Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
Category
Browse man made metamorphic style composite specimens identified by the Rock Identifier community.
Magnetite or Hematite (Iron Stone)
Magnetite (Fe3O4) or Hematite (Fe2O3)
Emerald In Matrix
Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium
Pearl (likely Freshwater or Akoya Cultured)
Aragonite / Conchiolin composite (CaCO3)
Slate
Slate (Regional metamorphic rock composed primarily of quartz, illite, and chlorite)
Unakite
Unakite (Metasomatized Granite)
Quartz with Pyrite
Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
Quartz
Quartz (SiO₂)
Quartzite
Quartzite (chiefly SiO2)
White Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
Red Quartzite
Quartzite (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
Quartzite
Quartzite (Primary mineral: SiO2)
Lapis Lazuli
Lapis Lazuli (a rock composed primarily of Lazurite, Sodalite, Calcite, and Pyrite)
Banded Agate
Cryptocrystalline Quartz (SiO2)
River Quartz / Quartzite Pebbles
Quartzite (primarily Silicon Dioxide, SiO2)
Quartzite (River Pebble)
Quartzite (SiO2)
Citrine
Silicon Dioxide (SiO2) with iron impurities
Milky Quartz
Silicon Dioxide (SiO2)
Veined Quartz
SiO2 (Silicon Dioxide)
Raw quartz crystal
Quartz (silicon dioxide, SiO₂)
Polished banded agate slab or agate-look decorative stone
Microcrystalline quartz (chalcedony), SiO₂; exact identification is uncertain from the image
Greenstone
Greenschist (composed of chlorite, actinolite, and epidote)
White Quartz
Quartz (SiO2)
Quartz (Milky/Yellowish)
Silicon Dioxide (SiO2)
Ruby
Corundum (Al2O3 with Chromium trace impurities)
Limonite (Iron Ore)
Hydrous Iron Oxide (goethite, lepidocrocite)
Granite Cobble/Pebble
Granite
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
Banded gneiss pebble
Gneiss, commonly quartz–feldspar–mica gneiss
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
Milky quartz (rough quartz specimen)
Quartz, silicon dioxide (SiO₂)
Citrine Quartz
Silicon Dioxide (SiO2) with iron impurities
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
Iron Ore (Magnetite-Hematite)
Magnetite (Fe3O4) and Hematite (Fe2O3)
Quartzite
Quartzite (SiO2)
Quartz
Quartz (SiO₂)
Quartzite
Quartzite (chiefly SiO2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Unakite
Unakite (altered granitic rock)
Banded gneiss
Gneiss; typically quartz–feldspar–mica assemblage