agate and Quartz)

Silicon Dioxide (SiO2)

Carnelian (Silicon Dioxide (Chalcedony variety)) — gemstone

Carnelian

Silicon Dioxide (Chalcedony variety)

Jasper and Chalcedony Composite (Silicon Dioxide (SiO2) microcrystalline quartz) — sedimentary

Jasper and Chalcedony Composite

Silicon Dioxide (SiO2) microcrystalline quartz

Quartz (Agate/Chalcedony nodule) (Silicon dioxide (SiO2)) — mineral

Quartz (Agate/Chalcedony nodule)

Silicon dioxide (SiO2)

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

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Agate Geode (Silicon Dioxide (Chalcedony/Quartz), SiO2) — sedimentary

Agate Geode

Silicon Dioxide (Chalcedony/Quartz), SiO2

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

Smoky Quartz / Chalcedony

Silicon Dioxide (SiO2)

Geode (Small unopened nodule) (Quartz-lined nodule (SiO2)) — sedimentary

Geode (Small unopened nodule)

Quartz-lined nodule (SiO2)

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

Agate (Chalcedony Pebble)

Silicon Dioxide (SiO2)

Pyrite (Iron Pyrite (FeS2)) — mineral

Pyrite

Iron Pyrite (FeS2)

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

Chalcedony with Quartz

Silicon Dioxide (SiO2)

Carnelian (Silicon Dioxide (Quartz variety), SiO2) — mineral

Carnelian

Silicon Dioxide (Quartz variety), SiO2

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

Agate

Silicon dioxide (chalcedony), SiO2

Precious Opal (Hydrated amorphous silica, SiO2·nH2O) — gemstone

Precious Opal

Hydrated amorphous silica, SiO2·nH2O

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

Carnelian

Silicon Dioxide (Chalcedony variety), SiO2

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

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

Chalcedony (Common Opal or Agate)

Silicon Dioxide (SiO2)