Mineral And Metamorphic Rock

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Greenschist

Chlorite schist

Quartz Pebble

Silicon Dioxide (SiO2)

Garnet

Garnet Group (Silicate Minerals), formula varies e.g., Almandine Fe3Al2(SiO4)3

Pyrite

Iron Disulfide (FeS2)

Hag Stone

Perforated Sedimentary Rock

Banded Agate (Carnelian variety)

Cryptocrystalline Quartz (SiO2)

Sodalite

Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2)

Sodalite

Na8(Al6Si6O24)Cl2

Emerald (Beryl)

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

Druzzy Quartz on Matrix

Silicon Dioxide (SiO2)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic volcanic rock including secondary mineral infills)

Granite Cobble

Granite (Phaneritic Igneous Rock)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Citrine (Heat-treated or Natural Quartz)

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Sandstone (Pebble)

Arenite (primarily SiO2)

Sandstone

Arenite (SiO2 principal)

Sandstone

Arenite (primarily SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Sandstone

Arenite (primarily SiO2)

Blue Chalcedony

Silicon Dioxide (SiO2)

Sandstone (with man-made markings)

Arenite (composed primarily of Quartz, SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Picture Sandstone)

Sandstone (primarily Quartz with Iron Oxide impurities)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Greenstone

Greenschist (containing chlorite, epidote, and actinolite)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Quartzite Pebble

Quartzite (primarily SiO2)

Granodiorite

Granodiorite (intermediate plutonic rock)

Tiger's Eye

Silicon Dioxide with inclusions (SiO2)

Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Quartz Crystal (specifically a Double-Terminated variety)

Silicon Dioxide (SiO2) - Low Quartz

Quartz (Milky Quartz vein fragment)

Silicon Dioxide (SiO2)

Nephrite Jade

Tremolite-actinolite series (Ca2(Mg,Fe)5Si8O22(OH)2)

Sandstone (likely with Quartz Veining)

Arenite (primarily SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Prehnite

Prehnite - Ca2Al(AlSi3O10)(OH)2