Rock Identifier

Category

Mineral (Man Made Glass)

Browse mineral (man made glass) specimens identified by the Rock Identifier community.

Learn about Mineral (Man Made Glass) in the encyclopedia

Opalite

Goldstone

Blue Goldstone

Sideromelane

Black Obsidian

Maskelynite

Tachylite

Obsidian

Map Jasper

Hyalite Opal

Perlite

Macusanite

Quartz (milky quartz), possibly calcite (Quartz: SiO₂; visual identification is uncertain because the specimen is wet and lacks diagnostic crystal faces) — mineral

Quartz (milky quartz), possibly calcite

Quartz: SiO₂; visual identification is uncertain because the specimen is wet and lacks diagnostic crystal faces

Quartz Pebble (Silicon Dioxide (SiO2)) — sedimentary

Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Arenite) — sedimentary

Sandstone

Arenite

Polished Mexican “Crazy Lace” agate tower (Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions) — mineral

Polished Mexican “Crazy Lace” agate tower

Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide inclusions

Sandstone (Sedimentary rock composed mainly of sand-sized minerals or rock grains) — sedimentary

Sandstone

Sedimentary rock composed mainly of sand-sized minerals or rock grains

Brown quartz-rich stone, possibly smoky quartz or quartzite (Quartz (SiO₂), potentially in a quartzite or silica-rich matrix) — mineral

Brown quartz-rich stone, possibly smoky quartz or quartzite

Quartz (SiO₂), potentially in a quartzite or silica-rich matrix

Small polished dark mineral or gemstone fragment (Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline) — mineral

Small polished dark mineral or gemstone fragment

Indeterminate; possibly smoky quartz, obsidian, or dark tourmaline

Sandstone (Sedimentary Rock (Quartz arenite)) — sedimentary

Sandstone

Sedimentary Rock (Quartz arenite)

Polished carnelian-rich agate (likely polyhedral jasper/chalcedony) (Microcrystalline quartz, SiO₂, with iron-oxide inclusions) — mineral

Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Quartz Sand / Sandstone grains (Silicon Dioxide (SiO2)) — sedimentary

Quartz Sand / Sandstone grains

Silicon Dioxide (SiO2)

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

Milky quartz crystal

Quartz, silicon dioxide (SiO₂)

Likely quartz crystal fragment (Quartz (SiO₂), possibly a small tumbled or cleaved fragment) — mineral

Likely quartz crystal fragment

Quartz (SiO₂), possibly a small tumbled or cleaved fragment

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Small Fragment) (Silicon Dioxide (SiO2)) — mineral

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Obsidian (in jewelry setting) (Volcanic Glass (Amorphous Silica)) — igneous

Obsidian (in jewelry setting)

Volcanic Glass (Amorphous Silica)

Weathered jasper/chert nodule (Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert) — sedimentary

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Quartz (Silicon dioxide (SiO2)) — mineral

Quartz

Silicon dioxide (SiO2)

Granite / Quartz Vein Rock (Granitoid with Quartz (SiO2)) — igneous

Granite / Quartz Vein Rock

Granitoid with Quartz (SiO2)

Milky Quartz with Iron Staining (Silicon Dioxide (SiO2)) — mineral

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Botryoidal Quartz (Silicon Dioxide (SiO2)) — mineral

Botryoidal Quartz

Silicon Dioxide (SiO2)

Quartz (Sunstone-like Chalcedony) (Silicon Dioxide (SiO2)) — mineral

Quartz (Sunstone-like Chalcedony)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Druzy (Silicon Dioxide (SiO2)) — mineral

Quartz Druzy

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

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

Milky quartz (likely quartzite or massive quartz)

Quartz, silicon dioxide (SiO₂)

Green Aventurine (Silicon Dioxide (SiO2) with Fuchsite inclusions) — gemstone

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Aventurine (SiO2 (Silicon Dioxide) with Fuchsite inclusions) — mineral

Green Aventurine

SiO2 (Silicon Dioxide) with Fuchsite inclusions

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

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Black Obsidian (Volcanic Glass (Silicon Dioxide with impurities)) — igneous

Black Obsidian

Volcanic Glass (Silicon Dioxide with impurities)

Green Aventurine (SiO2 (Silicon Dioxide with inclusions of Fuchsite)) — mineral

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite)

Black Obsidian (Obsidian (Volcanic Glass, SiO2 + impurities)) — igneous

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Aventurine Quartz (Silicon Dioxide (SiO2) with inclusions of Fuchsite mica) — mineral

Aventurine Quartz

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Obsidian (Volcanic glass (high silica SiO2)) — igneous

Obsidian

Volcanic glass (high silica SiO2)

Obsidian (Obsidian (volcanic glass), predominantly Silicon Dioxide (SiO2)) — igneous

Obsidian

Obsidian (volcanic glass), predominantly Silicon Dioxide (SiO2)

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chert (Flint variety) (Microcrystalline or cryptocrystalline Quartz (SiO2)) — sedimentary

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Quartz (River Pebble)

Silicon Dioxide (SiO2)