Metamorphic Or Igneous

Garnet (likely Almandine or a blend)

Garnet group: X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+. Given the dark, somewhat reddish-brown appearance in the image, it's likely Almandine (Fe3Al2(SiO4)3) or a mix with other iron-rich garnets.

Lapis Lazuli

Lazurite-rich metamorphic rock (approx. Na6Ca2(Al6Si6O24)(S,SO4,Cl)1,2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz / Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Moonstone

Orthoclase Feldspar (formula: (K,Na)AlSi3O8)

Yellow Quartz (Citrine or Iron-Stained Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky or White Quartz)

Silicon Dioxide (SiO2)

Ruby

Corundum (Al2O3 with Chromium traces)

Orange Calcite

Calcium Carbonate (CaCO3)

Yellow Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Black Tourmaline

Schorl (Sodium iron aluminum borosilicate), NaFe3Al6(BO3)3Si6O18(OH)4

Moonstone

Adularia / Orthoclase (KAlSi3O8)

Moonstone (Green Moonstone / Garnierite)

Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (mica)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky or Common Quartz)

Silicon Dioxide (SiO2)

Amethyst (Purple), Sulfur (Yellow), and Blue Apatite

SiO2 (Quartz), S (Native Sulfur), Ca5(PO4)3(F,Cl,OH) (Apatite Group)

Orthoclase Feldspar

KAlSi3O8 (Potassium aluminum silicate)

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Quartz River Cobble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Yellow Quartz (Citrine or Quartzite Pebble)

Silicon Dioxide (SiO2)

Red Garnet

Pyrope or Almandine (Silicate group, X3Y2(SiO4)3)

Pyrite

Iron Sulfide (FeS2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Red Garnet

Almandine Garnet (Fe3Al2(SiO4)3)

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Smoky Quartz

Quartz (Silicon Dioxide) - SiO2

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Orthoclase Feldspar

Potassium Feldspar (KAlSi3O8)

Arfvedsonite in Quartz (also labeled as Astrophyllite or Nuummite by collectors)

[Na][Na2][Mg4Fe2+](Si8O22)(OH)2 in SiO2

Citrine

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Lemon Quartz (Orizaba/Citrinated Quartz)

Silicon Dioxide (SiO2) with iron impurities/treatment

Milky Quartz

Silicon Dioxide (SiO2)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)