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

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

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

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

Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

Jasper (Jasper (Silicate mineral, SiO2)) — sedimentary

Jasper

Jasper (Silicate mineral, SiO2)

Red jasper (likely iron-rich chert) (Microcrystalline quartz (SiO₂), colored mainly by hematite/goethite impurities) — sedimentary

Red jasper (likely iron-rich chert)

Microcrystalline quartz (SiO₂), colored mainly by hematite/goethite impurities

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

Red Jasper

Silicon Dioxide (SiO2 with Hematite inclusions)

Yellow Jasper (Silicon Dioxide (SiO2) with Goethite or Limonite inclusions) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with Goethite or Limonite inclusions

Red Jasper (Chalcedony (SiO2) with iron inclusions) — sedimentary

Red Jasper

Chalcedony (SiO2) with iron inclusions

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

Red Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

sedimentary/mineral

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

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Yellow Jasper (Silicon Dioxide (SiO2) with iron impurities) — mineral

Yellow Jasper

Silicon Dioxide (SiO2) with iron impurities

Tumbled brown jasper (Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments) — mineral

Tumbled brown jasper

Microcrystalline quartz (SiO₂), chiefly chalcedony with iron-oxide pigments

Polished jasper pebble (Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities) — mineral

Polished jasper pebble

Jasper, microcrystalline quartz (SiO₂) with iron-oxide impurities

Polished jasper pebble (Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions) — mineral

Polished jasper pebble

Microcrystalline quartz, SiO₂, with iron-oxide and clay inclusions

Polished brown jasper (likely brecciated or orbicular jasper) (Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions) — mineral

Polished brown jasper (likely brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony, SiO₂, with iron-oxide inclusions

Tumbled brecciated jasper (Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony) — mineral

Tumbled brecciated jasper

Jasper, microcrystalline quartz (SiO₂), commonly with iron oxides and chalcedony

Carnelian (Chalcedony (SiO2 with Iron Oxide inclusions)) — mineral

Carnelian

Chalcedony (SiO2 with Iron Oxide inclusions)

Carnelian (a variety of Chalcedony) (SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)) — mineral

Carnelian (a variety of Chalcedony)

SiO2 (Silicon Dioxide) primarily colored by iron oxide (Hematite)

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

Red Carnelian

Carnelian (Silicon Dioxide - SiO2)

Quartz Geode (Silicon Dioxide (SiO2) in a sedimentary host) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in a sedimentary host

Polished brecciated jasper (Jasper, microcrystalline quartz (SiO₂), with iron-oxide inclusions) — mineral

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide inclusions

Polished brown jasper pebble with a quartz vein (Jasper (microcrystalline quartz, SiO₂), traversed by quartz or chalcedony) — mineral

Polished brown jasper pebble with a quartz vein

Jasper (microcrystalline quartz, SiO₂), traversed by quartz or chalcedony

Red jasper (likely polished/tumbled) (Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite) — mineral

Red jasper (likely polished/tumbled)

Microcrystalline quartz, SiO₂, colored mainly by hematite/goethite

Polished brecciated jasper (Brecciated jasper, an opaque microcrystalline quartz variety (SiO₂) with iron-oxide and other mineral fragments) — gemstone

Polished brecciated jasper

Brecciated jasper, an opaque microcrystalline quartz variety (SiO₂) with iron-oxide and other mineral fragments

Polished striped jasper (Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and clay-mineral inclusions) — gemstone

Polished striped jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and clay-mineral inclusions

Rounded quartz-rich river cobble (probable rhyolite/granite-derived stone) (Indeterminate felsic igneous cobble; likely quartz–feldspar aggregate with minor iron oxides) — igneous

Rounded quartz-rich river cobble (probable rhyolite/granite-derived stone)

Indeterminate felsic igneous cobble; likely quartz–feldspar aggregate with minor iron oxides

Red jasper (Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides) — mineral

Red jasper

Jasper, microcrystalline quartz (SiO₂) colored mainly by iron oxides

Tumbled reddish jasper (Microcrystalline quartz (SiO₂), commonly colored by iron oxides) — mineral

Tumbled reddish jasper

Microcrystalline quartz (SiO₂), commonly colored by iron oxides

Likely tumbled carnelian or orange chalcedony (Microcrystalline quartz, SiO₂ (chalcedony variety)) — gemstone

Likely tumbled carnelian or orange chalcedony

Microcrystalline quartz, SiO₂ (chalcedony variety)

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

Agate (Chalcedony)

Silicon Dioxide (SiO2)

Tumbled carnelian (Carnelian, orange-red variety of cryptocrystalline chalcedony (SiO₂)) — gemstone

Tumbled carnelian

Carnelian, orange-red variety of cryptocrystalline chalcedony (SiO₂)

Jasper (brecciated or orbicular jasper) (Microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides and other impurities) — mineral

Jasper (brecciated or orbicular jasper)

Microcrystalline quartz/chalcedony (SiO₂), colored by iron oxides and other impurities

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

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Agate (specifically Lace Agate or Banded Agate) (Silicon Dioxide (SiO2)) — mineral

Agate (specifically Lace Agate or Banded Agate)

Silicon Dioxide (SiO2)

Assorted Tumbled Gemstones (Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)) — mineral

Assorted Tumbled Gemstones

Mixed oxides and silicates (including Quartz, Chalcedony, and Feldspar variants)

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

Jasper

Silicon Dioxide (SiO2) - Jasper (Microcrystalline Quartz)

River Stone (likely Andesite or Siltstone) (Intermediate Volcanic Rock / Fine-grained Sedimentary Rock) — igneous

River Stone (likely Andesite or Siltstone)

Intermediate Volcanic Rock / Fine-grained Sedimentary Rock

Agate (Silicon Dioxide (Quartz), SiO2) — mineral

Agate

Silicon Dioxide (Quartz), SiO2

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

Agate Nodule

Silicon Dioxide (Quartz/Chalcedony), SiO2

Quartz Geode (Silicon Dioxide (SiO2)) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2)

Porous vesicular volcanic rock (likely scoria) (Scoria; chiefly iron-rich volcanic glass with plagioclase, pyroxene, and/or olivine) — igneous

Porous vesicular volcanic rock (likely scoria)

Scoria; chiefly iron-rich volcanic glass with plagioclase, pyroxene, and/or olivine

Imperial Jasper (Microcrystalline Quartz (Chalcedony), SiO2) — sedimentary

Imperial Jasper

Microcrystalline Quartz (Chalcedony), SiO2

Tumbled brown chert or jasper (Microcrystalline quartz (SiO₂), likely chalcedony/chert with iron-oxide impurities) — sedimentary

Tumbled brown chert or jasper

Microcrystalline quartz (SiO₂), likely chalcedony/chert with iron-oxide impurities