Chert (Field Stone)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Category
None
Browse none specimens identified by the Rock Identifier community.
Gold
Native Gold (Au)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Jasper (specifically Yellow Jasper and Red Jasper)
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Basalt River Cobble
Basalt (Mafic Igneous Rock)
igneous
Chrysoprase
Nickel-bearing Chalcedony (SiO2 with Ni impurities)
mineral
Sandstone (likely Arkosic or Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Red Tiger's Eye
Silicified Crocidolite (Quartz pseudo-morph after Crocidolite), SiO2
metamorphic
Cubic Zirconia (CZ) Jewelry
Zirconium dioxide (ZrO2)
mineral (synthetic)
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Amethyst (Tumbled)
Silicon Dioxide (SiO2 with iron impurities)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chert Breccia
Brecciated Chert (Microcrystalline Silica)
sedimentary
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
not a rock or mineral (anthropogenic material)
Ferruginous Sandstone
Arenite with Iron-Oxide Cement (SiO2 with Fe2O3/FeO(OH))
sedimentary
Chert (Nodule)
Microcrystalline quartz (SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Herkimer Diamond
Double-terminated Quartz (Silicon Dioxide, SiO2)
mineral
Silver (S925)
Native Silver (Ag)
mineral
Ammonite Fossil
Ammonoidea (primarily composed of Calcite, CaCO3)
sedimentary
Quartzite Pebble
Quartzite (mostly SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Yellow Quartz (Citrine or Quartzite Pebble)
Silicon Dioxide (SiO2)
mineral
Quartz (River Cobble)
Silicon Dioxide (SiO2)
mineral
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Native Silver
Silver (Ag)
mineral
Puddingstone (Jasper Conglomerate)
Jasper Conglomerate (SiO2 matrix with Fe2O3 inclusions)
sedimentary
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Tumbled Stones (various)
Mixed Silica-based Minerals (primarily Quartz and Chalcedony)
mineral
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Milky or Common Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral