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

Red Howlite (Dyed) (Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye) — mineral

Red Howlite (Dyed)

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5) with Red Dye

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amber (Fossilized Tree Resin (Succinate)) — mineral

Amber

Fossilized Tree Resin (Succinate)

Amethyst cluster (Quartz, SiO₂, violet variety (amethyst)) — mineral

Amethyst cluster

Quartz, SiO₂, violet variety (amethyst)

Chert (Flint Nodule) (Silicon Dioxide (SiO2)) — sedimentary

Chert (Flint Nodule)

Silicon Dioxide (SiO2)

Celestine (Celestite) (Strontium sulfate (SrSO4)) — mineral

Celestine (Celestite)

Strontium sulfate (SrSO4)

Blue Quartzite (Dyed) (Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)) — metamorphic

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Limonite/Ironstone (Limonite (Hydrous ferric oxides), FeO(OH)·nH2O) — sedimentary

Limonite/Ironstone

Limonite (Hydrous ferric oxides), FeO(OH)·nH2O

Bornite (Bornite (Cu5FeS4)) — mineral

Bornite

Bornite (Cu5FeS4)

Magnetite (Loadstone candidate) (Iron(II,III) oxide (Fe3O4)) — mineral

Magnetite (Loadstone candidate)

Iron(II,III) oxide (Fe3O4)

Blue Quartzite (Aventurine variety) (Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite) — metamorphic

Blue Quartzite (Aventurine variety)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite (Granite (Phaneritic Acid Igneous Rock)) — igneous

Granite

Granite (Phaneritic Acid Igneous Rock)

Dyed Blue Agate Slice (Silicon Dioxide (SiO2)) — mineral

Dyed Blue Agate Slice

Silicon Dioxide (SiO2)

Pink Tourmaline in Quartz Matrix (Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)) — mineral

Pink Tourmaline in Quartz Matrix

Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)

Native Copper with Malachite and Chrysocolla (Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]) — mineral

Native Copper with Malachite and Chrysocolla

Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]

Tumbled blue-gray mineral specimen (Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone) — mineral

Tumbled blue-gray mineral specimen

Indeterminate; possibly dumortierite quartz, sodalite, or dyed stone

Ruby (varieties of Corundum) (Aluminum oxide (Al2O3) with Chromium traces) — mineral

Ruby (varieties of Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Ferruginous Slag (Iron Smelting Byproduct) (Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)) — Antropogenic Glass / Mineraloid

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Antropogenic Glass / Mineraloid

Sandstone (Arenite (CaCO3/SiO2 cemented quartz)) — sedimentary

Sandstone

Arenite (CaCO3/SiO2 cemented quartz)

Placer Gold Nugget (Native Gold (Au)) — mineral

Placer Gold Nugget

Native Gold (Au)

Shale (Laminated Mudstone (Shale)) — sedimentary

Shale

Laminated Mudstone (Shale)

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

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Fluorite (Rainbow, Purple-Blue Tumbled) (Calcium Fluoride (CaF2)) — Mineral

Fluorite (Rainbow, Purple-Blue Tumbled)

Calcium Fluoride (CaF2)

Tumbled white quartz or quartzite pebble (Quartz (SiO₂), possibly massive quartzite) — mineral

Tumbled white quartz or quartzite pebble

Quartz (SiO₂), possibly massive quartzite

River Pebble (Siltstone / Fine-grained Sandstone) (Sedimentary Pebble (Siliclastic)) — sedimentary

River Pebble (Siltstone / Fine-grained Sandstone)

Sedimentary Pebble (Siliclastic)

Fulgurite (Lechatelierite (vitreous silica / silica glass)) — mineral

Fulgurite

Lechatelierite (vitreous silica / silica glass)

Tumbled Purple Agate (Silicon Dioxide (SiO2) - Chalcedony variety) — mineral

Tumbled Purple Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Granite (Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)) — igneous

Granite

Granite (phaneritic intrusive igneous rock consisting mainly of quartz, alkali feldspar, and plagioclase)

Black Chert (Flint) (Silicon Dioxide (SiO2)) — sedimentary

Black Chert (Flint)

Silicon Dioxide (SiO2)

Beryl (Emerald variety in host rock) (Be3Al2(SiO3)6 (Silicate mineral)) — mineral

Beryl (Emerald variety in host rock)

Be3Al2(SiO3)6 (Silicate mineral)

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

Milky quartz

Quartz, silicon dioxide (SiO₂)

Rounded river pebble (Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock) — sedimentary

Rounded river pebble

Indeterminate; likely quartz-rich sandstone, chert, or weathered volcanic rock

Hematite (Iron(III) oxide (Fe2O3)) — mineral

Hematite

Iron(III) oxide (Fe2O3)

Citrine and Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine and Quartz

Silicon Dioxide (SiO2)

Emerald (Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities) — mineral

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities

Diamond (or Diamond Simulant) (C (Carbon) or synthetic equivalent) — gemstone

Diamond (or Diamond Simulant)

C (Carbon) or synthetic equivalent

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

Amethyst Cluster

Silicon Dioxide (SiO2) with iron impurities

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

Sandstone (Pebble)

Arenite (primarily SiO2)

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

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂)

Citrine (Heat-Treated Amethyst) (Silicon Dioxide (SiO2) with ferric iron impurities) — mineral

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2) with ferric iron impurities

Blue Agate (Dyed) (Silicon Dioxide (SiO2) - Variety of Chalcedony) — mineral

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Variety of Chalcedony