Rock Identifier

Category

Tektite (Natural Glass)

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

Learn about Tektite (Natural Glass) in the encyclopedia

Macusanite

Moldavite

Obsidian

Black Obsidian

Green Obsidian

Blue Obsidian

Midnight Obsidian

Maskelynite

Pink Obsidian

Purple Obsidian

Purple Obsidian

Teal Obsidian

Yellow-Green Obsidian

Yellow-Green Obsidian

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

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

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

Citrine (Yellow Quartz)

Silicon Dioxide (SiO2)

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

Yellow Quartz (Golden Quartz)

Silicon Dioxide (SiO2)

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

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Milky and Smoky Quartz Cobble (Silicon Dioxide (SiO2)) — mineral

Milky and Smoky Quartz Cobble

Silicon Dioxide (SiO2)

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Arenite (SiO2 based)) — sedimentary

Sandstone

Arenite (SiO2 based)

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

Yellow Quartz (Citrine or Yellow Jasper)

Silicon Dioxide (SiO2)

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

Citrine (Silicon dioxide (SiO2)) — mineral

Citrine

Silicon dioxide (SiO2)

Tumbled blue stone, likely blue aventurine or dyed quartz (Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing) — mineral

Tumbled blue stone, likely blue aventurine or dyed quartz

Quartz (SiO₂), possibly with fuchsite inclusions; exact identification requires testing

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

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Arenite (SiO2 secondary)) — sedimentary

Sandstone

Arenite (SiO2 secondary)

Picture Jasper (Silicified sedimentary or volcanic rock (primarily SiO2)) — sedimentary

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Yellow jasper or polished yellow chalcedony (Microcrystalline quartz, SiO₂, likely iron-stained jasper/chalcedony) — mineral

Yellow jasper or polished yellow chalcedony

Microcrystalline quartz, SiO₂, likely iron-stained jasper/chalcedony

Quartz Crystal (specifically a Double-Terminated variety) (Silicon Dioxide (SiO2) - Low Quartz) — mineral

Quartz Crystal (specifically a Double-Terminated variety)

Silicon Dioxide (SiO2) - Low Quartz

Milky Quartz Geode / Chalcedony Nodule (Quartz (Silicon Dioxide - SiO2)) — mineral

Milky Quartz Geode / Chalcedony Nodule

Quartz (Silicon Dioxide - SiO2)

Smoky quartz (Quartz, silicon dioxide (SiO₂), brown to gray variety) — mineral

Smoky quartz

Quartz, silicon dioxide (SiO₂), brown to gray variety

Diamond (or Cut Clear Gemstone) (C (Native Carbon)) — gemstone

Diamond (or Cut Clear Gemstone)

C (Native Carbon)

Amethyst stalactite slice pendant (Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding) — mineral

Amethyst stalactite slice pendant

Amethyst (紫 quartz), SiO₂, with concentric quartz/chalcedony and likely agate banding

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

Citrine Quartz

Citrine (Silicon Dioxide, SiO2)

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

Quartz (Citrine variety)

Silicon Dioxide (SiO2)

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

Sandstone

Arenite (composed primarily of SiO2)

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

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Rounded pebble, likely quartz-rich sandstone or chert (Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)) — sedimentary

Rounded pebble, likely quartz-rich sandstone or chert

Indeterminate lithic clast; possibly quartz arenite or microcrystalline quartz (SiO₂)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Smoky Quartz (SiO2 (Silicon Dioxide)) — mineral

Smoky Quartz

SiO2 (Silicon Dioxide)

Dyed Agate (Tumbled) (Silicon Dioxide (Chalcedony variety, artificially dyed)) — gemstone

Dyed Agate (Tumbled)

Silicon Dioxide (Chalcedony variety, artificially dyed)

Chert / Flint Nodular Fragment (Microcrystalline quartz (SiO2)) — sedimentary

Chert / Flint Nodular Fragment

Microcrystalline quartz (SiO2)

Diamond (C (Pure Carbon)) — gemstone

Diamond

C (Pure Carbon)

Quartz (Yellow/Citrine variety) (Silicon Dioxide (SiO2)) — mineral

Quartz (Yellow/Citrine variety)

Silicon Dioxide (SiO2)

Bull Quartz with Mica and Host Rock (Massive Quartz (SiO2) with Muscovite/Chlorite inclusions) — igneous

Bull Quartz with Mica and Host Rock

Massive Quartz (SiO2) with Muscovite/Chlorite inclusions

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

Chert (Flint)

Silicon Dioxide (SiO2)

Carborundum (Silicon Carbide (SiC)) — mineral

Carborundum

Silicon Carbide (SiC)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst (Faceted) (Quartz (SiO2) with iron impurities) — Mineral

Amethyst (Faceted)

Quartz (SiO2) with iron impurities

Amethyst (Variety of Quartz) (Silicon Dioxide (SiO2) with iron impurities) — mineral

Amethyst (Variety of Quartz)

Silicon Dioxide (SiO2) with iron impurities

Almandine Garnet & Tumbled Citrine Quartz (Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)) — mineral

Almandine Garnet & Tumbled Citrine Quartz

Fe3Al2(SiO4)3 (Garnet) and SiO2 (Quartz)