Mineral With Metamorphic Or Igneous Host

Serpentinite

Serpentine group minerals ((Mg, Fe)3Si2O5(OH)4)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within a metamorphic matrix

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Red Quartz

Silicon Dioxide (SiO2) with Hematite inclusions

Agate in Rhyolite

Silicon Dioxide (Quartz/Chalcedony) in Volcanic Rock matrix

Milky quartz (with minor dark inclusions)

Quartz, silicon dioxide (SiO₂)

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Carnelian (Chalcedony)

SiO2 (Silicon Dioxide - Microcrystalline Quartz)

Milky quartz vein rock

Quartz, silicon dioxide (SiO₂), likely with iron-oxide staining and minor mica or sulfide minerals

Quartz-rich pegmatite fragment

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible biotite or tourmaline

Gold-bearing quartz vein rock (probable pyrite-rich schist or quartzite)

Quartz (SiO₂) with iron sulfides, chiefly pyrite (FeS₂), and possible native gold

Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)

Veined Metabasalt / Veined Greywacke

Likely dark green-black tumbled stone (possibly serpentine)

Unconfirmed; appearance is consistent with serpentine, a group of hydrated magnesium silicate minerals

Pyrite in Slate

Iron Sulfide (FeS2) in Slate host matrix

Lapis Lazuli

Complex metamorphic rock containing Lazurite ((Na,Ca)8(AlSiO4)6(SO4,S,Cl)2), Calcite, and Pyrite

Magnetite

Magnetite (Fe3O4)

Blue Lace Agate

Silicon Dioxide (SiO₂), a variety of Chalcedony

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Serpentine-rich serpentinite

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and chromite

Raw Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Polished serpentine (likely bowenite/antigorite)

Serpentine-group minerals, chiefly antigorite or lizardite: Mg₃Si₂O₅(OH)₄

Garnet in Schist

Almandine Garnet in Mica-Schist (Fe3Al2(SiO4)3)

Chrysocolla on Matrix

Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Emerald in Matrix

Beryl (Be3Al2Si6O18)

Pyrite (likely)

Pyrite, FeS₂

Red gemstone ring, likely garnet or synthetic ruby

Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish

Pyrite Cubes in Matrix

Iron Disulfide (FeS2) in Host Matrix

Pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and mica

Fluorite in Matrix

Calcium Fluoride (CaF2) with Quartz/Calcite matrix

Amethyst-rich vesicular volcanic rock (probable amethyst basalt/scoria)

Quartz (SiO₂) in vesicular basaltic volcanic rock; precise identification requires testing

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Polished magnetite-rich ironstone (probable magnetite/hematite nodule)

Magnetite, Fe₃O₄, possibly mixed with hematite, Fe₂O₃, and iron-bearing gangue

Quartz Vein in Mica Schist

Quartz (SiO2) with Muscovite/Biotite Schist

Quartz with Feldspar and Mica (Pegmatite Fragment)

Granitic Pegmatite

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Gold-bearing quartz vein in dark host rock

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

Blue faceted gemstone ring, likely synthetic sapphire or blue topaz

Uncertain from image; possible corundum (Al₂O₃) or topaz (Al₂SiO₄(F,OH)₂)

Kunzite (variety of Spodumene)

Lithium Aluminum Silicate (LiAlSi2O6)

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

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

Tourmaline-bearing pegmatite (likely black schorl in a pale quartz/feldspar matrix)

Schorl tourmaline, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄, with quartz and feldspar