Man Made Metamorphic Style Composite

Emerald / Fluorite

Beryl (Be3Al2Si6O18) / Fluorite (CaF2)

Smoky Quartz

Silicon Dioxide (SiO2)

Quartz (Milky/Rose variety)

Silicon Dioxide (SiO2)

Quartz (Common Milky Quartz)

Silicon Dioxide (SiO2)

Orthoclase (Potassium Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Blue Dumortierite Quartz

AlAl6BSi3O18 (Dumortierite) within SiO2 (Quartz)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Mica Schist

Foliated Metamorphic Rock (Schist)

Greenstone (likely serpentinite or chlorite-rich metamorphic rock)

Probable serpentinite/chlorite schist; commonly dominated by serpentine-group minerals, chlorite, talc, and magnetite

Tumbled green-and-white stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and carbonate veins

Smoky Quartz

Silicon Dioxide (SiO2)

Smoky Quartz (Tumbled)

Silicon Dioxide (SiO2)

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Banded gneiss pebble

Gneiss, commonly quartz–feldspar–mica gneiss

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Ruby (in costume jewelry context)

Corundum (Al2O3) with Chromium impurities

Serpentinite with carbonate veins

Serpentinite; chiefly serpentine-group minerals (antigorite/lizardite, Mg₃Si₂O₅(OH)₄) with white calcite or magnesite veins

Tumbled pale greenish stone, likely serpentine or altered limestone

Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only

Fine-grained dark igneous rock, likely basalt

Basalt; predominantly plagioclase feldspar and pyroxene, commonly with minor olivine and iron-titanium oxides

Red Jasper

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite

Limestone

Calcium Carbonate (CaCO3)

Sandstone (likely Graywacke or Arkosic varieties)

Arenite (composed primarily of SiO2)

Weathered gray metamorphic rock, likely phyllite or slate

Micaceous quartz–phyllosilicate rock; commonly quartz + muscovite/illite ± chlorite

Polished greenstone pebble

Nephrite jade (compact tremolite–actinolite amphibole), possibly serpentine

Polished blue-green stone, likely serpentine or chrysocolla-bearing rock

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Pink Quartzite

Quartzite (SiO2) with inclusions

Quartzite Pebble (with iron staining)

Quartzite (SiO2 with ferric oxide impurities)

Quartzite

Metamorphic Quartzite (primarily SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO₂)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Quartzite Cobble

Quartzite

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Serpentinite

Serpentinite (Mg, Fe, Ni)₃Si₂O―(OH)₄

Siltstone or Fine-grained Sandstone pebble

Siltstone (primarily SiO2 with clay minerals)

Serpentinite (serpentinized ultramafic rock)

Serpentine-group minerals, chiefly lizardite and antigorite; commonly derived from peridotite

Dark green metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc

Polished or tumbled jasper

Microcrystalline quartz (SiO₂), commonly iron-oxide-rich jasper