Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
Category
Browse sedimentary (man made composite) specimens identified by the Rock Identifier community.
Sandstone (Red/Brown Variety)
Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
Chert (Jasper/Agate variety)
Silicon Dioxide (SiO2)
Chert
Microcrystalline Quartz (SiO2)
Chert (often called Flint)
Microcrystalline Quartz (SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Chert / Green Jasper
Silicon Dioxide (SiO2)
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
Pyrite
Iron Sulfide (FeS2)
Tourmalinated Quartz
Quartz (SiO2) with included Tourmaline (complex borosilicate)
Luminous Stone (Glow-in-the-dark Synthetic/Man-made Stone)
Strontium Aluminate tinted glass or resin (Crystalline silicate/oxide mix)
Diamond Druzy (Crystalline Diamond)
Carbon (C)
Corundum (Sapphire/Ruby in Matrix)
Corundum (Al2O3)
Black Obsidian
Obsidian (Volcanic Glass, SiO2 + impurities)
Diamond
Diamond (pure native carbon, C)
Pink calcite (likely)
Calcite — calcium carbonate, CaCO₃
Clear Quartz
Silicon Dioxide (SiO2)
Basalt
Basalt
Petrified Wood
Silicified Wood (primarily SiO2)
Chert (Jasper variety)
Silicon Dioxide (SiO2)
Chert / River Pebble
Microcrystalline Quartz (SiO2)
Flint/Chert Nodule in Limestone
Sedimentary rock containing microcrystalline quartz (SiO2) within a calcium carbonate (CaCO3) matrix
Chert (specifically Red Chert or Jasper)
Microcrystalline Quartz (SiO2)
Chert (specifically Flint or Common Chert node)
Silicon Dioxide (SiO2)
Chert (variations include Flint/Novaculite)
Chert (formula: SiO2)
Chert (often called Flint for darker varieties)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
Chert / Yellow Jasper
Microcrystalline Quartz (SiO2)
Chert with Limestone
Silicon Dioxide (SiO2) in Calcium Carbonate (CaCO3) Matrix
Chert (Tan/Brown variety)
Chert (Silicon Dioxide, SiO2)
Coquina
Biogenic Limestone (Calcite/Aragonite base, CaCO3)
Chert (specifically Jasper or Flint variety)
Cryptocrystalline Quartz (SiO2)
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
Chert (and Flint)
Silicon Dioxide (SiO2)
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
Synthetic Faux Fur Fursuit
Polyacrylonitrile / Polyester (Synthetic Textile)
Tumbled amber-colored chalcedony or jasper
Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper
Basalt
Basalt
Gold
Native Gold (Au)
Chert (and Flint)
Silicon Dioxide (SiO2)
Chert (specifically White Chert or Novaculite)
Silicon Dioxide (SiO₂)
Chert (Grey-Green Flint)
Microcrystalline silicon dioxide (SiO2)