This Appears To Be A Man Made Metallic Object, Likely Jewelry, Not A Natural Rock, Mineral, Or Geological Specimen.

Veined Limestone (Micrite) with Quartz/Calcite Veins

Calcium Carbonate (CaCO3) with Silicate or Carbonate inclusions

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Labradorite (Feldspar)

Labradorite, (Ca,Na)(Al,Si)4O8

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Multi-gemstone Quartz and Fluorite Bracelet

Silicon Dioxide (SiO2) and Calcium Fluoride (CaF2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite

Pyrite (FeS2)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

Pyrite

Iron Sulfide (FeS2)

Turquoise

Turquoise (CuAl6(PO4)4(OH)8·4H2O)

Shungite

Shungite (carbon-rich Precambrian rock)

Petrified Wood

Silicified wood (Quartz/Chalcedony)

Milky and Citrine-type Quartz

Silicon Dioxide (SiO2)

Rhodonite

Rhodonite; (Mn,Fe,Mg,Ca)SiO3

Gold

Native Gold (Au)

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Petrified Wood

Silicon Dioxide (SiO2) permineralized organic matter

Green Quartz (Prasiolite/Adventurine/Jasper)

Silicon Dioxide (SiO2)

Blue Sapphire (Tumbled/Polished)

Corundum (Al2O3)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Scoria (Lava Rock)

Scoria (Vesicular Basaltic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminium phosphate)

Turquoise

Hydrated phosphate of copper and aluminium [CuAl6(PO4)4(OH)8·4H2O]

Banded Agate (Onyx variety)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Citrine Geode Fragment

Citrine (Silicon Dioxide with Iron Impurities), SiO2

Amethyst Lace Agate / Banded Amethyst

Silicon Dioxide (SiO2) with Fe3+ impurities

Gold Nugget

Native Gold (Au)

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with Elemental Gold (Au)

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Granite

Phaneritic high-silica plutonic rock (composed primarily of Quartz, Feldspar, and Mica)

Hag Stone

Calcareous sedimentary rock (often Chert, Flint, or Limestone)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Dyed Agate Slice

Silicon Dioxide (SiO2) - variety of Chalcedony

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

Amethyst and Gravel Collection

Amethyst (Silicon Dioxide, SiO2)

Sandstone

Sandstone (Clastic Sedimentary Rock)

Pyrite

Iron Sulfide (FeS2)

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)