Mineral (Gemstone Variety Of Beryl)

Hematite

Iron(III) oxide (Fe2O3)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Blue Kyanite

Kyanite (Al2SiO5)

Chrysocolla

Hydrated copper silicates (Cu, Al)2H2Si2O5(OH)4·nH2O

Almandine Garnet in Matrix

Almandine Garnet (Fe3Al2(SiO4)3) in Schist/Quartz Matrix

Citrine

Silicon Dioxide (SiO2)

Citrine

Silicon Dioxide (SiO₂)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2)

K2 Jasper (K2 Granite)

Azurite in Granite (Al2Cu3(CO3)2(OH)2 in NaAlSi3O8)

Amethyst

Amethyst (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) containing Iron impurities

Amazonite with Smoky Quartz and Feldspar

Microcline (KAlSi3O8) with Quartz (SiO2)

Tiger's Eye

Silicon Dioxide (SiO2) with Limonite/Goethite pseudomorphs after Crocidolite

Blue Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions of asbestiform silicates)

Sunstone

Aventurine Feldspar (Plagioclase Feldspar with inclusions)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Amethyst with Marcasite accents

Amethyst (Silicon Dioxide SiO2) and Marcasite (Iron Sulfide FeS2)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide) with Iron (Fe3+) impurities

Rough Citrine Quartz

Citrine (Silicon Dioxide, SiO2 with iron impurities)

Yellow Jasper

Silicon Dioxide (SiO2) with hydrated iron oxide impurities (Goethite)

Selenite

Gypsum (CaSO4·2H2O), specifically the crystalline variety Selenite

Lapis Lazuli

Sodium aluminum silicate with sulfur (main component: Lazurite [(Na,Ca)8(AlSiO4)6(SO4,S,Cl)2])

Black Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Black Onyx

Silicon Dioxide (SiO2)

Banded Agate

Sedimentary Cryptocrystalline Quartz (SiO2)

Garnet (likely Almandine)

Almandine Garnet, Fe3Al2(SiO4)3

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Serpentinite

Serpentinite (group of hydrous magnesium iron phyllosilicates)

Banded Agate (Crazy Lace/Mexican Agate Variety)

Silicon Dioxide (SiO2)

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Jade

Jade can refer to two distinct minerals: Nephrite (a variety of the mineral actinolite, Ca2(Mg,Fe)5Si8O22(OH)2) and Jadeite (Na(Al,Fe3+)Si2O6). Based on the image, showing a relatively uniform green color and possibly slight translucence in bead form, it is very likely one of these, but determining which one from a photo is difficult without specific testing.

Quartz Geode

Silicon dioxide (SiO2)

Hypersthene

(Mg,Fe)SiO3 - Enstatite-Ferrosilite series

Obsidian

Obsidian (principally SiO2 - Silicon Dioxide)

River Stone (River Pebbles)

Alluvial Deposit (typically Quartzite, Sandstone, or Granite clasts)

Pearl

Organic gemstone (Calcium carbonate / CaCO3 + Conchiolin)

Dalmation Stone (often called Dalmatian Jasper)

Antiperthite-rich Microgranite

Moonstone

Orthoclase (Potassium aluminum silicate - KAlSi3O8)

Quartz (in matrix)

Quartz (SiO₂)