Sedimentary Or Metamorphic

Quartz (Milky Quartz with Iron Staining)

Silicon Dioxide (SiO2)

Ruby in Zoisite

Ruby (Corundum, Al2O3) in Zoisite (Calcium aluminum silicate hydroxide, Ca2Al3(SiO4)3(OH)) with some Hornblende

Milky Quartz

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Chert

Silicon dioxide (SiO2)

Calcite (likely a tumbled specimen)

Calcite (CaCO 3 )

Garnet

Garnet Group (complex nesosilicates with general formula X3Y2(SiO4)3, where X can be Ca, Mg, Fe2+, Mn2+ and Y can be Al, Fe3+, Cr3+, V3+)

Granite (with Almandine Garnet inclusions)

Granite composed primarily of Quartz (SiO2), K-Feldspar (KAlSi3O8), and Almandine Garnet (Fe3Al2(SiO4)3)

Schist

Schist (various compositions)

Quartzite

Quartzite (primarily SiO2)

Green Quartzite

Metamorphic rock primarily composed of Silicon Dioxide (SiO2) with mineral inclusions like fuchsite or chlorite

Emerald

Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.

Sapphire (Corundum variety)

Sapphire (Al₂O₃)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Tiger's Eye

Tiger's Eye (a variety of Chalcedony, which is a microcrystalline quartz with fibrous inclusions of oxidized crocidolite)

Sandstone (Ferruginous)

Arenite (Fe-oxide cemented)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Iron Oxide cement)

Shale

Fissile Mudstone

Sandstone (Ferruginous)

Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)

Pink Quartzite

Quartzite (SiO2)

Biotite (Black Mica)

Biotite [K(Mg,Fe)3(AlSi3O10)(F,OH)2]

Muscovite Mica (with Quartz matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Orthoclase Feldspar

Potassium Aluminum Silicate (KAlSi3O8)

Gastropod Steinkern (Internal Mold Fossil)

Gastropoda (Class); Internal mold or 'Steinkern' composed of Calcium Carbonate (CaCO3) or Sedimentary matrix

Green Quartz (Prasiolite/Adventurine)

Silicon Dioxide (SiO2) with inclusions

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Labradorite

Labradorite (Ca, Na)(Al, Si)4O8

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide (SiO2) containing iron impurities

Serpentine (Serpentinite)

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

Rough Sapphire

Corundum (Al2O3)

Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Muscovite Mica (on Quartz Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Green Aventurine

SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)

Clear Quartz

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Raw Green Aventurine

Aventurine Quartz (SiO2 + Fuchsite)

Yellow Jade (Nephrite or Jadeite)

Nephrite: Ca2(Mg, Fe)5Si8O22(OH)2; Jadeite: NaAlSi2O6

Agate (Banded Chalcedony)

Agate (Silicon Dioxide, SiO2)