Mineral (Pseudomorph)

Opal

Hydrated Amorphous Silica (SiO2·nH2O)

Petrified Wood

Silicified Wood (SiO2)

Raw Emerald in Schist Matrix

Beryl (Be3Al2Si6O18) in Mica Schist

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Native Copper within Host Rock

Native Copper (Cu)

Amethyst

Silicon Dioxide (SiO2) with traces of Iron (Fe3+)

Snowflake Obsidian

Spherulitic Obsidian (primarily SiO2 with Cristobalite inclusions)

Gold flakes

Native Gold (Au)

Quartz Geode (Druzy)

Crystalline Silicon Dioxide (SiO2)

Amethyst

Silicon dioxide with iron impurities (SiO2)

Amethyst

SiO2 (Silicon Dioxide with iron impurities)

Ruby in Zoisite (Anyolite)

Anyolite (Combination of Corundum and Zoisite)

Fuchsite

Chrome-bearing Muscovite [K(Al,Cr)2(AlSi3O10)(OH)2]

Orange Calcite with Siderite/Iron Oxide Coating

Calcium Carbonate (CaCO3)

Moonstone

Adularia (orthoclase) or Albite (plagioclase), a potassium aluminum silicate of the feldspar group

Amethyst

Silicon Dioxide with Iron impurities (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Amethyst (Tumbled)

Quartz (Silicon Dioxide, SiO2) with iron impurities

Herkimer Diamond

Quartz (Silicon Dioxide) - SiO2

Garnet Beads

Garnet Group (complex nesosilicates, e.g., Almandine Fe3Al2(SiO4)3)

Rose Quartz

Silicon Dioxide (SiO2)

Iron Gossan (Limonite/Goethite)

Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (High-purity SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Red Sandstone

Arenite (Ferruginous Sandstone)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Granite

Granite (Phaneritic Igneous Rock / Quartz, Feldspar, Mica)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Granite (Pink/Red Orthoclase variety)

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8, CaAl2Si2O8)

Granite

Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)

Moonstone

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

Greenschist

Greenschist (chlorite-epidote schist)

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Green Aventurine

Aventurine (a variety of Quartz, SiO2 with fuchsite inclusions)

Amygdaloidal Basalt

Vesicular Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)

Sodalite

Sodalite (Na8Al6Si6O24Cl2)

Mica Schist

Mica Schist (Main mineral constituents: Muscovite/Biotite, Quartz, Feldspar)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with included minerals (Fuchsite for green)