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

Quartzite (Quartzite (composed primarily of silica, SiO2)) — metamorphic

Quartzite

Quartzite (composed primarily of silica, SiO2)

Shale with Coprolite influence (Argillaceous sedimentary rock (Shale/Mudstone)) — sedimentary

Shale with Coprolite influence

Argillaceous sedimentary rock (Shale/Mudstone)

Yellow Ochre / Limonite (FeO(OH)·nH2O (Hydrated Iron Oxide Mix)) — mineral

Yellow Ochre / Limonite

FeO(OH)·nH2O (Hydrated Iron Oxide Mix)

Smoky Quartz (Smoky Quartz (SiO2: Silicon Dioxide)) — mineral

Smoky Quartz

Smoky Quartz (SiO2: Silicon Dioxide)

Limonite with Hematite (Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)) — mineral

Limonite with Hematite

Hydrated Iron(III) Oxide-Hydroxide (FeO(OH)·nH2O)

Citrine (SiO2 (Silicon Dioxide)) — mineral

Citrine

SiO2 (Silicon Dioxide)

Smoky Quartz (Silicon Dioxide (SiO2) with aluminum impurities) — mineral

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Sandstone (Arenite (SiO2 primarily)) — sedimentary

Sandstone

Arenite (SiO2 primarily)

Limonite (Iron Ore) (FeO(OH)·nH2O) — mineral

Limonite (Iron Ore)

FeO(OH)·nH2O

Turquoise (Blue Howlite / Magnesite imitation) (CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)) — mineral

Turquoise (Blue Howlite / Magnesite imitation)

CuAl6(PO4)4(OH)8·4H2O (for natural Turquoise); Ca2B5SiO9(OH)5 (for Howlite)

Blue chalcedony (likely dyed or polished) (Chalcedony, microcrystalline quartz (SiO₂)) — mineral

Blue chalcedony (likely dyed or polished)

Chalcedony, microcrystalline quartz (SiO₂)

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

Green Aventurine

Quartz with Fuchsite inclusions (SiO2)

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

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

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

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Quartz Geode (Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz Geode (Chalcedony)

Silicon Dioxide (SiO2)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Sandstone (Arenite (primarily SiO2)) — sedimentary

Sandstone

Arenite (primarily SiO2)

Blue Dyed Agate Geode (Slice) (Silicon Dioxide (SiO2) - Chalcedony / Quartz) — mineral

Blue Dyed Agate Geode (Slice)

Silicon Dioxide (SiO2) - Chalcedony / Quartz

Black Obsidian (Obsidian, volcanic glass (Amorphous SiO₂)) — Igneous Rock

Black Obsidian

Obsidian, volcanic glass (Amorphous SiO₂)

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

Quartz (Citrine or Iron-Stained)

Silicon Dioxide (SiO2)

Tektite (likely indochinite) (Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium) — mineral

Tektite (likely indochinite)

Natural silica-rich impact glass; predominantly amorphous SiO₂ with aluminum, iron, magnesium, calcium, and sodium

Citrine (Citrine (Silicon Dioxide - SiO2)) — mineral

Citrine

Citrine (Silicon Dioxide - SiO2)

Asphalt (Road Aggregate) (Asphalt concrete / Bituminous mixture) — anthropogenic sedimentary (technolith)

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

anthropogenic sedimentary (technolith)

Chert (Arrowhead Artifact) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Arrowhead Artifact)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Tumbled smoky quartz with iron-stained inclusions (Quartz (SiO₂), likely smoky quartz variety) — mineral

Tumbled smoky quartz with iron-stained inclusions

Quartz (SiO₂), likely smoky quartz variety

Sandstone (Ferruginous) (Ferruginous Sandstone (SiO2 with Fe2O3)) — sedimentary

Sandstone (Ferruginous)

Ferruginous Sandstone (SiO2 with Fe2O3)

Diamond (in jewelry setting) (Cubic Carbon (C)) — mineral

Diamond (in jewelry setting)

Cubic Carbon (C)

Citrine (Silicon Dioxide (SiO2)) — mineral

Citrine

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

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

Citrine

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz Crystal (Silicon Dioxide (SiO2)) — mineral

Clear Quartz Crystal

Silicon Dioxide (SiO2)

Conglomerate (Asphaltic/Anthropogenic) (Clastic sedimentary rock / Bituminous mixture) — sedimentary

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz Geode (Silicon Dioxide (SiO2)) — mineral

Quartz Geode

Silicon Dioxide (SiO2)

Clear Quartz (Silicon dioxide (SiO2)) — mineral

Clear Quartz

Silicon dioxide (SiO2)

Howlite (Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)) — mineral

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Green Quartz (Aventurine) (Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)) — mineral

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

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

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Citrine Quartz (Silicon Dioxide (SiO2)) — mineral

Citrine Quartz

Silicon Dioxide (SiO2)