Red Jasper
Jasper (Silicate Mineral), SiO2 with Fe2O3 inclusions
sedimentary
Category
Synthetic (Man Made Glass)
Browse synthetic (man made glass) specimens identified by the Rock Identifier community.
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Chert (often called Flint when dark)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Polished black stone, likely black obsidian
Obsidian — volcanic glass, chiefly SiO₂
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Brown quartz-rich stone, possibly smoky quartz or quartzite
Quartz (SiO₂), potentially in a quartzite or silica-rich matrix
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Flesh-colored Quartzite
Quartzite (SiO2)
metamorphic
Slag (Industrial Glass/Byproduct)
Anthropogenic Vitreous Silicate
igneous (anthropogenic)
Polished carnelian-rich agate (likely polyhedral jasper/chalcedony)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
mineral
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Pumice
Pumice (Vesicular volcanic glass)
igneous
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Polished agate geode slice
Microcrystalline quartz (chalcedony), SiO₂, with iron-oxide coloration
mineral
Polished yellow jasper or opaque chalcedony bead
Microcrystalline quartz (SiO₂), likely iron-oxide-stained jasper
mineral
Obsidian
Volcanic Glass (SiO2 + impurities)
igneous
Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Libyan Desert Glass
Impactite silica glass (SiO2)
tektite (impact glass)
Tumbled quartz-rich stone, likely milky quartz
Quartz (SiO₂), possibly iron-stained milky quartz or quartzite
mineral
Quartz Crystal Cluster / Quartzite
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2-rich)
igneous
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Quartzite (River Pebble)
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Clear Quartz (Rock Crystal) Bracelet
Silicon Dioxide (SiO2)
gemstone
Weathered vuggy quartz-rich rock (probable silicified limestone or quartz breccia)
Microcrystalline quartz (SiO₂) with calcite (CaCO₃), iron oxides, and minor clay minerals
sedimentary
Dragon Vein Agate (Dyed/Fractured Quartz)
Silicon dioxide (SiO2)
gemstone
Black Onyx
Chalcedony (Silicon Dioxide, SiO2)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Tumbled brown pebble
Indeterminate; likely quartz-rich sandstone or chert
sedimentary
Sodalite
Sodalite (Sodium Aluminum Silicate Chloride), Na8(Al6Si6O24)Cl2
Mineral
River Quartz / Quartzite Pebbles
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Raw milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
River Quartzite Spheroid
Recrystallized Orthoquartzite (SiO2)
metamorphic
Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sandstone
Sedimentary Rock (Quartzose Sandstone)
sedimentary