Sedimentary Or Metamorphic (Low Grade)

Anthracite Coal

Anthracite C

Toast

Triticum aestivum (processed)

Satin Spar (Satin Spar Gypsum)

Calcium Sulfate Dihydrate (CaSO4·2H2O)

Shale

Shale (clastic sedimentary rock composed of silt and clay-sized particles)

Rough amber-like brown mineral specimen

Uncertain from photograph; possibly iron-stained quartz, common opal, or resinous amber

Beryl (likely Aquamarine)

Beryllium aluminum silicate (Be3Al2Si6O18)

Black Sand (Magnetite Sand)

Magnetite (Fe3O4)

Gravelly, weathered sediment (likely glacial till)

Unconsolidated diamicton; mixed lithologies, commonly including quartz, feldspar, and weathered silicate rock fragments

Lignite (Brown Coal)

Lignite (C189H155O6N3S)

Ocean Jasper

Orbicular Jasper (Silicon Dioxide, SiO2)

Ocean Jasper

Orbicular Jasper/Microcrystalline Quartz (SiO2)

Blue Apatite

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

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene

Polished green serpentine (likely antigorite-rich)

Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible chlorite, magnetite, and talc

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica inclusions

Morganite and Aquamarine (Beryl) Bracelet

Beryllium aluminum silicate, Be3Al2(SiO3)6

Tumbled green-brown stone, likely serpentine

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

Milky Quartz

Silicon Dioxide (SiO2)

Migmatitic gneiss

Felsic banded gneiss, commonly quartz–feldspar–biotite ± amphibole

Nuummite

Nuummite (Orthoamphibole rock composed of Anthophyllite and Gedrite)

Quartz Vein in Siltstone

Siltstone with Quartz (SiO2) inclusion

Yellow Sapphire (Corundum)

Corundum (Aluminum Oxide, Al2O3)

Fuchsite (Green Muscovite)

K(Al,Cr)2(AlSi3O10)(OH)2

Quartzite

Metamorphosed quartz sandstone

Lapis Lazuli

Lapis Lazuli (Complex metamorphic rock primarily composed of Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2, Calcite, and Pyrite)

White Jade (Nephrite)

Tremolite-Actinolite series [Ca2(Mg,Fe)5Si8O22(OH)2]

Lapis Lazuli (Polished)

Lapis Lazuli (primarily Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli with Pyrite

Lapis lazuli (Mainly Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Serpentinite

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

Lapis Lazuli

Lapis Lazuli (Mineral composition: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite)

Lapis Lazuli

Lapis Lazuli (Complex silicate mixture)

Nephrite Jade

Tremolite-Actinolite solid solution Ca2(Mg,Fe)5Si8O22(OH)2

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Blue Sapphire

Corundum (Al2O3)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Green Tourmaline (Verdelite)

Elbaite (Na(Li,Al)3Al6(BO3)3Si6O18(OH)4)