Rock Identifier

Category

Mineral And Glass

Browse mineral and glass specimens identified by the Rock Identifier community.

Learn about Mineral And Glass in the encyclopedia

Sideromelane

Black Obsidian

Maskelynite

Tachylite

Obsidian

Hyalite Opal

Perlite

Opalite

Macusanite

Pink Obsidian

Goldstone

Glauconite

Milky Quartz (Silicon Dioxide (SiO2)) — mineral

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite (Quartzite (Primary mineral: SiO2)) — metamorphic

Quartzite

Quartzite (Primary mineral: SiO2)

Aventurine (Tan/Cream colored) (Quartz (SiO2) with mineral inclusions) — mineral

Aventurine (Tan/Cream colored)

Quartz (SiO2) with mineral inclusions

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

Quartz (Small Pebble)

Silicon Dioxide (SiO2)

Calcite with Quartz coating (Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)) — mineral

Calcite with Quartz coating

Calcium Carbonate (CaCO3) with Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, possibly blue quartz or granite (Quartz (SiO₂), with probable feldspar and dark accessory minerals) — mineral

Tumbled quartz-rich stone, possibly blue quartz or granite

Quartz (SiO₂), with probable feldspar and dark accessory minerals

Obsidian (Obsidian (Volcanic Glass, primarily SiO2)) — igneous

Obsidian

Obsidian (Volcanic Glass, primarily SiO2)

Granitoid (Pegmatitic Granite) (Granitoid with dominant Potassium Feldspar and Quartz) — igneous

Granitoid (Pegmatitic Granite)

Granitoid with dominant Potassium Feldspar and Quartz

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Opalite (Synthetic Opalized Glass) — gemstone

Opalite

Synthetic Opalized Glass

Quartz (with probable host rock) (Silicon Dioxide (SiO2)) — mineral

Quartz (with probable host rock)

Silicon Dioxide (SiO2)

Smoky Quartz (Silicon Dioxide (SiO2)) — mineral

Smoky Quartz

Silicon Dioxide (SiO2)

Obsidian (likely blue-sheen or coated obsidian) (Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)) — igneous

Obsidian (likely blue-sheen or coated obsidian)

Volcanic glass; primarily rhyolitic silica glass (SiO₂-rich, noncrystalline)

Quartz with inclusions (SiO2) — mineral

Quartz with inclusions

SiO2

Clear Quartz (Silicon Dioxide (SiO2)) — mineral

Clear Quartz

Silicon Dioxide (SiO2)

Sapphire (Raw/Rough) (Corundum (Al2O3)) — mineral

Sapphire (Raw/Rough)

Corundum (Al2O3)

Obsidian (Obsidian (Volcanic Glass)) — igneous

Obsidian

Obsidian (Volcanic Glass)

Obsidian (Black Obsidian) (Obsidian (Volcanic Glass)) — igneous

Obsidian (Black Obsidian)

Obsidian (Volcanic Glass)

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

River Quartz Cobble

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

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

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Fulgurite (Fulgurite (Lechatelierite)) — metamorphic

Fulgurite

Fulgurite (Lechatelierite)

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

Sandstone

Arenite (primarily composed of SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Iron Staining (Silicon Dioxide (SiO2) with Ferruginous Oxides) — mineral

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Ferruginous Oxides

Jasper with Quartz Vein (Silicon Dioxide (SiO2)) — sedimentary

Jasper with Quartz Vein

Silicon Dioxide (SiO2)

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

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Green Aventurine (Tumbled) (Silicon Dioxide (Quartz with inclusions, SiO2)) — mineral

Green Aventurine (Tumbled)

Silicon Dioxide (Quartz with inclusions, SiO2)

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

Quartz (Smoky Quartz)

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein Rock (Silicon Dioxide (SiO2)) — mineral

Quartz Vein Rock

Silicon Dioxide (SiO2)

Quartz (Silicon Dioxide (SiO2)) — mineral

Quartz

Silicon Dioxide (SiO2)

Quartz Pebble (Silicon Dioxide (SiO2)) — mineral

Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

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

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Obsidian (Volcanic Glass (SiO2 with impurities)) — igneous

Obsidian

Volcanic Glass (SiO2 with impurities)

Sandstone (Sandstone (Sedimentary rock composed of silicate grains)) — sedimentary

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Sandstone (Arenite (SiO2 predominantly)) — sedimentary

Sandstone

Arenite (SiO2 predominantly)

Mica-rich Schist fragment (Mica Schist) — metamorphic

Mica-rich Schist fragment

Mica Schist

Likely weathered quartz-bearing rock fragment (Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite) — mineral

Likely weathered quartz-bearing rock fragment

Indeterminate; appears to contain quartz (SiO₂) with iron-oxide staining, possibly from quartzite, granite, or pegmatite