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

Quartz (Smoky/Milky variety with inclusion)

Silicon Dioxide (SiO2)

Turquoise (likely Sleeping Beauty variety or treated Howlite imitation)

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

Clear Quartz

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (KAl2(AlSi3O10)(OH)2 / K(Mg,Fe)3AlSi3O10(OH)2)

Granite

Phaneritic Intrusive Igneous Rock (composed of Quartz, Feldspar, and Mica)

Concretion

Septarian concretion (likely containing Calcite or Siderite)

Quartz Geode

Silicon Dioxide (SiO2) within a geode

Pyrite

Iron Disulfide (FeS2)

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Granite Pebble

Granite (a plutonic igneous rock composed primarily of quartz, feldspar, and mica/amphibole)

Smoky Quartz

Silicon Dioxide (SiO2)

Mica Schist

Muscovite/Biotite Schist

Sunstone (variety of Feldspar)

Oligoclase Sunstone, Plagioclase Feldspar (Na,Ca)Al(Si,Al)Si2O8

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Desert Varnish (on Sandstone)

Rock Varnish (composed of Manganese oxides, Iron oxides, and Clay minerals)

Pink Dyed Agate

Silicon Dioxide (SiO2) - Variety Agate

Pyrite

Iron Pyrite (FeS2)

Shale

Shale (clastic sedimentary rock)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Smoky Quartz

Silicon Dioxide (SiO2)

Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace amounts of Chromium/Vanadium

Porphyritic Basalt (with Quartz or Calcite inclusion)

Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)

Green Fluorite

Calcium Fluoride (CaF2)

Chrysoprase

Chalcedony (cryptocrystalline quartz) with nickel inclusions; SiO2

Turquoise in Matrix

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

Ferruginous Chert

Microcrystalline Quartz (SiO2) with Iron Oxides

Quartzite

Quartzite

Yellow Quartz or Citrine

Silicon Dioxide (SiO2)

Conglomerate

Clastic sedimentary rock (Puddingstone)

Pyrite

Iron Sulfide (FeS2)

Amethyst Geodes

Silicon Dioxide (Quartz with Iron impurities), SiO2

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Meteorite (Chondrite)

Stony Meteorite (Ordinary Chondrite)

Fluorite

Calcium Fluoride (CaF2)

Jasper

Silicon Dioxide (SiO2)

Amethyst (Faceted)

Quartz (SiO2) with iron impurities

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (Formula: (K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Ferruginous Quartz

Silicon Dioxide with Hematite/Limonite impurities (SiO2 + Fe2O3)

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.