Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
Category
Browse sedimentary or metamorphic derived specimens identified by the Rock Identifier community.
Gneiss (specifically a weathered or stream-worn specimen)
Gneiss (Foliated Metamorphic Rock)
Sunstone
Aventurine Feldspar ((Ca,Na)(Al,Si)4O8)
Smoky Quartz with Calcite/Quartz Veining
Silicon Dioxide (SiO2)
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusions of AlAl6BSi3O18
Smoky Quartz
Silicon Dioxide (SiO2)
Sapphire
Corundum (Al2O3)
Specular Hematite (Specularite)
Hematite (Alpha-Fe2O3)
Citrine
Silicon Dioxide (SiO2)
Green Quartz (Prasiolite/Adventurine/Jasper)
Silicon Dioxide (SiO2)
Amethyst
Silicon Dioxide (SiO2) with iron impurities
Smoky Quartz
Silicon Dioxide (SiO2)
Quartz Druze on Matrix
Silicon Dioxide (SiO2)
Muscovite Mica
Muscovite: KAl2(AlSi3O10)(OH)2
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Strawberry Quartz (Lepidocrosite/Hematite-Included Quartz)
Quartz (Silicon Dioxide) with Lepidocrosite or Hematite inclusions (SiO2 + Fe2O3 · nH2O)
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
Moonstone
Potassium aluminum silicate (KAlSi3O8) with Albite (NaAlSi3O8)
Smoky Quartz (Polished)
Silicon Dioxide (SiO2)
Banded Agate
Cryptocrystalline Quartz (SiO2)
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
Citrine
Silicon dioxide (SiO2)
Yellow Quartz (Citrine/Iron-Stained Quartz)
Silicon Dioxide (SiO2)
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
Smoky Quartz (with possible Garnet inclusions)
Silicon Dioxide (SiO2)
Magnetite (likely in Hematite or Ironstone)
Magnetite (Fe3O4)
Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)
Silicon Dioxide (SiO2)
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Milky Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Quartz (Milky/Cloudy Variety)
Silicon Dioxide (SiO2)
Pyrite
Iron Disulfide (FeS2)
Schorl (Black Tourmaline)
Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
Rhodonite
Manganese Inosilicate (MnSiO3)
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Banded Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
Gneiss (Metamorphic Rock)
Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)
White Quartz Star-cut crystal
Silicon Dioxide (SiO2)
Blue Calcite
Calcium Carbonate (CaCO3)