Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
Category
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
Flint
Silicon dioxide (Microcrystalline Quartz / Chert)
Quartz (likely Chalcedony or Chert)
Silicon Dioxide (SiO2)
Jasper Marble
Silicon Dioxide (SiO2) with Impurities
Quartzite
Metamorphic Quartz Arenite
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
Tumbled chalcedony (likely moss or dendritic agate)
Microcrystalline quartz, SiO₂, with iron-oxide inclusions
Quartzite
Silica (SiO2) quartzite
Flint / Chert Pebble
Microcrystalline Quartz (SiO2)
Chert
Microcrystalline silica (SiO2)
Chert (Flint)
Chert (Silicon Dioxide, SiO2)
Chert (and Agate/Chalcedony)
Microcrystalline Quartz (SiO2)
Chert (Jasper variation)
Microcrystalline Quartz (SiO2)
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Obsidian
Obsidian (Volcanic Glass)
Green Quartzite
Metamorphic Quartzite (often colored by chromium-bearing minerals or fuchsite)
Quartzite
Metamorphic Quartzite (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Smoky Quartz
Smoky Quartz (SiO2)
Chert (Flint nodule)
Chert (SiO2)
Chert (Polished River Pebble)
Chert (SiO2)
Chalcedony (Agate / Jasper Specimen)
Silicon Dioxide (SiO2)
Chert (Flint / Jasper)
Silicon Dioxide (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert / Flint
Silicon Dioxide (SiO₂)
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
Aragonite
Aragonite (Calcium Carbonate - CaCO3)
Chert (often called Flint or River Stone)
Microcrystalline alpha-quartz (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Goldstone and Aura Quartz
Cuprous Glass (Goldstone) and Titanium-coated SiO2 (Aura Quartz)
Chert (Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
Chert (Jasper/Flint)
Silicon Dioxide (SiO2)
Chert (Flint)
Microcrystalline Silica (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Chert (Chert / Flint)
Microcrystalline Quartz (SiO2)
Green Glass Cullet / Recycled Glass
Amorphous Silicon Dioxide (SiO2) with various metal oxides
Natural or Cultured Pearl
Calcium Carbonate (Aragonite and Conchiolin), CaCO3
Iron-stained quartz-rich rock, possibly jasper or chert
Microcrystalline quartz (SiO₂) with iron oxides/hydroxides
Chert / Flint
Silicon Dioxide (Microcrystalline Quartz, SiO2)