Chert (with nodule)
Microcrystalline Quartz (SiO2)
Category
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
Chert (with nodule)
Microcrystalline Quartz (SiO2)
Sandstone
Arenite
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
Sandstone
Clastic Sedimentary Rock
Chert (Flint)
Silicon Dioxide (SiO2)
Quartzite
Quartzite (Metamorphic Quartz Sandstone)
Tektite
Natural impact glass
Sandstone
Arenite
Red Quartzite
Quartzite (Metamorphic quartz sandstone)
Tektite (Indochinite)
Tektite (Amorphous Silica Glass)
Sandstone
Arenite (SiO2 primarily)
Beach Pebble (Chalcedony / Chert)
Silicon Dioxide (SiO2)
Sandstone
Sedimentary Rock (Quartz arenite)
Pearls (likely freshwater cultured pearls)
Pearl: nacre, primarily aragonite (CaCO₃) with conchiolin
Diamond
Carbon (C)
Goldstone
Not a natural mineral or rock. It is an ornamental glass.
Sandstone (likely Quartzose)
Clastic sedimentary rock (SiO2 primary)
Chert (Black Chert or Flint)
Silicon Dioxide (SiO2)
Sandstone
Arenite (primarily SiO2)
Sandstone (likely Quartzose Sandstone)
Arenite
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Quartzite
Metamorphic Quartzite (SiO2)
Sandstone (specifically Arkose or Quartz Arenite)
Arenite (primarily SiO2 with possible Feldspar)
Chert / Flint
Microcrystalline Quartz (SiO2)
Chert (often called Flint)
Chert (SiO2)
Chert (Flint)
Cryptocrystalline Quartz (SiO2)
Flint / Chert
Microcrystalline quartz (SiO2)
Chert (Quartz Variety)
Chert (Silicon Dioxide, SiO2)
Smoky Quartz
Silicon Dioxide (SiO2)
Chert (Flint)
Chert (SiO2)
Chert
Microcrystalline quartz (SiO2)
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
Chert (Black Flint)
Silicon Dioxide (SiO2)
Chert (Chocolate or Brown Flint)
Chert (SiO2)
Chert (Flint)
Silicon Dioxide (SiO2)
Granite
Phaneritic Felsic Igneous Rock
Sandstone
Arenite (variable SiO2 composition)
Sandstone (Quartzose)
Arenite (primarily SiO2)
Granite
Felsic intrusive igneous rock
Brown Chert
Microcrystalline Quartz (SiO2)