Mineral With Metamorphic Or Igneous Host

Chalcopyrite in Quartz (Gold Ore Matrix)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Greenstone

Greenschist (composed of chlorite, actinolite, and epidote)

Quartz in Matrix

Silicon Dioxide (SiO2)

Quartz Vein / Quartzite Specimens

Silicon Dioxide (SiO2)

Likely garnet (rough crystal)

Garnet group, likely almandine (Fe₃Al₂(SiO₄)₃); identification from the image is uncertain

Quartz Vein in Schist / Gneiss

Silicon Dioxide (SiO2) in Metamorphic Matrix

Native Gold

Native Gold (Au)

Milky Quartz

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite KAl2(AlSi3O10)(OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

Quartz Pebble

Silicon Dioxide (SiO2)

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon dioxide (SiO2) veins in metamorphic/igneous host rock

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly iron-stained or included in a mixed rock; exact identification is uncertain from the image

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Tumbled or naturally etched mica-rich mineral specimen, likely muscovite

Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica

Likely polished bronzite or serpentine-rich rock

Probable bronzite, an iron-bearing orthopyroxene (Mg,Fe)SiO₃; exact identification requires testing

Garnet

Almandine (Fe3Al2(SiO4)3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) in matrix

Milky Quartz

Silicon Dioxide (SiO2)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz Vein in Basalt or Slate

Hydrothermal quartz vein traversing mafic host rock

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

Labradorite (a variety of Feldspar)

Labradorite; (Na,Ca)(Al,Si)4O8 (a plagioclase feldspar)

Quartz-bearing rock fragment

Likely quartz (SiO₂) with iron-oxide staining and possible feldspar/matrix minerals

Likely rose quartz

Quartz (SiO₂), variety rose quartz

Milky quartz

Quartz (SiO₂), likely massive milky quartz with minor iron-oxide staining and inclusions

Ptygmatic Migmatite

Migmatite (consisting of Neosome and Paleosome fractions)

Dumortierite Quartz

Dumortierite-bearing Quartz (SiO2 with Al7BO3(SiO4)3O3)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Citrine (Heat-treated Amethyst)

Silicon Dioxide (SiO2) with iron impurities

Red garnet crystal (possible almandine)

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Tumbled white quartz pebble

Quartz, silicon dioxide (SiO₂), likely milky quartz

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)