Mineral With Metamorphic Or Igneous Host

Emerald

Beryl (Be3Al2Si6O18) with trace amounts of Chromium and/or Vanadium

Chert Nodules in Limestone

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Banded Gneiss

Gneiss (variable mineral composition)

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium) CuAl6(PO4)4(OH)8·4H2O

Quartz Pebble

Silicon Dioxide (SiO2)

Nephrite Jade

Tremolite-Actinolite solid solution, Ca2(Mg,Fe)5Si8O22(OH)2

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Pyrite

Pyrite (FeS₂)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gneiss (specifically a water-worn pebble)

Gneiss

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Jasper with Agate and Quartz Inclusions

Silicon Dioxide (SiO2) - Chalcedony / Quartz aggregate

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Black Onyx

Silicon dioxide (SiO2) - Chalcedony variety

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Amethyst

Amethyst (Silicon Dioxide, SiO2 with Iron impurities)

Quartz Pebble (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Crazy Lace Agate

Agate (Cryptocrystalline Quartz), Silicon Dioxide (SiO2)

Precious Opal

Hydrated Silica (SiO2·nH2O)

Chalcopyrite

Chalcopyrite (CuFeS2)

Gneiss

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica/Amphibole)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Sandstone with Ironstone Concretion

Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Pyrite

Iron Disulfide (FeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (specifically Milky/Gray Quartz)

Silicon Dioxide (SiO2)

Vesicular Basalt with Zeolite

Mafic volcanic rock with Hydrated Aluminosilicate minerals (Zeolite group)

Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite

Nuummite

Nuummite (Orthoamphibole rock / Anthophyllite-Gedrite blend)