Man Made Material, Not A Natural Rock Or Mineral Specimen

Citrine (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8); variety of Orthoclase Feldspar

Amethyst (Chevron or Banded Amethyst)

Silicon Dioxide (SiO2 with iron impurities)

Amazonite

Microcline (KAlSi3O8) with trace lead (Pb) impurities

Diamond

Native Carbon (C)

Petrified Wood

Silicified Wood (primarily SiO2)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Ferruginous Quartz (Hematoid Quartz)

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Bismuth Crystal

Bismuth (Bi)

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Limonite (Iron Stone/Goethite)

Limonite (mixture of hydrated iron oxides, primarily Goethite: α-FeO(OH))

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Gneiss (Banded Gneiss)

Gneiss

Vesicular Basalt with Secondary Mineral Infill

Mafic Volcanic Rock (Basalt)

Diamond

Cubic Carbon (C)

Granite Pebble

Granite (Phaneritic intrusive igneous rock consisting of Quartz, Alkali Feldspar, and Plagioclase)

Sandstone (Wonderstone)

Arenite (composed primarily of SiO2 with Fe2O3 impurities)

Shale

Fissile Mudstone (Shale)

Agate Geode Slice (with Druzy Quartz)

Silicon Dioxide (SiO2)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Green Fluorite (likely synthetic or heat-treated for jewelry)

Calcium Fluoride (CaF2)

Milky Quartz

Silicon Dioxide (SiO2)

Dyed Pink Agate Slice

Cryptocrystalline variety of Quartz (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily SiO2)

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Gold Nugget

Native Gold (Au)

Fossilized Bone Fragment

Permineralized Vertebrate Fossil (Hydroxyapatite replaced by Minerals)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Sandstone (Greywacke/Siltstone variant)

Clastic Sedimentary Rock (composed primarily of Quartz SiO2 and Feldspar)

Sandstone

Arenite (primarily SiO2)

Sandstone (Quartzite-rich)

Clastic Sedimentary Rock (primarily SiO2)

Chert (Yellow Jasper variant)

Microcrystalline Quartz (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Sandstone (Picture Sandstone)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 primarily)

Amethyst Quartz (Tumbled)

Amethyst (Silicon Dioxide with iron impurities, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8)

Amethyst (Tumbled)

Amethyst (Silicon Dioxide, SiO2 + Fe4+)

Diamond (Green tinted)

Carbon (C) with trace impurities or lattice defects