Sandstone (with minor weathering/pitting)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Sandstone
Arenite (primarily composed of SiO2)
sedimentary
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)
sedimentary
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Massive Quartz
Silicon dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide, SiO2) with inclusions
mineral
Silicon
Silicon (Si)
mineral
Slag (Industrial Byproduct)
Anthropogenic Vitreous Silicate material
igneous
Basalt
Basalt (Extrusive volcanic rock)
igneous
Snowflake Obsidian
Spherulitic Obsidian (contains Cristobalite inclusions)
igneous
Obsidian
Volcanic glass (SiO2-rich)
igneous
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite (River Stone)
Quartzite
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Chert with Limestone matrix
Microcrystalline silica (SiO2) in Calcite (CaCO3) matrix
sedimentary
Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
metamorphic
Snowflake Obsidian
Vitreous volcanic rock with Cristobalite inclusions (mostly SiO2)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace impurities of titanium, iron, or manganese
mineral
Quartz (Citrine or Iron-Stained)
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Pumice
Pumice (Volcanic silicate glass)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Pumice (Volcanic Rock)
Vesicular volcanic rock (composed largely of amorphous volcanic glass)
igneous
Sheen Obsidian
Volcanic glass (SiO2 with inclusions)
igneous
Pumice
Pumice (Vesicular Rhyolite/Andesite)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Pumice
Pumice (Amorphous volcanic glass)
igneous
Chert (Flint Nodules)
Microcrystalline quartz (SiO2)
sedimentary
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Blue Slag Glass
Ferro-silicate glass (Slag)
igneous (man-made/industrial)
Diamond (or Simulant)
Carbon (C)
gemstone
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Tektite (Indochinite)
Tektite - High-silica amorphous glass (SiO2 + Al2O3)
mineraloid
Sandstone (Ferruginous)
Arenite with Iron Oxide cement (SiO2 + Fe2O3)
sedimentary