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 (Common Opal) (Amorphous Hydrated Silica (SiO2·nH2O)) — mineral

Pink Opal (Common Opal)

Amorphous Hydrated Silica (SiO2·nH2O)

Jasper (Chalcedony (SiO2)) — mineral

Jasper

Chalcedony (SiO2)

Dyed Imperial Jasper (SiO2 (Silicon Dioxide)) — gemstone

Dyed Imperial Jasper

SiO2 (Silicon Dioxide)

Carnelian Agate (Silicon Dioxide (SiO2) with iron oxide inclusions) — mineral

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide inclusions

Blue Chalcedony (Silicon Dioxide (SiO2)) — gemstone

Blue Chalcedony

Silicon Dioxide (SiO2)

Carnelian Agate Beads (Silicon Dioxide (SiO2)) — gemstone

Carnelian Agate Beads

Silicon Dioxide (SiO2)

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

Chalcedony / Agate Nodule

Silicon Dioxide (SiO2)

Amethyst Geode (Quartz (Silicon Dioxide, SiO2) with iron impurities) — mineral

Amethyst Geode

Quartz (Silicon Dioxide, SiO2) with iron impurities

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Carnelian Agate (Silicon Dioxide (Chalcedony variety)) — mineral

Carnelian Agate

Silicon Dioxide (Chalcedony variety)

Chalcedony (Silicon Dioxide (SiO2)) — mineral

Chalcedony

Silicon Dioxide (SiO2)

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

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

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

Jasper

Silicon Dioxide (SiO2) microcrystalline quartz variety

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Carnelian (SiO2 (Variety of Chalcedony)) — gemstone

Carnelian

SiO2 (Variety of Chalcedony)

Carnelian (SiO2 (Silicon dioxide)) — mineral

Carnelian

SiO2 (Silicon dioxide)

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

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

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Jasper (Silicon Dioxide (SiO2)) — sedimentary

Jasper

Silicon Dioxide (SiO2)

Turquoise (Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O) — mineral

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Fluorite (Calcium fluoride (CaF2)) — mineral

Fluorite

Calcium fluoride (CaF2)

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

Quartz Geode (Cracked)

Silicon Dioxide (SiO2)

Native Gold (in earring form) (Gold (Au)) — mineral

Native Gold (in earring form)

Gold (Au)

Quartz Geode (Crystalline Silicon Dioxide (SiO2) in Geode) — mineral

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode

Bamboo Leaf Jasper (Silicified Siltstone or Jasper (SiO2)) — sedimentary

Bamboo Leaf Jasper

Silicified Siltstone or Jasper (SiO2)

Quartz Geode with Calcite (Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)) — Mineral/Geode

Quartz Geode with Calcite

Silicon Dioxide (SiO2) and Calcium Carbonate (CaCO3)

Specular Hematite (Polished Sphere) (Hematite (Alpha Fe2O3)) — mineral

Specular Hematite (Polished Sphere)

Hematite (Alpha Fe2O3)

Botryoidal Quartz (Silicon Dioxide (SiO2)) — mineral

Botryoidal Quartz

Silicon Dioxide (SiO2)

Weathered, vesicular volcanic rock (likely basaltic scoria) (Scoria, probably basaltic; exact identification requires testing) — igneous

Weathered, vesicular volcanic rock (likely basaltic scoria)

Scoria, probably basaltic; exact identification requires testing

Agate (Chalcedony (SiO2)) — sedimentary

Agate

Chalcedony (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Weathered volcanic rock, likely altered basalt/andesite (Fine-grained mafic to intermediate volcanic rock; possible chlorite–calcite alteration) — igneous

Weathered volcanic rock, likely altered basalt/andesite

Fine-grained mafic to intermediate volcanic rock; possible chlorite–calcite alteration

Orbicular rhyolite (orbicular jasper-like volcanic rock) (Orbicular rhyolite; predominantly quartz, alkali feldspar, plagioclase, and volcanic glass, with concentric spherulitic growths) — igneous

Orbicular rhyolite (orbicular jasper-like volcanic rock)

Orbicular rhyolite; predominantly quartz, alkali feldspar, plagioclase, and volcanic glass, with concentric spherulitic growths

Geode (Quartz nodule / Chalcedony-lined cavity) — sedimentary

Geode

Quartz nodule / Chalcedony-lined cavity

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

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Tumbled jasper pebble (Chalcedony-rich microcrystalline quartz (SiO₂), commonly called brown or brecciated jasper) — sedimentary

Tumbled jasper pebble

Chalcedony-rich microcrystalline quartz (SiO₂), commonly called brown or brecciated jasper

Jasper with Agate Inclusions (Silicon Dioxide (SiO2) - variety of Quartz/Chert) — sedimentary

Jasper with Agate Inclusions

Silicon Dioxide (SiO2) - variety of Quartz/Chert

Banded Agate (Jasper-Agate) (Silicon Dioxide (SiO2)) — sedimentary

Banded Agate (Jasper-Agate)

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2) with hematite impurities) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) with hematite impurities

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

Quartz with Calcite / Geode Fragment

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3)