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

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Turquoise in Matrix

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

Turquoise

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

Pyrite

Iron Sulfide (FeS2)

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Chert (Flint variety)

Chert (Microcrystalline or Cryptocrystalline Quartz), SiO2

Smoky Quartz

Silicon Dioxide (SiO2)

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Agate

Agate (Cryptocrystalline Variety of Quartz, SiO2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Turquoise

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

Garnet-Bearing Schist

Almandine Garnet Micaceous Schist

Pyrite

Iron Sulfide (FeS2)

Blue Sapphire

Corundum (Al2O3)

Carnelian Agate

Silicon Dioxide (SiO2) with Iron Oxide impurities

Diamond

Carbon (C)

Chert (containing Flint and Chalcedony)

Microcrystalline Quartz (SiO2)

Amethyst

Silicon Dioxide (SiO2) with trace Iron impurities

Pyrite

Iron Sulfide (FeS2)

Pyrite (on Quartz/Host Rock)

Iron Sulfide (FeS₂)

Rose Quartz (tumbled)

Rose Quartz (variety of Quartz, chemical formula SiO₂)

Gold Nugget

Native Gold (Au)

Pyrite

Iron Disulfide (FeS2)

Lapis Lazuli

Lapis Lazuli (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Obsidian

Volcanic Glass (SiO2)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Apatite

Apatite Group (e.g., Fluorapatite Ca5(PO4)3F, Chlorapatite Ca5(PO4)3Cl, Hydroxylapatite Ca5(PO4)3(OH))

Black Tourmaline

Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)

Druzy Quartz Geode (Oco or Moroccan variety)

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Garnet Schist

Almandine-Garnet Mica Schist

Quartz

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2)

Citrine

Citrine (Silicon Dioxide, SiO2)

Hag Stone

Perforated Sedimentary Rock (typically Limestone or Sandstone)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)