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

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Black Opal (Triplet) (Hydrated Silica (SiO2·nH2O)) — mineral

Black Opal (Triplet)

Hydrated Silica (SiO2·nH2O)

Jasper / Agate / Chalcedony (Cryptocrystalline quartz (SiO2)) — mineral

Jasper / Agate / Chalcedony

Cryptocrystalline quartz (SiO2)

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

Jasper (Brown Jasper)

Microcrystalline Quartz (Chalcedony), SiO2

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

Carnelian / Agate

Silicon Dioxide (SiO2) - Chalcedony variety

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

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

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

Chalcedony (Carnelian / Agate)

Silicon Dioxide (SiO2)

Polished Tumbled Stone (Dark Chalcedony / Jasper) (Silicon Dioxide (SiO2)) — mineral

Polished Tumbled Stone (Dark Chalcedony / Jasper)

Silicon Dioxide (SiO2)

Bloodstone (Heliotrope) (SiO2 (Cryptocrystalline Quartz / Chalcedony)) — mineral

Bloodstone (Heliotrope)

SiO2 (Cryptocrystalline Quartz / Chalcedony)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Jasper with Purple Fluorite or Chalcedony (Silicon Dioxide (SiO2) with mineral inclusions) — sedimentary

Jasper with Purple Fluorite or Chalcedony

Silicon Dioxide (SiO2) with mineral inclusions

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Botryoidal Chalcedony (Silicon Dioxide (SiO2)) — mineral

Botryoidal Chalcedony

Silicon Dioxide (SiO2)

Likely weathered sandstone or iron-rich volcanic rock (Indeterminate from photograph; probable ferruginous sandstone, possibly altered volcanic rock) — sedimentary

Likely weathered sandstone or iron-rich volcanic rock

Indeterminate from photograph; probable ferruginous sandstone, possibly altered volcanic rock

Jasper (Microcrystalline Quartz (SiO2)) — mineral

Jasper

Microcrystalline Quartz (SiO2)

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Leopard Skin Jasper (Silicon Dioxide (SiO2) with various inclusions) — sedimentary

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

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

Jasper

Silicon Dioxide (SiO2) with iron oxide impurities

Carnelian (SiO2 (Silicon Dioxide) with Ferric Oxide inclusions) — mineral

Carnelian

SiO2 (Silicon Dioxide) with Ferric Oxide inclusions

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Red Jasper (Silicon Dioxide with Iron Oxide (SiO2)) — sedimentary

Red Jasper

Silicon Dioxide with Iron Oxide (SiO2)

Red Jasper (Silicon Dioxide (SiO2)) — sedimentary

Red Jasper

Silicon Dioxide (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Jasper (Silicon dioxide (SiO2)) — sedimentary

Jasper

Silicon dioxide (SiO2)

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

Yellow Jasper

Silicon Dioxide (SiO2) with Iron inclusions

Red-and-white jasper/chalcedony pebble (Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz) — mineral

Red-and-white jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz

Carnelian (Carnelian (Chalcedony/Quartz, SiO2)) — mineral

Carnelian

Carnelian (Chalcedony/Quartz, SiO2)

Blue Chalcedony (Silicon Dioxide (SiO2)) — mineral

Blue Chalcedony

Silicon Dioxide (SiO2)

Rounded gray river pebble, likely fine-grained basalt or andesite (Basaltic-andesitic volcanic rock; commonly plagioclase feldspar, pyroxene, and minor iron oxides) — igneous

Rounded gray river pebble, likely fine-grained basalt or andesite

Basaltic-andesitic volcanic rock; commonly plagioclase feldspar, pyroxene, and minor iron oxides

Leopard Skin Jasper (Rhyolite (Silicon Dioxide with impurities), SiO2) — igneous

Leopard Skin Jasper

Rhyolite (Silicon Dioxide with impurities), SiO2

Weathered porphyritic volcanic rock (Likely altered andesite or rhyolite porphyry) — igneous

Weathered porphyritic volcanic rock

Likely altered andesite or rhyolite porphyry

Polished jasper (Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions) — mineral

Polished jasper

Microcrystalline quartz (chalcedony), chiefly SiO₂, with iron-oxide and other mineral inclusions

Tumbled dark gray stone, possibly basalt or andesite (Fine-grained mafic to intermediate volcanic rock; exact mineralogy cannot be confirmed from the photograph) — igneous

Tumbled dark gray stone, possibly basalt or andesite

Fine-grained mafic to intermediate volcanic rock; exact mineralogy cannot be confirmed from the photograph

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

Brown Jasper (Tumbled)

Silicon Dioxide (SiO2) with iron oxide inclusions

Red Jasper and Hematite (Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)) — mineral

Red Jasper and Hematite

Silicon Dioxide (SiO2) and Iron Oxide (Fe2O3)

Fluorite, Turquoise, and Calcite set (Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)) — mineral

Fluorite, Turquoise, and Calcite set

Calcium Fluoride (CaF2), Hydrous Phosphate of Copper and Aluminum (CuAl6(PO4)4(OH)8·4H2O), Calcium Carbonate (CaCO3)

Quartz Geode (Silicon Dioxide (SiO2) in Host Rock) — sedimentary

Quartz Geode

Silicon Dioxide (SiO2) in Host Rock

Red Jasper (Polished) (Jasper (Iron-rich Microcrystalline Quartz, SiO2)) — sedimentary

Red Jasper (Polished)

Jasper (Iron-rich Microcrystalline Quartz, SiO2)

Geode (Chert or Quartz Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Geode (Chert or Quartz Nodule)

Silicon Dioxide (SiO2)

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

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Green Opal (Hydrated Silica (SiO2·nH2O)) — mineraloid

Green Opal

Hydrated Silica (SiO2·nH2O)