Mineral With Metamorphic Or Igneous Host

Pegmatite

Igneous Pegmatite

Small quartz-rich stone, possibly milky quartz or quartz-bearing rock

Quartz (SiO₂), identification uncertain from image

Likely faceted colorless gemstone

Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph

Gold-bearing sulfide ore (tentative)

Native gold, likely with pyrite/chalcopyrite in quartz or altered rock

Ruby

Corundum (Al2O3)

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)

Pyrite, FeS₂, dispersed in a dark metamorphic or hydrothermal host rock

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly quartzite or quartz-bearing pegmatite

Ruby

Corundum (Aluminum Oxide with Chromium traces), Al2O3:Cr

Quartzite with Epidote/Chlorite Inclusion

Metamorphic Quartzite (SiO2 with accessory silicate minerals)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor feldspar, mica, and iron-oxide minerals

Weathered copper-bearing rock (likely malachite-stained basalt or greenstone)

Malachite, Cu₂CO₃(OH)₂, as a secondary coating on a mafic host rock; exact identification requires testing

Beryl (likely Emerald or Aquamarine in matrix)

Beryllium aluminum silicate (Be3Al2Si6O18)

Labradorite (rough specimen)

Labradorite, a plagioclase feldspar in the labradorite–bytownite series; approximately (Ca,Na)(Al,Si)₄O₈

Likely quartz-rich rock fragments

Uncertain; probable quartz with iron-oxide staining, possibly mica-bearing metamorphic rock

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Blue faceted gemstone, likely synthetic sapphire or blue spinel

Corundum (Al₂O₃) if sapphire; alternatively magnesium aluminate spinel (MgAl₂O₄)

Basalt with Quartz Vein

Extrusive Igneous Rock / Volcanic Rock

Likely potassium feldspar (orthoclase) fragment

Orthoclase, KAlSi₃O₈ (tentative identification)

Blue Quartz with Dumortierite/Magnesio-riebeckite inclusions

Quartz (SiO2) containing Dumortierite (Al7(BO3)(SiO4)3O3)

Likely garnet-bearing rock (possibly almandine garnet in dark matrix)

Garnet, probably almandine (Fe₃Al₂(SiO₄)₃); host rock is not identifiable from this image

Quartz on Greenstone

Silicon Dioxide (SiO2) on Altered Igneous Geologic Unit

Quartz Vein in Schist / Gneiss Metamorphic Matrix

Silicon Dioxide (SiO2) in metamorphic schist host rock

Purple cabochon gemstone, likely amethyst or purple sapphire/spinel

Indeterminate from image; possible quartz (SiO₂), corundum (Al₂O₃), or spinel (MgAl₂O₄)

Blue Quartz (or Blue Aventurine)

Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)

Parti Sapphire

Corundum (Al2O3)

Agate

Agate (Silicon Dioxide, SiO2)

Gabbro or Diorite with Felsic intrusion

Mafic to intermediate intrusive igneous rock with felsic vein/inclusion

Quartz–feldspar pegmatite

Granitic pegmatite, chiefly quartz (SiO₂), feldspar, and mica

Rough Emerald

Emerald (Beryl), Be3Al2(SiO3)6

Raw Emerald in Matrix

Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities

Quartz-bearing rock fragment, likely quartz vein in basalt or dark host rock

Quartz (SiO₂) with probable mafic host, possibly basalt or amphibolite

Red gemstone ring, likely synthetic ruby or red glass

Unidentified red faceted stone; ruby is corundum (Al₂O₃)

Quartz Pebble

Crystalline Silica (SiO2)

Mixed Mineral Collection (with Quartz, Beryl, and host rock)

Silicon Dioxide (Quartz), Be3Al2Si6O18 (Beryl), and associated Schist/Pegmatite

Jadeite (Jade)

NaAlSi2O6 (Sodium Aluminum Silicate)

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Banded Agate

Cryptocrystalline Silica (SiO2)

Granite cobble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)