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

Chert (Yellow Jasper) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Yellow Jasper)

Microcrystalline Quartz (SiO2)

Polished black agate slice (Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining) — mineral

Polished black agate slice

Chalcedony (microcrystalline quartz), SiO₂, with iron/manganese staining

Tumbled black-and-white banded stone, likely onyx or agate (Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx) — mineral

Tumbled black-and-white banded stone, likely onyx or agate

Cryptocrystalline quartz (SiO₂), probably banded chalcedony/onyx

Sandstone (Clastic Sedimentary Rock) — sedimentary

Sandstone

Clastic Sedimentary Rock

Dyed blue quartz or druzy geode (likely) (Quartz, silicon dioxide (SiO₂), probably artificially colored) — mineral

Dyed blue quartz or druzy geode (likely)

Quartz, silicon dioxide (SiO₂), probably artificially colored

Tumbled pink quartz (probable rose quartz) (Quartz, silicon dioxide (SiO₂), likely rose quartz) — mineral

Tumbled pink quartz (probable rose quartz)

Quartz, silicon dioxide (SiO₂), likely rose quartz

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

Citrine

Silicon Dioxide with iron impurities (SiO2)

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

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Pearl (Biogenic CaCO3 (Aragonite and Calcite)) — mineral

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Tumbled amber-colored chalcedony or jasper (Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper) — mineral

Tumbled amber-colored chalcedony or jasper

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

Polished carnelian agate (Chalcedony (microcrystalline quartz), SiO₂, orange iron-oxide variety) — gemstone

Polished carnelian agate

Chalcedony (microcrystalline quartz), SiO₂, orange iron-oxide variety

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone) (Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)) — mineral (synthetic)

Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)

Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)

mineral (synthetic)

Yellow Quartz / Chalcedony (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz / Chalcedony

Silicon Dioxide (SiO2)

Banded Chert / Flint (Silicon dioxide (SiO2)) — sedimentary

Banded Chert / Flint

Silicon dioxide (SiO2)

Quartz (Water-worn pebble) (Silicon Dioxide (SiO2)) — mineral

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Sandstone (specifically Arkose or Quartz Arenite) (Arenite (primarily SiO2 with possible Feldspar)) — sedimentary

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Pegmatitic pink feldspar–quartz rock (Granitic pegmatite; chiefly microcline/orthoclase feldspar (KAlSi₃O₈), quartz (SiO₂), and minor mica) — igneous

Pegmatitic pink feldspar–quartz rock

Granitic pegmatite; chiefly microcline/orthoclase feldspar (KAlSi₃O₈), quartz (SiO₂), and minor mica

Quartzite (Quartzite (SiO2)) — metamorphic

Quartzite

Quartzite (SiO2)

Chert (Flint) (Microcrystalline Quartz (SiO2)) — sedimentary

Chert (Flint)

Microcrystalline Quartz (SiO2)

Pearl (Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3) — gemstone

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Clear Quartz (Faceted) (Silicon Dioxide (SiO2)) — gemstone

Clear Quartz (Faceted)

Silicon Dioxide (SiO2)

Sandstone (Quartz Sandstone) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartz Sandstone)

Clastic sedimentary rock (primarily SiO2)

Smoky Quartz Cluster (Smoky Quartz (Silicon Dioxide - SiO2)) — mineral

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Yellow Quartz (Citrine type/Tumbled Quartz) (Silicon Dioxide (SiO2)) — mineral

Yellow Quartz (Citrine type/Tumbled Quartz)

Silicon Dioxide (SiO2)

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

Milky quartz (likely)

Quartz, silicon dioxide (SiO₂)

Crackle Quartz (Dyed) (SiO2 (Silicon Dioxide) - Treated) — mineral

Crackle Quartz (Dyed)

SiO2 (Silicon Dioxide) - Treated

Smoky quartz (likely) (Quartz, silicon dioxide (SiO₂)) — mineral

Smoky quartz (likely)

Quartz, silicon dioxide (SiO₂)

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

Blue Topaz

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

Smoky Quartz occurring with Feldspar (Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)) — mineral

Smoky Quartz occurring with Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Yellow Quartz (Iron-stained Quartz) (Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities) — mineral

Yellow Quartz (Iron-stained Quartz)

Quartz (Silicon Dioxide, SiO2) with Hematite/Limonite impurities

Pumice (Pumice (a highly vesicular extrusive igneous rock)) — igneous

Pumice

Pumice (a highly vesicular extrusive igneous rock)

Citrine-bearing quartz cluster (Quartz, silicon dioxide (SiO₂), with iron-related yellow coloration) — mineral

Citrine-bearing quartz cluster

Quartz, silicon dioxide (SiO₂), with iron-related yellow coloration

Chalcedony Pebble (Silicon Dioxide (SiO2)) — mineral

Chalcedony Pebble

Silicon Dioxide (SiO2)

Granite (Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)) — igneous

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

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

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Quartzose) (Clastic sedimentary rock (primarily SiO2)) — sedimentary

Sandstone (Quartzose)

Clastic sedimentary rock (primarily SiO2)

Quartzite (Quartzite (primarily SiO2)) — metamorphic

Quartzite

Quartzite (primarily SiO2)

Smoky Quartz (Smoky Quartz (SiO2)) — mineral

Smoky Quartz

Smoky Quartz (SiO2)

Blue Sapphire (Corundum (Al2O3 with trace amounts of iron and titanium)) — mineral

Blue Sapphire

Corundum (Al2O3 with trace amounts of iron and titanium)

Blue Topaz (Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)) — mineral

Blue Topaz

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