Rock Identifier

Category

Mineral Like (Natural Glass)

Browse mineral like (natural glass) specimens identified by the Rock Identifier community.

Obsidian (Volcanic glass (high silica SiO2)) — igneous

Obsidian

Volcanic glass (high silica SiO2)

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

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Quartz (Clear / Rock Crystal) (Silicon Dioxide (SiO2)) — Mineral

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Agate Geode (Chalcedony (cryptocrystalline SiO2)) — mineral

Agate Geode

Chalcedony (cryptocrystalline SiO2)

Sandstone (with Iron Staining) (Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone with Iron Staining (Clastic sedimentary rock (primarily SiO2 with Fe2O3)) — sedimentary

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Quartz fragment (Silicon Dioxide (SiO2)) — mineral

Quartz fragment

Silicon Dioxide (SiO2)

Yellow Quartz Pebble (SiO2 (Silicon Dioxide)) — mineral

Yellow Quartz Pebble

SiO2 (Silicon Dioxide)

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Quartz Pebble (Water-worn) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Water-worn)

Silicon Dioxide (SiO2)

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

Black Obsidian

Volcanic Glass (SiO2 + impurities)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Iron Slag (Industrial Byproduct) (Anthropogenic Vitrification Product/Ferrous Slag) — Mineral-like Industrial Smelting Waste

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Mineral-like Industrial Smelting Waste

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

Quartz (River Pebble) (Quartz (SiO₂ - Silicon Dioxide)) — Mineral

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Chert with Quartz/Calcite Vein (Microcrystalline Silica (SiO2)) — sedimentary

Chert with Quartz/Calcite Vein

Microcrystalline Silica (SiO2)

Apatite (Fluorapatite (Ca5(PO4)3F)) — mineral

Apatite

Fluorapatite (Ca5(PO4)3F)

Rose Quartz (SiO2 (Silicon Dioxide)) — mineral

Rose Quartz

SiO2 (Silicon Dioxide)

Sandstone (Ferruginous) (Arenite (composed primarily of SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Sandstone (Quartzose) (Arenite (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Chert (Chert (Microcrystalline Quartz, SiO2)) — sedimentary

Chert

Chert (Microcrystalline Quartz, SiO2)

Milky Quartz (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone/Quartzite (Sedimentary Rock (composed mainly of SiO2)) — sedimentary

Sandstone/Quartzite

Sedimentary Rock (composed mainly of SiO2)

Sandstone (Arenite (composed mainly of SiO2)) — sedimentary

Sandstone

Arenite (composed mainly of SiO2)

Sandstone (Ferruginous) (Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)) — sedimentary

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3/FeO(OH) cement)

Pyrite in Shale (Iron Disulfide (FeS2) in Sedimentary Shale) — mineral

Pyrite in Shale

Iron Disulfide (FeS2) in Sedimentary Shale

Ferruginous Conglomerate (Ferruginous Conglomerate (Clastic Sedimentary Rock)) — sedimentary

Ferruginous Conglomerate

Ferruginous Conglomerate (Clastic Sedimentary Rock)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (Phaneritic Felsic Igneous Rock) — igneous

Granite

Phaneritic Felsic Igneous Rock

Chert (Flint variety) (Microcrystalline or Cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Amethyst (Tumbled/Weathered Quartz) (Amethyst (SiO2 with iron impurities)) — mineral

Amethyst (Tumbled/Weathered Quartz)

Amethyst (SiO2 with iron impurities)

Chalcopyrite (Peacock Ore) (Chalcopyrite (CuFeS2)) — mineral

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Granite (Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)) — igneous

Granite

Granite (Alkali feldspar, Plagioclase feldspar, and Quartz)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Obsidian (Obsidian (Amorphous volcanic glass)) — igneous

Obsidian

Obsidian (Amorphous volcanic glass)

Orthoclase Feldspar (Orthoclase (KAlSi₃O₈)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Sandstone (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone

Clastic sedimentary rock (primarily SiO2)

Limonite (Ironstone) (Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)) — mineral

Limonite (Ironstone)

Limonite (Hydrated iron(III) oxide-hydroxide, FeO(OH)·nH2O)

Scoria (Lava Rock) (Vesicular Basalt / Scoria) — igneous

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Feldspar (Orthoclase) (Potassium Alveolar Silicate (KAlSi3O8)) — mineral

Feldspar (Orthoclase)

Potassium Alveolar Silicate (KAlSi3O8)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)