Mineral With Metamorphic Or Sedimentary Host

Almandine Garnet

Almandine, Fe3Al2(SiO4)3

Clear quartz crystal fragment

Quartz, silicon dioxide (SiO₂)

Greenstone / Serpentinite

Serpentinite (composed primarily of serpentine minerals: Mg3Si2O5(OH)4)

Quartz (vein quartz)

SiO2 (Silicon Dioxide)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Gold-bearing Quartz

Quartz (SiO2) with associated pyrite or native gold

Red jasper in a gray host rock (likely jasperized volcanic rock)

Microcrystalline quartz (SiO₂), iron-oxide–colored jasper, in a fine-grained volcanic or sedimentary matrix

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Vein Quartz in Basalt or Mafic Rock

Silicon Dioxide (Quartz veins in volcanic host rock)

Schist

Schist (primarily mica-schist)

Green calcite (probable)

Calcite, CaCO₃

Green Tourmaline

Verdelite (Silicate mineral); Na(Li,Al)3Al6(BO3)3Si6O18(OH)4

Amethyst (Quartz variety)

Amethyst [Silicon Dioxide (SiO2)]

Gold-bearing Quartz Vein in Mafic Rock

Hydrothermal Quartz Vein within Greenschist/Amphibolite facies (SiO2 with Au)

Jadeite

Jadeite (NaAlSi2O6)

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

Tumbled blue-green stone, likely aquamarine-bearing pegmatite or blue apatite

Probable fluorapatite, Ca5(PO4)3(F,Cl,OH), though visual identification is uncertain

Pink quartz crystal, possibly rose quartz

Quartz (silicon dioxide, SiO₂), likely pink quartz/rose quartz

Emerald

Beryl (Be3Al2(SiO3)6) with Chromium and/or Vanadium impurities

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Blue Sapphire

Corundum (Al2O3 - Aluminum Oxide)

Quartz geode fragment

Mostly crystalline quartz (SiO₂), likely with chalcedony and minor iron-oxide staining

Chalcedony Geode (Botryoidal Agate)

Silicon Dioxide (SiO2)

Ruby and Diamond in Gold Setting

Corundum (Al2O3) and Diamond (C)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Jasper and Chalcedony Nodule

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Likely garnet-bearing metamorphic rock

Garnet-rich schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Quartz / Common Opal

Silicon Dioxide (SiO2)

Chalcedony (Grey/White Agate)

Silicon Dioxide (SiO₂)

Quartz in Matrix (or Quartz Vein Rock)

Silicon Dioxide (SiO2) with host rock

Lapis Lazuli (in Matrix)

Lazurite-bearing Metamorphic Rock (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Agate

Silicon Dioxide (Chalcedony), SiO2

Chrysoprase-bearing serpentine (probable)

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄, with possible nickel-bearing chrysoprase/opal and iron oxides

Quartz crystal with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Black tourmaline in host rock

Schorl, NaFe3Al6(BO3)3Si6O18(OH)4, likely in quartz or feldspathic matrix

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Vein in Mafic Rock

Quartzite vein in Metabasalt (SiO2 base)

Likely garnet, possibly almandine

Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃

Quartz

Silicon dioxide (SiO2)

Quartz Vein in Matrix

Silicon Dioxide (SiO2)

Greenstone / Serpentinite

Serpentine-group / Altered Mafic Rock