Rock Identifier

Category

Mineral Like (Natural Glass)

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

Learn about Mineral Like (Natural Glass) in the encyclopedia

Obsidian

Black Obsidian

Macusanite

Baddeleyite

Green Obsidian

Blue Obsidian

Maskelynite

Midnight Obsidian

Sideromelane

Yellow-Green Obsidian

Yellow-Green Obsidian

Pink Obsidian

Perlite

Quartz (likely Herkimer Diamond style) (Silicon Dioxide (SiO2)) — mineral

Quartz (likely Herkimer Diamond style)

Silicon Dioxide (SiO2)

River Rock (Polished Siliceous Rock / Quartzite Pebble) — sedimentary

River Rock

Polished Siliceous Rock / Quartzite Pebble

Diorite (Diorite (Intermediate intrusive igneous rock)) — igneous

Diorite

Diorite (Intermediate intrusive igneous rock)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky) (Silicon Dioxide (SiO2)) — mineral

Quartz (Smoky/Milky)

Silicon Dioxide (SiO2)

Diamond (Cubic Carbon (C)) — mineral

Diamond

Cubic Carbon (C)

Ruby (Corundum (Al2O3)) — gemstone

Ruby

Corundum (Al2O3)

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

Yellow Quartz or Citrine

Silicon Dioxide (SiO2)

Green Aventurine (SiO2 (Quartz) with inclusions of Fuchsite) — metamorphic

Green Aventurine

SiO2 (Quartz) with inclusions of Fuchsite

Quartzite with Iron inclusions (Quartzite (SiO2 with Fe2O3 trace impurities)) — metamorphic

Quartzite with Iron inclusions

Quartzite (SiO2 with Fe2O3 trace impurities)

Rutilated Quartz (Quartz (SiO2) with Rutile inclusions (TiO2)) — Mineral

Rutilated Quartz

Quartz (SiO2) with Rutile inclusions (TiO2)

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Asphalt Concrete (Bituminous conglomerate) — sedimentary

Asphalt Concrete

Bituminous conglomerate

Aventurine (Green Quartz) (Silicon Dioxide (SiO2) with Fuchsite inclusions) — mineral

Aventurine (Green Quartz)

Silicon Dioxide (SiO2) with Fuchsite inclusions

Dyed Blue Quartz (Silicon Dioxide (SiO2) with artificial pigment) — mineral

Dyed Blue Quartz

Silicon Dioxide (SiO2) with artificial pigment

Pearl (Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)) — mineral

Pearl

Calcium carbonate (CaCO3) + organic conchiolin (Biogenic Mineral)

Glauconite (Greensand) (Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2) — sedimentary

Glauconite (Greensand)

Glauconite (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2

Sapphire (Corundum (Al2O3)) — mineral

Sapphire

Corundum (Al2O3)

Quartz (Citrine or Iron-Stained variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Sandstone (Iron-stained) (Clastic sedimentary rock (SiO2 with Fe2O3 staining)) — sedimentary

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Silicon Carbide (Carborundum) (Silicon Carbide (SiC) / Moissanite (natural)) — mineral

Silicon Carbide (Carborundum)

Silicon Carbide (SiC) / Moissanite (natural)

Painted Rock / Geode Specimen (Silicon Dioxide with artificial pigment coating) — mineral

Painted Rock / Geode Specimen

Silicon Dioxide with artificial pigment coating

Opalite (Synthetic Glass (typically Silica/Magnesium based with metal additives)) — mineral

Opalite

Synthetic Glass (typically Silica/Magnesium based with metal additives)

Citrine Quartz (Silicon Dioxide (SiO2) with iron impurities) — mineral

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Parti Sapphire (Corundum (Al2O3)) — mineral

Parti Sapphire

Corundum (Al2O3)

Kimberlite with Diamonds (Kimberlite (ultramafic potassic igneous rock)) — igneous

Kimberlite with Diamonds

Kimberlite (ultramafic potassic igneous rock)

Tumbled white quartz pebble (Quartz (silicon dioxide, SiO₂), possibly milky quartz) — mineral

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Dyed Howlite (simulating Lavender/Purple Jade or Charoite) (Howlite: Ca2B5SiO9(OH)5 (when natural)) — Mineral

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Diamond (Natural Diamond (Carbon, C)) — gemstone

Diamond

Natural Diamond (Carbon, C)

Clear quartz crystal sphere (Quartz (silicon dioxide, SiO₂)) — mineral

Clear quartz crystal sphere

Quartz (silicon dioxide, SiO₂)

Tumbled yellow chalcedony (likely citrine or yellow jasper) (Microcrystalline quartz, SiO₂; exact identification is uncertain from the photograph) — mineral

Tumbled yellow chalcedony (likely citrine or yellow jasper)

Microcrystalline quartz, SiO₂; exact identification is uncertain from the photograph

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

Rough Amethyst

Silicon Dioxide (SiO2) with iron impurities

Granite Cobble / Gneiss (River Rock) (Granitic Gneiss / Felsic Igneous Rock) — igneous

Granite Cobble / Gneiss (River Rock)

Granitic Gneiss / Felsic Igneous Rock

Red Coral (Precious Coral) (Corallium rubrum (Calcium Carbonate, CaCO3)) — sedimentary

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Dalmation Stone (Dalmation Jasper) (Peralkaline Rock with Feldspar and Arfvedsonite) — igneous

Dalmation Stone (Dalmation Jasper)

Peralkaline Rock with Feldspar and Arfvedsonite

Red Sandstone (Arenite (Ferruginous Sandstone)) — sedimentary

Red Sandstone

Arenite (Ferruginous Sandstone)

Amygdaloidal Basalt (Basalt with secondary mineral infilling) — igneous

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Black Sapphire (Basaltic Blue Sapphire) (Corundum (Al2O3)) — mineral

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Green Aventurine (SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)) — mineral

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)