Crystal

Brimstone (Native Sulfur)

Native Sulfur (S)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Smoky Quartz

Silicon Dioxide (SiO2)

Pyrite

Iron Sulfide (FeS2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Amethyst and Citrine (Ametrine Mix)

Silicon Dioxide (SiO2) with Fe3+ impurities

Azurite in Gossan

Azurite (Cu3(CO3)2(OH)2) in Limonite/Goethite matrix

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Chalcedony (Botryoidal)

Silicon Dioxide (SiO2)

Quartz (Translucent/Rose variety)

Silicon Dioxide (SiO2)

Epidote (likely Unakite component or Epidosite)

Epidote (Ca2(Al2Fe)(SiO4)(Si2O7)O(OH))

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Rhodochrosite

Manganese carbonate (MnCO3)

Aquamarine

Beryl (Be3Al2Si6O18)

Pyrite (Fool's Gold) in Matrix

Iron Sulfide (FeS2)

Granite (Alkali-feldspar Granite)

Granite (composed primarily of Quartz, K-Feldspar, and Plagioclase)

Obsidian

Volcanic glass (SiO2-rich amorphous silicate)

Dalmatian Jasper / Dalmatian Stone

Peralkaline Rock (Silicon Dioxide with Amphibole inclusions)

Snowflake Obsidian

Volcanic glass with Spherulite inclusions (SiO2)

Quartzite

Quartzite (SiO2 principal component)

Chalcanthite (Likely Synthetic/Lab-Grown)

Hydrated copper(II) sulfate (CuSO4·5H2O)

Granite

Granite (Phaneritic Igneous Rock; primarily Quartz, Alkali Feldspar, and Plagioclase)

Granite

Phaneritic intrusive igneous rock (composition: Quartz, Alkali Feldspar, Plagioclase Feldspar)

Basalt (River Pebble)

Basalt (Aphanitic Mafic Volcanic Rock)

Granite

Granite (Phaneritic Igneous Rock)

Snowflake Obsidian (Flower Jasper variant)

Vitreous volcanic silicate with cristobalite inclusions

Sparkling Druzy Quartz on Matrix

Silicon Dioxide (SiO2) with iron oxide inclusions

Obsidian

Volcanic Glass (SiO2)

Milky Quartz (Micro-specimen)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky and Smoky variety)

Silicon Dioxide (SiO2)

Sunstone

Oligoclase or Andesine (Labradorite) Feldspar (Na,Ca)(Si,Al)4O8

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Yellow Quartz (Citrine/Quartzite Pebble)

Silicon Dioxide (SiO2)