Basalt
Basalt (primarily Pyroxene and Plagioclase)
igneous
Category
Igneous Rock (Volcanic Glass)
Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.
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Mahogany Obsidian
Volcanic glass (SiO2 with Hematite or Magnetite inclusions)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Porphyritic Basalt
Porphyritic Basalt (Silicate Rock)
igneous
Jasper
Chalcedony (SiO2)
Sedimentary/Mineral
Beach Agate / Jasper Pebble
Cryptocrystalline Quartz (SiO2)
sedimentary
Mahogany Obsidian
Volcanic Glass with Hematite inclusions
igneous
Black Obsidian cabochon
Volcanic Glass (SiO2 + impurities)
igneous
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Amethyst Quartz
Silicon Dioxide (SiO2) with iron impurities
mineral
Scoria
Vesicular Basalt / Scoria (Mafic silicate rock)
Igneous
Basalt
Basalt (composition of Plagioclase feldspar, Pyroxene, and Olivine)
igneous
Pumice
Pumice (Felsic volcanic glass)
igneous
Obsidian
Volcanic Glass (Rich in SiO2)
igneous
Gold Sheen Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Obsidian
Volcanic Glass (Amorphous SiO2)
igneous
Tumbled Obsidian
Volcanic Glass (Silicon Dioxide)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian (in jewelry setting)
Volcanic Glass (Amorphous Silica)
igneous
Rainbow Obsidian
Volcanic Glass (SiO2 + impurities)
Igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Obsidian
Obsidian (Extrusive Volcanic Glass)
igneous
Obsidian
Volcanic glass (Mainly SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Black Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Obsidian
Volcanic Glass (SiO2 rich)
Igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Mahogany Obsidian
Volcanic Glass (SiO2 + Fe2O3)
igneous
Obsidian
Volcanic Glass (predominantly SiO2)
igneous
Apache Tear
Hydrated Obsidians (Volcanic Glass)
igneous
Obsidian
Volcanic Glass (Amorphous Silica)
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Obsidian
Volcanic Glass (SiO2 dominant)
igneous
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Granodiorite
Phaneritic Plutonic Rock (Intermediate)
igneous
Diorite
Intermediate Phaneritic Igneous Rock (Diorite)
igneous