Crystal

Sunstone

Plagioclase Feldspar ((Ca,Na)(Al,Si)4O8)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Amethyst (SiO2 with iron impurities)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F

Obsidian

Volcanic Glass (SiO2)

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartzite Pebble

Quartzite (mostly SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granitic Pegmatite with Tourmaline and Sphalerite

Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)

Rose Quartz

Silicon Dioxide (SiO2) with inclusions of Dumortierite or similar minerals

Smoky Quartz and Chalcedony Geode Fragment

Silicon Dioxide (SiO2)

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

Garnet Schist

Almandine Garnet-Mica Schist (X₃Y₂(SiO₄)₃)

Basalt with Porphyritic Texture

Porphyritic Basalt

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Dalmatian Stone

Peralkaline Quartz-Feldspar Rock with Arfvedsonite

Rutilated Quartz

SiO2 with TiO2 inclusions (Quartz with Rutile)

Rutilated Quartz

SiO2 with TiO2 inclusions

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz Sphere

Silicon Dioxide (SiO2)

Peridotite (Dunite)

Peridotite (mostly Olivine: (Mg,Fe)2SiO4)

Red Quartz (Ferruginous Quartz)

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Milky Quartz with Iron Inclusions

Crystalline Silicon Dioxide (SiO2)

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Cubic Zirconia

Zirconium dioxide (ZrO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Heat-Treated Citrine (Amethyst-based)

Quartz (Silicon Dioxide) - SiO2

Tree Agate (or Moss Agate), faceted into a crystal tower

Dendritic Agate (Silicon Dioxide, SiO2)

Sapphire

Corundum (Al2O3)

Hematoid Quartz

Ferruginous Quartz (SiO2 with Fe2O3 inclusions)

Emerald in Matrix

Emerald (Beryllium Aluminum Silicate), Be3Al2(SiO3)6

Andesite Porphyry (River Cobble)

Porphyritic Andesite

Diorite (Salt and Pepper Rock)

Diorite

Quartz (Milky/Clear Variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Epidosite

Epidosite (predominantly Epidote {Ca2Al2Fe3+Si3O12(OH)} and Quartz {SiO2})

Golden Healer Quartz

Silicon Dioxide (SiO2) with limonite/hematite inclusions

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Porphyritic Basalt

Porphyritic Basalt (containing Plagioclase or Alkali Feldspar phenocrysts)

Quartz (Common Quartz Pebble)

Silicon Dioxide (SiO2)