Mineral With Metamorphic Or Sedimentary Host

Quartz Vein in Mica Schist

Quartz (SiO2) with Muscovite/Biotite Schist

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Yellow Calcite (Carved Egg)

Calcite (Calcium Carbonate, CaCO3)

Quartz Crystal Cluster with Iron Stain

Silicon Dioxide (SiO2)

Gold-bearing quartz vein in dark host rock

Native gold (Au) with quartz (SiO₂), likely in a mafic or metamorphic host

Unidentified translucent mineral fragment, possibly quartz

Likely quartz (SiO₂), though the photograph is insufficient for confident identification

Quartz geode

Quartz, silicon dioxide (SiO₂), likely a chalcedony-lined geode with drusy quartz crystals

Polished metallic ore/mineral specimen, possibly pyrite-bearing schist

Indeterminate from image; likely pyrite (FeS₂) with quartz and/or mica in a metamorphic matrix

Fluorite Geode

Calcium Fluoride (CaF2)

Turquoise

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

Turquoise

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

Geode or Concretion

Silica-based Concretion / Quartz Geode

Manganese Oxide Crust on Limestone

Manganese Oxides (e.g., Pyrolusite MnO2 or Romanechite) on CaCO3

Tumbled chalcedony pebble

Chalcedony, microcrystalline quartz (SiO₂), possibly cream-colored agate

Turquoise

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

Iron sulfide-rich ore, possibly pyrite-bearing gossan

Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing

Worn River Pebble with Fossil Indentation

Sedimentary Rock with Fossil Infill

Quartz (Druzy or Geode fragment)

Silicon Dioxide (SiO2)

Iron-stained quartz vein in altered host rock

Quartz (SiO₂) with iron oxides/hydroxides, likely hematite and goethite; host rock uncertain from the image

Quartz (Druzy)

Silicon Dioxide (SiO2)

Serpentinite

Serpentinite (composed primarily of minerals in the serpentine group: (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Yellow Jasper

SiO2 (Silicon Dioxide)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrous Phosphate of Copper and Aluminum)

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Blue Dumortierite Quartz

Dumortierite in Quartz (AlAl6BSi3O18)

Shale with Quartz Vein

Argillaceous Shale with Silicon Dioxide Vein

Quartz on Host Rock

Silicon Dioxide (SiO2)

Polished green tumbled stone, likely serpentine

Serpentinite (rock composed chiefly of serpentine-group minerals, approximately Mg₃Si₂O₅(OH)₄)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Sapphire

Corundum (Al2O3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in Altered Host Rock

Calcite on Host Rock

Calcium Carbonate (CaCO3)

Fossil ammonite

Ammonite (subclass Ammonoidea; exact species not identifiable from the image)

Amethyst and Agate Geode Section

Silicon Dioxide (SiO2) - Crystalline Quartz and Chalcedony

Milky Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Tumbled carnelian

Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)

Pyrite-bearing rock (likely pyrite in a quartz-rich matrix)

Pyrite, FeS₂, with an unidentified host rock

Peach-colored feldspar (likely potassium feldspar)

Orthoclase or microcline, KAlSi₃O₈

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Limestone (Travertine/Tufa variant)

Calcium Carbonate (CaCO3)