Chert Pebble
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Category
Man Made Mineral Simulant (Glass)
Browse man made mineral simulant (glass) specimens identified by the Rock Identifier community.
Learn about Man Made Mineral Simulant (Glass) in the encyclopedia
View all →
Amethyst
Silicon Dioxide (SiO2) with Fe3+ impurities
mineral
Faceted Glass (Costume Jewelry)
Amorphous Silicon Dioxide with colorants (Glass)
Synthetic/Man-made Material
Amethyst Cluster
Silicon Dioxide with Iron impurities (SiO2)
mineral
Diamond (in Jewelry)
Diamond (Carbon, C)
mineral
Tumbled greenstone (likely serpentinite or green jasper)
Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing
metamorphic
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Aventurine
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
metamorphic
Grey Chalcedony
Silicon Dioxide (SiO2)
mineral
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Obsidian
Volcanic Glass (Amorphous Silicon Dioxide)
igneous
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Sandstone
Sandstone (Quartz-rich Arenite / SiO2)
sedimentary
Slag (Industrial Glass/Metal)
Ferrous slag or Glassy silicate byproduct
Antropogenic rock (Man-made)
Tumbled yellow jasper or chalcedony
Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony
mineral
Sandstone
Arenite
sedimentary
Ruby in Matrix
Corundum (Al2O3)
mineral
Beaded gemstone bracelet, likely lapis lazuli and pale quartz/agate
Lapis lazuli: lazurite-rich rock, chiefly (Na,Ca)₈(AlSiO₄)₆(S,SO)₂; pale beads are uncertain
gemstone
Cullet Glass (Industrial Slag Glass)
Amorphous Silica (SiO2) with metallic oxide impurities
Man-made byproduct (often mistaken for Obsidian or Emerald)
Red Slag Glass (Cullet)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Antropogenic (Man-made material)
Tumbled purple chalcedony or low-grade amethyst bead bracelet
Chalcedony (microcrystalline SiO₂), possibly quartz/amethyst; composition is SiO₂
mineral
Chert (Jasper)
Silicon Dioxide (SiO2)
sedimentary
Chert / Jasper
Silicon Dioxide (SiO₂)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Likely smoky quartz pendant
Smoky quartz, silicon dioxide (SiO₂), quartz variety colored by irradiation-related defects
gemstone
Tumbled milky quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
mineral
Chert (variations include Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite
Metamorphic Quartz Sandstone
metamorphic
White pebbles (rock material not identifiable from the image)
Undetermined; the smooth, pale pieces could be quartz, quartzite, or another light-colored rock
sedimentary
Chert or Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (likely Fossiliferous)
Arenite / Fossiliferous Sandstone (SiO2 composition)
sedimentary
Flint
SiO2 (Cryptocrystalline Quartz)
sedimentary
Slag Glass / Industrial Slag
Anthropogenic Glass
man-made glass / industrial byproduct
Chert (Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Blue faceted gemstone, likely synthetic sapphire or blue glass
Corundum (Al₂O₃) if sapphire; identity cannot be confirmed visually
gemstone
Yellow faceted gemstone, likely citrine or yellow sapphire
Uncertain; probable quartz (SiO₂) or corundum (Al₂O₃)
gemstone
Red-and-white jasper/chalcedony pebble
Microcrystalline quartz (SiO₂), likely hematite- or iron-oxide-bearing jasper with white chalcedony/quartz
mineral
Black Chert River Stone
Cryptocrystalline Quartz (SiO2)
sedimentary