Shale
Argillaceous Rock
sedimentary
Category
Mineral Like (Natural Glass)
Browse mineral like (natural glass) specimens identified by the Rock Identifier community.
Learn about Mineral Like (Natural Glass) in the encyclopedia
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Tektite
Natural impact glass
meteorite
Sandstone (Quartz-rich)
Sandstone (SiO2 dominated)
sedimentary
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Fluorite (specifically Blue John or Banded Fluorite)
Calcium Fluoride (CaF2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Agate Slices and Clear Quartz Points
Agate (SiO2 Chalcedony) and Clear Quartz (SiO2 Crystalline)
mineral
Smoky Quartz
Smoky Quartz (SiO2)
mineral
Blue Goldstone
Goldstone (artificial glass)
Mineral (man-made glass, not natural)
Yellow Quartz (Citrine Quartz / Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Jasper and Quartz Pebble
Silicon Dioxide (SiO2) microcrystalline quartz variety
sedimentary
Amethyst and Green Aventurine (Tumbled Gemstones set in a wand)
Quartz (SiO2) varieties - Amethyst and Aventurine
gemstone
Chalcedony (Agate / Jasper Pebble)
Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Glass, SiO2 base with metallic inclusions
mineraloid (synthetic)
Opalite
Synthetic Glass (Hydrated Silica Simulant)
mineral
Raw smoky quartz with dark mineral inclusions
Quartz (SiO₂), likely smoky quartz; dark inclusions may be chlorite, tourmaline, or iron/manganese oxides
mineral
Sandstone
Arenite (compositionally various, primarily SiO2)
sedimentary
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)
mineral
Agate Nodule / Weathered Chert
SiO2 (Silicon Dioxide - Microcrystalline Quartz)
Sedimentary / Mineral
Sandstone (likely Quartzose Sandstone)
Arenite
sedimentary
Blue Topaz
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Sandstone
Arenite
sedimentary
Tektite (specifically Indochinite)
Tektite (Natural silica glass)
Mineraloid (Impact glass)
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Yellow Quartz (Chalcedony/Citrine Pebble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Hematite/Limonite cement)
sedimentary
River Quartz (Milky and Smoky mix)
Silicon Dioxide (SiO2)
mineral
Amethyst quartz cluster
Quartz, silicon dioxide (SiO₂), purple variety amethyst
mineral
Sandstone
Arenite (SiO2 based)
sedimentary
Smoky Quartz
Quartz (Silicon Dioxide) - SiO2
mineral
Ruby (Faceted)
Corundum (Al2O3:Cr)
gemstone
Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Polished amethyst pyramid
Amethyst, purple quartz (SiO₂)
mineral
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste