Fossiliferous Limestone
Fossiliferous Calcilutite / Biomicrite
sedimentary
Category
Synthetic Or Natural Fiber
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Blue Lace Agate
Cryptocrystalline Quartz (SiO2) with trace minerals
sedimentary
Dragon Vein Agate
Silicon Dioxide (SiO2)
mineral
Sandstone (Quartzose)
Arenite (SiO2 principal composition)
sedimentary
Dyed Pumice
Vesicular Rhyolite (Artificial Coloration Addition)
igneous
Diamond (in a jewelry setting)
Carbon (C)
mineral
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Green Agate
Silicon Dioxide (SiO2) - Variety of Chalcedony
mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Shale
Fissile Mudstone (primarily composed of clay minerals and quartz)
sedimentary
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Pumice
Vesicular Rhyolite or Trachyte (High-silica volcanic glass)
igneous
Sandstone (with Iron Oxidation)
Arenite (SiO2 with Fe-oxides)
sedimentary
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Fossiliferous Limestone
Calcareous biomicrite / Bioclastic limestone
sedimentary
Sandstone
Arenite
sedimentary
Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Howlite
Howlite (Ca2B5SiO9(OH)5)
mineral
Rough Sapphire
Corundum (Al2O3)
mineral
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Shale
Shale (clay-rich mudstone)
sedimentary
Shale
Lutaceous Sedimentary Rock
sedimentary
Dyed Blue Agate Slice
Silicon Dioxide (SiO2)
mineral
Onyx (Black Onyx)
Silicon Dioxide (SiO2) - Chalcedony variety
Mineral
Sandstone (Ferruginous)
Sandstone (Clastic sedimentary rock, predominantly SiO2 with Fe2O3 cement)
sedimentary
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Pumice
Pumice (a vesicular volcanic glass)
igneous
N/A - Image is non-geological
Acrylonitrile Butadiene Styrene (ABS) or Polypropylene (PP)
Synthetic material (Plastic/Polymer)
Citrine
Silicon Dioxide (SiO2)
mineral
Pyrite (on the right) and Magnetite or Hematite (on the left)
Iron Sulfide (FeS2) and Iron Oxide (Fe3O4 or Fe2O3)
mineral
Libyan Desert Glass
Libyan Desert Glass (Impactite / High-silica Lechatelierite)
mineral
Green Quartz (Prasiolite variant or Aventurine)
Silicon Dioxide (SiO2)
mineral
River Stone (likely Siltstone or fine-grained Sandstone)
Clastic Sedimentary Rock (Lithic Wacke / Siltstone)
sedimentary
Iron-stained Quartzite
Metamorphic Quartz (SiO2) with limonite/hematite staining
metamorphic
Granite (Weathered River Rock)
Granite (Phaneritic Igneous Rock)
igneous
Quartz (Smoky Quartz variant)
Silicon Dioxide (SiO2)
mineral
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Sandstone
Arenite
sedimentary
Granite Pebble
Granite
igneous
Magnetite or Magnetic Iron Ore
Magnetite (Fe3O4)
mineral
Magnetite / Iron Ore
Magnetite (Fe3O4)
mineral