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

Hag Stone (Flint / Chert / Limestone concretion with a natural hole) — sedimentary

Hag Stone

Flint / Chert / Limestone concretion with a natural hole

Granite (Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)

Obsidian (Volcanic Glass (SiO2 - Silicon Dioxide with impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 - Silicon Dioxide with impurities)

Amethyst Lace Agate / Banded Amethyst (Silicon Dioxide (SiO2) with Fe3+ impurities) — mineral

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Black Onyx or Dyed Agate Node (Cryptocrystalline Quartz (SiO2)) — mineral

Black Onyx or Dyed Agate Node

Cryptocrystalline Quartz (SiO2)

Banded Agate (Botswana Agate) (Silicon Dioxide (SiO2)) — mineral

Banded Agate (Botswana Agate)

Silicon Dioxide (SiO2)

River Quartzite Siltstone (Quartz-rich Meta-siltstone (SiO2 dominated)) — metamorphic

River Quartzite Siltstone

Quartz-rich Meta-siltstone (SiO2 dominated)

Vesicular Basalt (Vesicular Basalt (Mafic Volcanic Rock)) — igneous

Vesicular Basalt

Vesicular Basalt (Mafic Volcanic Rock)

Red Jasper (with Quartz and Chert) (Silicon Dioxide (SiO2) with Iron Oxide inclusions) — sedimentary

Red Jasper (with Quartz and Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Red Jasper (Chert) (Silicon Dioxide (SiO2) with iron oxide inclusions) — sedimentary

Red Jasper (Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Fluorite and Mineral Collection (Calcium Fluoride (CaF2)) — mineral

Fluorite and Mineral Collection

Calcium Fluoride (CaF2)

Gold Nugget (Native Gold (Au)) — mineral

Gold Nugget

Native Gold (Au)

Opal (Hydrated Amorphous Silica (SiO2·nH2O)) — mineral

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

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

Diamond (or Simulant)

Carbon (C)

Granite (Granite (phaneritic intrusive felsic igneous rock)) — igneous

Granite

Granite (phaneritic intrusive felsic igneous rock)

Chalcedony (Jasper/Agate mix) (Quartz (microcrystalline SiO2)) — sedimentary

Chalcedony (Jasper/Agate mix)

Quartz (microcrystalline SiO2)

Black Tourmaline (Schorl) (NaFe3Al6(BO3)3Si6O18(OH)4) — Mineral

Black Tourmaline (Schorl)

NaFe3Al6(BO3)3Si6O18(OH)4

Rainbow aura quartz cluster (Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film) — mineral

Rainbow aura quartz cluster

Quartz, silicon dioxide (SiO₂), artificially coated with a thin metallic film

Muscovite Mica (Muscovite (KAl2(AlSi3O10)(F,OH)2)) — mineral

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(F,OH)2)

Muscovite Mica (with Quartz) (Muscovite (KAl2(AlSi3O10)(OH)2)) — mineral

Muscovite Mica (with Quartz)

Muscovite (KAl2(AlSi3O10)(OH)2)

Glauconitic Sandstone (Greensand) (Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)) — sedimentary

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Snowflake Obsidian (Volcanic Glass with Spherulitic Cristobalite (SiO2)) — igneous

Snowflake Obsidian

Volcanic Glass with Spherulitic Cristobalite (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Terrazzo flooring containing marble aggregate (Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo) — metamorphic

Terrazzo flooring containing marble aggregate

Marble (recrystallized calcite, CaCO₃) aggregate in cementitious terrazzo

Likely iron-rich slag or weathered ironstone (Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag) — mineral

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Blue Glass or Slag Glass (Amorphous Silica (Anthropogenic Glass)) — mineral

Blue Glass or Slag Glass

Amorphous Silica (Anthropogenic Glass)

Smoky Quartz (SiO2 (Silicon Dioxide)) — Mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Dyed Blue Quartzite (SiO2 (Silicon Dioxide) with artificial colorants) — metamorphic

Dyed Blue Quartzite

SiO2 (Silicon Dioxide) with artificial colorants

Obsidian with Matrix (Volcanic Glass (SiO2)) — igneous

Obsidian with Matrix

Volcanic Glass (SiO2)

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

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Dragon Vein Agate (Dyed/Treated) (Agate (SiO2)) — mineral

Dragon Vein Agate (Dyed/Treated)

Agate (SiO2)

Amethyst Geode (Amethyst (Silicon Dioxide), Formula: SiO2) — mineral

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Quartzite Pebble (Metamorphic Quartz-rich Rock) — metamorphic

Quartzite Pebble

Metamorphic Quartz-rich Rock

Yellow Jasper (Silicon Dioxide (SiO2) with iron hydroxides) — sedimentary

Yellow Jasper

Silicon Dioxide (SiO2) with iron hydroxides

Citrine Quartz (Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities) — mineral

Citrine Quartz

Crystalline Silicon Dioxide (SiO2) with Ferric Iron impurities

Cobalt Glass Slug (Man-made Glass) (Amorphous Silica with Cobalt Oxide (SiO2 + CoO)) — mineraloid

Cobalt Glass Slug (Man-made Glass)

Amorphous Silica with Cobalt Oxide (SiO2 + CoO)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)

Fluorite (Rainbow Fluorite Point) (Calcium Fluoride (CaF2)) — mineral

Fluorite (Rainbow Fluorite Point)

Calcium Fluoride (CaF2)

Orthoclase Feldspar (Orthoclase (KAlSi3O8)) — mineral

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Granite (Intrusive Felsic Igneous Rock) — igneous

Granite

Intrusive Felsic Igneous Rock

Quartzite River Rock (Quartzite (primarily SiO2)) — metamorphic

Quartzite River Rock

Quartzite (primarily SiO2)