Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Category
Synthetic (Glass)
Browse synthetic (glass) specimens identified by the Rock Identifier community.
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Chert / Flint
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sea Glass (Uranium/Vaseline Glass variant)
Silicon Dioxide (SiO2) with trace Uranium Oxide (U3O8)
man-made silicate (anthropogenic glass)
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert / Flint
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Green Aventurine
Aventurine Quartz (SiO2) with Fuchsite inclusions
metamorphic
Quartz (Milky or Citrine-tinted)
Silicon Dioxide (SiO2)
mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Quartz Crystal with Inclusions
Silicon Dioxide (SiO2)
mineral
Slag (Industrial Glass/Glassy Rock)
Anthropogenic Vitreous Material
igneous
Rounded quartz-rich pebble
Chert or quartzite pebble (tentative; mostly microcrystalline quartz, SiO₂)
sedimentary
Weathered quartz-rich rock, possibly chert or milky quartz
Mostly microcrystalline or crystalline quartz (SiO₂), identification uncertain from photograph
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
gemstone
Quartz Pebble (Iron-Stained)
Quartz (Silicon Dioxide - SiO2)
mineral
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Pink quartz (likely rose quartz)
Quartz, silicon dioxide (SiO₂), typically massive rose quartz colored by trace elements and microscopic inclusions
mineral
Smoky Quartz (Vein Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Pumice
Pumice (Vesicular Felsic Igneous Rock)
igneous
Amethyst (Rose-tinted variation)
Silicon Dioxide (SiO2) with trace iron impurities
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(F,OH)2
mineral
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Quartz (Crystal Fragment)
Silicon Dioxide (SiO2)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Moon Pendant
Silicon Dioxide (SiO2)
gemstone
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint variety)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Chert / Chalcedony
Silicon Dioxide (SiO2)
sedimentary
Jasper Shard / Chert
Silicon dioxide (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Silicon dioxide (SiO2) - Microcrystalline quartz
sedimentary
Flint or Chert
Microcrystalline Quartz (SiO2)
sedimentary
Amethyst (Chevron Amethyst/Dream Amethyst)
Silicon Dioxide (SiO2) with trace Iron impurities
mineral
Clear Quartz (Faceted Crystal)
Silicon Dioxide (SiO2)
mineral