Rock Identifier

Category

Not A Natural Rock

Browse not a natural rock specimens identified by the Rock Identifier community.

Learn about Not A Natural Rock in the encyclopedia

Asphalt Rock

Rock Gypsum

Coral Rock

Rock Salt

Calc-Silicate Rock

Calc-Silicate Rock

Talc-carbonate Rock

Talc-carbonate Rock

Chalk

Obsidian

Baddeleyite

Cataclasite

Anorthosite

Kimberlite

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Green Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Green Jasper

Microcrystalline Quartz (SiO2)

Hag Stone (Banded Chert or Limestone with Borehole) (Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)) — sedimentary

Hag Stone (Banded Chert or Limestone with Borehole)

Microcrystalline Quartz (Chert) or Calciferous Siltstone (CaCO3/SiO2)

Sandstone (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Blue Topaz (Al2SiO4(F,OH)2) — gemstone

Blue Topaz

Al2SiO4(F,OH)2

Shale fragment (Shale (Laminated Mudstone)) — sedimentary

Shale fragment

Shale (Laminated Mudstone)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Red Sandstone (Arenite (primarily Quartz with Hematite cement)) — sedimentary

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Hag Stone (Perforated Calcarenite or Chert) — sedimentary

Hag Stone

Perforated Calcarenite or Chert

Shale (Shale (Argillaceous sedimentary rock)) — sedimentary

Shale

Shale (Argillaceous sedimentary rock)

Dyed Agate (Silicon Dioxide (SiO2) with synthetic dyes) — mineral

Dyed Agate

Silicon Dioxide (SiO2) with synthetic dyes

Kimberlite (Kimberlite (Potassic ultramafic igneous rock)) — igneous

Kimberlite

Kimberlite (Potassic ultramafic igneous rock)

Sandstone (Ferruginous) (Arenite (with Iron Oxide)) — sedimentary

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Granite (Intrusive Phaneritic Felsic Igneous Rock) — igneous

Granite

Intrusive Phaneritic Felsic Igneous Rock

Sandstone (Arenite (primarily SiO2 with various cementing agents)) — sedimentary

Sandstone

Arenite (primarily SiO2 with various cementing agents)

Red Sandstone (Iron-rich) (Arenite (with Hematite cement)) — sedimentary

Red Sandstone (Iron-rich)

Arenite (with Hematite cement)

Citrine (Heat-Treated Amethyst) (Silicon Dioxide (SiO2)) — mineral

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Unidentified gray stone (Likely quartz-rich stone; exact identification is not possible from the image) — mineral

Unidentified gray stone

Likely quartz-rich stone; exact identification is not possible from the image

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

Hag Stone (Perforated Quartz / Sedimentary Rock) — sedimentary

Hag Stone

Perforated Quartz / Sedimentary Rock

River Rock (Sandstone or Quartzite) (Clastic Sedimentary Rock / Quartzite) — sedimentary

River Rock (Sandstone or Quartzite)

Clastic Sedimentary Rock / Quartzite

Opalite (Synthetic Opalised Glass) — glass

Opalite

Synthetic Opalised Glass

Herkimer Diamond (Quartz (Silicon Dioxide, SiO2)) — mineral

Herkimer Diamond

Quartz (Silicon Dioxide, SiO2)

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

Carnelian Agate Beads

Silicon Dioxide (SiO2)

Smoky Quartz on Feldspar (Granite Pegmatite) (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)) — igneous

Smoky Quartz on Feldspar (Granite Pegmatite)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Rounded gray pebble (Indeterminate; likely a water-worn silicate or carbonate pebble) — sedimentary

Rounded gray pebble

Indeterminate; likely a water-worn silicate or carbonate pebble

Quartz (Herkimer Diamond variant) (Silicon Dioxide (SiO2)) — mineral

Quartz (Herkimer Diamond variant)

Silicon Dioxide (SiO2)

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

Amethyst (Purple Quartz)

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz with Hematite inclusions (Silicon Dioxide (SiO2) with Fe2O3 inclusions) — mineral

Smoky Quartz with Hematite inclusions

Silicon Dioxide (SiO2) with Fe2O3 inclusions

Red Sandstone (Sedimentary Clastic Rock (Quartz Arenite)) — sedimentary

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Sandstone (Quartzite-rich Pebble) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzite-rich Pebble)

Arenite (primarily SiO2)

Quartz (specifically Citrine or Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (specifically Citrine or Yellow Quartz)

Silicon Dioxide (SiO2)

Amethyst Elestial Quartz (Silicon Dioxide with inclusions (SiO2)) — mineral

Amethyst Elestial Quartz

Silicon Dioxide with inclusions (SiO2)

Tumbled Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Tumbled Amethyst

Silicon Dioxide (SiO2) with iron impurities

Dyed Blue Agate Slice (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Dyed Blue Agate Slice

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Iron Slag (Anthropogenic Vitreous Silicate (Byproduct of Smelting)) — Mineral-like byproduct

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Mineral-like byproduct

Amethyst (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Quartz Geode (Citrine or Iron-stained Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Yellow Chalcedony (Agate or Citrine Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Chalcedony (Agate or Citrine Quartz)

Silicon Dioxide (SiO2)

Scoria (Vesicular Mafic Igneous Rock) — igneous

Scoria

Vesicular Mafic Igneous Rock