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

Pyrite (Iron Sulfide (FeS2)) — mineral

Pyrite

Iron Sulfide (FeS2)

Red Jasper (Silicon Dioxide (SiO2) - Microcrystalline Quartz) — sedimentary

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

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

Quartz Beach Pebble

Silicon Dioxide (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Iolite (Cordierite) (Cordierite (Mg2Al4Si5O18)) — gemstone

Iolite (Cordierite)

Cordierite (Mg2Al4Si5O18)

Quartz (Iron-Stained / Yellow Quartz) (Silicon Dioxide (SiO2)) — mineral

Quartz (Iron-Stained / Yellow Quartz)

Silicon Dioxide (SiO2)

Hematoid Quartz (Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)) — mineral

Hematoid Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Moss agate bracelet (Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions) — gemstone

Moss agate bracelet

Chalcedony (microcrystalline quartz, SiO₂) with chlorite/amphibole inclusions

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

Amethyst

Silicon dioxide with iron impurities (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

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

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Yellow Quartz (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz

Silicon Dioxide (SiO2)

Citrine (Heat-treated Amethyst) (Quartz (Silicon Dioxide, SiO2)) — mineral

Citrine (Heat-treated Amethyst)

Quartz (Silicon Dioxide, SiO2)

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

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Quartz Pebble (Chalcedony/Agate variety) (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

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

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Iron Slag (Anthropogenic Vitreous Silicate (Byproduct of Smelting)) — Mineral-like byproduct

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Mineral-like byproduct

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

Dyed Quartz Geode

Silicon Dioxide (SiO2) with artificial pigment

Granite (Granite (Phaneritic Igneous Rock)) — igneous

Granite

Granite (Phaneritic Igneous Rock)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Slag (Anthropogenic glassy silicate) — Mineral-like byproduct

Slag

Anthropogenic glassy silicate

Mineral-like byproduct

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Blue Crackle Quartz (Dyed Quarzite) (Silicon Dioxide (SiO2) with artificial dye) — Metamorphic (modified)

Blue Crackle Quartz (Dyed Quarzite)

Silicon Dioxide (SiO2) with artificial dye

Metamorphic (modified)

Chalcedony (Agate Pebble) (Silicon Dioxide (SiO2)) — mineral

Chalcedony (Agate Pebble)

Silicon Dioxide (SiO2)

Uncertain rounded gray stone (Possibly granite, gneiss, or a glacially transported granitoid) — igneous

Uncertain rounded gray stone

Possibly granite, gneiss, or a glacially transported granitoid

Pumice (Vesicular Lava) (Pumice) — igneous

Pumice (Vesicular Lava)

Pumice

Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite (Quartz–feldspar aggregate; identification is uncertain from the photograph) — igneous

Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite

Quartz–feldspar aggregate; identification is uncertain from the photograph

Tangerine Quartz (Silicon Dioxide (SiO2) with Hematite/Limonite coatings) — mineral

Tangerine Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite coatings

White Topaz (faceted) (Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)) — gemstone

White Topaz (faceted)

Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)

Citrine (Silicon Dioxide (SiO₂)) — mineral

Citrine

Silicon Dioxide (SiO₂)

Chert (Microcrystalline quartz (SiO2)) — sedimentary

Chert

Microcrystalline quartz (SiO2)

Jasper (Microcrystalline Quartz (SiO2)) — sedimentary

Jasper

Microcrystalline Quartz (SiO2)

Green Jasper (Silicon Dioxide (Microcrystalline Quartz, SiO2)) — sedimentary

Green Jasper

Silicon Dioxide (Microcrystalline Quartz, SiO2)

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

Milky Quartz Pebble (Tumbled Quartzite)

Silicon Dioxide (SiO2)

Jasper with Agate and Quartz Inclusions (Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate) — sedimentary

Jasper with Agate and Quartz Inclusions

Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate

Jasper (Jasper (Silicon Dioxide, SiO2)) — sedimentary

Jasper

Jasper (Silicon Dioxide, SiO2)

Red Jasper (Red Jasper (SiO2 with Fe2O3 inclusions)) — sedimentary

Red Jasper

Red Jasper (SiO2 with Fe2O3 inclusions)

Amethyst (Faceted Gemstone) (Silicon Dioxide (SiO2) with iron impurities) — gemstone

Amethyst (Faceted Gemstone)

Silicon Dioxide (SiO2) with iron impurities

Citrine (Heat-Treated Amethyst) (Quartz (SiO2)) — mineral

Citrine (Heat-Treated Amethyst)

Quartz (SiO2)

Blue Sapphire (Corundum (Al2O3)) — mineral

Blue Sapphire

Corundum (Al2O3)

Blue Crackle Quartz (Dyed Fire Agate/Quartz) (Silicon Dioxide (SiO2) with artificial dye treatment) — mineral

Blue Crackle Quartz (Dyed Fire Agate/Quartz)

Silicon Dioxide (SiO2) with artificial dye treatment