Clear Quartz
Silicon Dioxide (SiO2) / Rock Crystal
mineral
Category
Glass
Browse glass specimens identified by the Rock Identifier community.
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Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silica - SiO2)
mineral
Green Aventurine in Host Rock
SiO2 (Quartz with Fuchsite inclusions)
mineral
Rough Quartz (Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Sapphire
Corundum (Al2O3)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Slag Glass
Vitreous Silicate Residue
industrial byproduct (anthropogenic rock)
Sea Glass
Amorphous Silica (Anthropogenic glass) - SiO2
mineral
Slag Glass
Glassy Silicate Residue
industrial byproduct
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Iron Slag
Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)
Anthropogenic (Man-made industrial byproduct)
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Jasper
Jasper (Cryptocrystalline variety of Quartz, SiO2)
sedimentary
Chert (specifically Gray/Black Chert)
Chert (Microcrystalline or Cryptocrystalline Quartz, SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Obsidian
Volcanic glass (SiO2 + impurities)
igneous
Obsidian
Extrusive igneous volcanic glass
igneous
Tumbled Agate and Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Chert (Flint variety)
Silicon Dioxide (SiO2)
sedimentary
Rose Quartz
Silicon Dioxide (SiO2) with traces of titanium, iron, or manganese
mineral
Yellow Quartz / Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace Titanium, Manganese, or Iron
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Gray Quartz (Tumbled)
Silicon Dioxide (SiO2)
mineral
Slag (Anthropogenic Glass/Iron byproduct)
Ferro-silicate Slag
Anthropogenic (Man-made)
Rose Quartz
Silicon Dioxide with trace inclusions (SiO2)
mineral
Quartz (Gray or Smoky variety)
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO₂)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Basalt
Basalt (Aphanitic Igneous Rock)
igneous
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Chert (Flint)
Chert (Cryptocrystalline Silicon Dioxide, SiO2)
sedimentary
Quartz Pebble (Milky and Gray)
Quartz (Silicon Dioxide, SiO2)
mineral
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70-75% SiO2)
igneous
Fulgurite
Liesegang (Fulgurite)
Mineraloid
Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)
Silicon Dioxide (SiO2) with metallic inclusions
man-made material
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Chalcedony (Grey/White Agate)
Silicon Dioxide (SiO₂)
mineral