Igneous And Metamorphic Derivative (Weathered)

Clear Quartz Crystal Cluster

Silicon Dioxide (SiO2)

Rough Corundum (Sapphire/Ruby mixture)

Corundum (Aluminum Oxide, Al2O3)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Smoky Quartz

Silicon dioxide with aluminum impurities (SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Peacock Ore

Bornite (Cu5FeS4)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Strawberry Quartz (or Hematoid Quartz)

Silicon Dioxide (SiO2) with inclusions of Hematite or Goethite

Quartz (Milky/Gray variety)

Silicon Dioxide (SiO2)

Red Garnet (Almandine-Pyrope series)

Garnet Group, Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Milky Quartz

Silicon Dioxide (SiO2)

Plagioclase Feldspar

Plagioclase Feldspar Series (NaAlSi3O8 - CaAl2Si2O8)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Pyrite in Matrix

Iron Sulfide (FeS2)

Mica (Muscovite)

Potassium aluminum silicate - KAl2(AlSi3O10)(OH)2

Smoky Quartz

Silicon Dioxide (SiO2)

Green Opal

Hydrated Silica (SiO2·nH2O)

Aventurine (Green Aventurine)

Quartz with Fuchsite Inclusions (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Schist

Mica Schist

Magnetite

Magnetite (Fe3O4)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Greenschist

Greenschist (composed of Chlorite, Actinolite, and Epidote)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Sandstone (Iron-stained)

Clastic sedimentary rock (SiO2 with Fe2O3 staining)

Chert (Flint nodule)

Chert (SiO2)

Chert (Flint)

Silicon Dioxide (SiO2)

Chert (Jasper/Jasperoid)

Chert (chemically precipitated microcrystalline Quartz, SiO2)

Chert (Jasper variety)

Microcrystalline quartz (SiO2)

Banded Agate

Silicon Dioxide (SiO2) - Chalcedony variety

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Flint Nodular Variety)

Microcrystalline Quartz (SiO2)

Greenstone with Epidote or Quartz Vein

Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)