Rock Identifier

Category

Non Geological

Browse non geological specimens identified by the Rock Identifier community.

Learn about Non Geological in the encyclopedia

Common Opal

Mudstone

Green Beryl

Matte Obsidian

Sapphire

Hornfels

Argillite

Mint Opal

Plazolite

Bixbite

Obsidian (Obsidian (Amorphous volcanic glass)) — igneous

Obsidian

Obsidian (Amorphous volcanic glass)

Obsidian (Volcanic glass (mainly SiO2)) — Igneous

Obsidian

Volcanic glass (mainly SiO2)

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Black Obsidian (Obsidian (Volcanic Glass)) — igneous

Black Obsidian

Obsidian (Volcanic Glass)

Quartz-rich conglomeratic sandstone (Lithic arkose/conglomerate, dominated by quartz and feldspar grains) — sedimentary

Quartz-rich conglomeratic sandstone

Lithic arkose/conglomerate, dominated by quartz and feldspar grains

Weathered iron-rich river pebble (Ferruginous chert or ironstone pebble; exact identification requires testing) — sedimentary

Weathered iron-rich river pebble

Ferruginous chert or ironstone pebble; exact identification requires testing

Biotite (Black Mica) (K(Mg,Fe)3AlSi3O10(F,OH)2) — mineral

Biotite (Black Mica)

K(Mg,Fe)3AlSi3O10(F,OH)2

Porous limestone (likely reef or shell limestone) (Calcium-carbonate rock, predominantly calcite (CaCO₃); possibly bioclastic limestone or coquina) — sedimentary

Porous limestone (likely reef or shell limestone)

Calcium-carbonate rock, predominantly calcite (CaCO₃); possibly bioclastic limestone or coquina

Weathered iron-rich river pebble (Ferruginous chert or ironstone (hematite/goethite-bearing silica-rich rock)) — sedimentary

Weathered iron-rich river pebble

Ferruginous chert or ironstone (hematite/goethite-bearing silica-rich rock)

Common Opal (Green Opal / Pistachio Opal) (Hydrated silica (SiO2·nH2O)) — mineraloid

Common Opal (Green Opal / Pistachio Opal)

Hydrated silica (SiO2·nH2O)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Porous limestone fragment (Calcite-rich limestone (CaCO₃), possibly bioclastic limestone) — sedimentary

Porous limestone fragment

Calcite-rich limestone (CaCO₃), possibly bioclastic limestone

Blue Sapphire (Ceylon) (Corundum (Al2O3) with traces of Iron and Titanium) — mineral

Blue Sapphire (Ceylon)

Corundum (Al2O3) with traces of Iron and Titanium

Quartzite (Metamorphic Quartzite (primarily SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (primarily SiO2)

Native gold nugget (probable) (Native gold, Au; possibly gold-bearing quartz) — mineral

Native gold nugget (probable)

Native gold, Au; possibly gold-bearing quartz

Quartzite (Metamorphic Quartzite (SiO2)) — metamorphic

Quartzite

Metamorphic Quartzite (SiO2)

Black Obsidian (Obsidian (Volcanic Glass)) — igneous

Black Obsidian

Obsidian (Volcanic Glass)

Obsidian (Obsidian (principally SiO2 + MgO, Fe3O4)) — igneous

Obsidian

Obsidian (principally SiO2 + MgO, Fe3O4)

Polished mahogany obsidian (Volcanic glass, primarily rhyolitic composition (SiO₂-rich); mahogany coloration from iron-oxide inclusions) — igneous

Polished mahogany obsidian

Volcanic glass, primarily rhyolitic composition (SiO₂-rich); mahogany coloration from iron-oxide inclusions

Obsidian (Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)) — igneous

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Obsidian (Volcanic Glass (SiO2)) — igneous

Obsidian

Volcanic Glass (SiO2)

Polished jasper/chalcedony pebble (Cryptocrystalline silica, mainly SiO₂; likely brecciated or orbicular jasper with chalcedony) — gemstone

Polished jasper/chalcedony pebble

Cryptocrystalline silica, mainly SiO₂; likely brecciated or orbicular jasper with chalcedony

Banded Chert (Microcrystalline Quartz (SiO2)) — sedimentary

Banded Chert

Microcrystalline Quartz (SiO2)

Likely tumbled dark volcanic rock (Probably basalt or fine-grained andesite; exact identification requires testing) — igneous

Likely tumbled dark volcanic rock

Probably basalt or fine-grained andesite; exact identification requires testing

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Black Obsidian (Volcanic Glass (SiO2 + impurities)) — igneous

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Goldstone (Red/Brown) (Aventurine Glass (SiO2 with Copper inclusions)) — Mineral (Man-made glass)

Goldstone (Red/Brown)

Aventurine Glass (SiO2 with Copper inclusions)

Mineral (Man-made glass)

Pink rose quartz (Quartz, SiO₂ (pink massive variety)) — mineral

Pink rose quartz

Quartz, SiO₂ (pink massive variety)

Botryoidal calcite cluster (Calcite (CaCO₃), likely iron-stained; possibly associated with aragonite or quartz) — mineral

Botryoidal calcite cluster

Calcite (CaCO₃), likely iron-stained; possibly associated with aragonite or quartz

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Siltstone (Siltstone (primarily composed of microcrystalline Quartz and Feldspar)) — sedimentary

Siltstone

Siltstone (primarily composed of microcrystalline Quartz and Feldspar)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Red cabochon gemstone, likely carnelian or dyed chalcedony (Chalcedony (microcrystalline quartz), SiO₂; exact identification requires testing) — gemstone

Red cabochon gemstone, likely carnelian or dyed chalcedony

Chalcedony (microcrystalline quartz), SiO₂; exact identification requires testing

Slag Glass (Cullet Glass) (Amorphous Silica (Industrial byproduct)) — mineral

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Quartz with Iron Oxide Staining (Silicon Dioxide (SiO2)) — mineral

Quartz with Iron Oxide Staining

Silicon Dioxide (SiO2)

Milky quartz (rough quartz specimen) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz specimen)

Quartz, silicon dioxide (SiO₂)

Quartzite (Metamorphic Quartz Rock (SiO2)) — metamorphic

Quartzite

Metamorphic Quartz Rock (SiO2)

Quartzite (Metamorphic Quartzite) — metamorphic

Quartzite

Metamorphic Quartzite

Milky quartz (Quartz (silicon dioxide, SiO₂)) — mineral

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz (rough quartz fragment) (Quartz, silicon dioxide (SiO₂)) — mineral

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Weathered iron-rich concretion or possible meteorite (Likely limonite/goethite concretion; meteorite status unconfirmed) — mineral

Weathered iron-rich concretion or possible meteorite

Likely limonite/goethite concretion; meteorite status unconfirmed