Pumice
Pumice (extrusive volcanic glass)
igneous
Category
Igneous Rock (Volcanic Glass)
Browse igneous rock (volcanic glass) specimens identified by the Rock Identifier community.
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Pumice
Pumice (Amorphous volcanic glass)
igneous
Vesicular volcanic rock (likely scoria)
Scoria, typically basaltic to andesitic volcanic rock
igneous
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Obsidian
Volcanic glass (mainly SiO2)
Igneous
Pumice
Pumice (a vesicular volcanic glass)
igneous
Polished porphyritic volcanic rock (likely rhyolite or andesite)
Porphyritic rhyolite–andesite; fine volcanic groundmass with abundant pale feldspar phenocrysts and possible vesicles
igneous
Quartz Vein in Matrix
Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix
igneous
Tumbled blue-gray stone, likely basalt or slate
Probable fine-grained basalt; exact identification is uncertain from the photograph
igneous
Agate (Carnelian / Chalcedony)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Snowflake Obsidian
Volcanic glass (SiO2) with Cristobalite (SiO2) inclusions
igneous
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Porphyritic Rhyolite (Red)
Rhyolite (Porphyry)
igneous
Pumice
Pumice (felsic volcanic rock)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Pumice
Pumicite (Amorphous Volcanic Glass)
igneous
Pumice
Volcanic pumice; chiefly vesicular volcanic glass composed of rhyolitic to dacitic silicates
igneous
Pumice (with oxidation)
Pumice (Vitreous pyroclastic rock)
igneous
Obsidian with Slate/Tuff
Volcanic glass (SiO2) with associated pyroclastic rock
igneous
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Pumice
Pumice (Volcanic silicate glass)
igneous
Quartz Crystal (Amethyst)
Silicon Dioxide (SiO2)
mineral
Vesicular volcanic rock, likely pumice or scoriaceous rhyolite
Silica-rich vesicular volcanic rock; commonly rhyolitic pumice (SiO₂-rich glass)
igneous
Obsidian (likely snowflake or volcanic-glass variety)
Volcanic glass, predominantly rhyolitic in composition; mainly SiO₂ with minor Al, Na, K, Fe, and Ca
igneous
Porous volcanic rock (likely scoria)
Scoria, vesicular basaltic to andesitic volcanic rock
igneous
Pumice
Pumice, a highly vesicular volcanic glass composed mainly of rhyolitic to dacitic silicate material
igneous
Pumice
Pumice (felsic volcanic rock)
igneous
Scoria
Scoria (Extrusive Volcanic Rock)
igneous
Pumice
Pumice (a highly vesicular volcanic glass)
igneous
Basalt
Extrusive Igneous Rock
igneous
Scoria (vesicular basalt)
Scoria; vesicular mafic volcanic rock, typically basaltic in composition
igneous
Quartz on Basalt
Silicon Dioxide (SiO2) on Mafic Igneous Rock
Mineral on Igneous Rock
Pumice
Pumice (Vesicular Felsic Volcanic Rock)
igneous
Pumice
Pumice (Alveolar Rhyolite / Dacite / Andesite)
igneous
Quartz in Host Rock
Silicon Dioxide (SiO2) in Rhyolite or Granite matrix
igneous
Wonderstone (Banded Rhyolite)
Rhyolite (Silicon Dioxide with Iron Oxide impurities)
igneous
Pumice
Pumice (Silicic volcanic glass)
igneous
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Pumice
Pumice (Volcanic glass / Felsic igneous rock)
igneous
Pumice
Pumice (a volcanic glass, primarily SiO2 with Al2O3)
igneous