Metamorphic

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Serpentine

Antigorite/Lizardite (Mg,Fe)3Si2O5(OH)4

Alexandrite

Chrysoberyl (BeAl2O4 with Chromium impurities)

Pyrite

Iron Sulfide (FeS2)

Aquamarine

Beryl (Be₃Al₂Si‑₆O₁₈)

Beryl (Aquamarine) in Matrix with Schorl

Be3Al2Si6O18 (Beryl) with NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Citrine

Silicon Dioxide (SiO2)

Amethyst

SiO2 (Silicon Dioxide with Iron impurities)

Green Adventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Grey Slate

Foliated Metamorphic Rock (formed by low-grade regional metamorphism of shale or mudstone)

Strawberry Quartz

Quartz with Hematite inclusions (SiO2 + Fe2O3)

Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Tumbled Moonstone

Feldspar (Orthoclase/Albite), KAlSi3O8

Yellow Calcite

Calcium Carbonate (CaCO3)

Labradorite

Labradorite ((Ca, Na)(Al, Si)4O8)

Citrine

Silicon dioxide (SiO2)

Dumortierite Quartz

Dumortierite (Al7BCuO15)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Quartzite

Metamorphic Rock (Mainly SiO2)

Mica Schist

Foliated Metamorphic Rock (Schist)

Garnet (likely Almandine)

Almandine - Fe3Al2(SiO4)3

Schist (Graphite or Mica rich)

Crystalline Schist (often containing Muscovite, Biotite, or Graphite)

Quartzite pebble

Metamorphic Quartzite (primarily SiO2)

Quartzite Pebble (with Iron Inclusions)

Metamorphic Rock (Mainly SiO2)

Quartzite

Metamorphic Rock (Mainly SiO2)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Quartzite

Metamorphic Quartzite (predominantly SiO2)

Pink Quartzite

Silica (SiO2) - Metamorphic rock

Quartzite pebble

Metamorphic rock (mainly SiO2)

Orange Quartzite

Metamorphic Quartzite (primarily SiO2)

Quartzite

Metamorphic rock (primarily SiO2)

Quartzite (River Cobble)

Metamorphic Quartz-rich Rock

Quartzite River Rock

Metamorphic Quartzite (primarily SiO2)

Schist

Crystalline Metamorphic Rock (Schistose)

Quartzite Pebble

Metamorphic Quartzite (primarily SiO2)

Gneiss

High-grade Metamorphic Gneiss