Gneiss
Gneiss (High-grade Metamorphic Rock)
Category
Browse metamorphic mineral specimens identified by the Rock Identifier community.
Gneiss
Gneiss (High-grade Metamorphic Rock)
Gneiss
Gneiss
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
Dragon Blood Jasper (Lizard Stone/Septarian Chalcedony)
Epidote with Black Hornblende and White Quartz mixture
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
Quartz Pebble
Silicon Dioxide (SiO2)
Greenschist / Chloritaform Schist
Chlorite Schist (Group of Silicate Minerals)
Feldspathic Gneiss
Feldspathic Gneiss (High-grade regional metamorphic rock)
Mica Schist with Quartz
Mica Schist (principally Muscovite and Biotite with Quartz veins)
Clear Quartz
Silicon Dioxide (SiO2)
Potassium Feldspar
Orthoclase (KAlSi3O8)
Quartz pebble
Silicon dioxide (SiO2)
Ferruginous Quartz (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
Green Aventurine
Aventurine Quartz (SiO2 with inclusions)
Mica Schist
Muscovite/Biotite Schist
Hematite
Iron(III) oxide (Fe2O3)
Pyrite
Iron Sulfide (FeS2)
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
Banded Gneiss
Gneiss
Smoky Quartz
Silicon Dioxide (SiO2)
Banded Agate
Silicon Dioxide (SiO2) - Variety Agate
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Green Quartz (Prasiolite or Aventurine)
Silicon Dioxide (SiO2)
Citrine
Silicon Dioxide (SiO2) with Fe3+ impurities
Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
Citrine (Heat-Treated Amethyst)
Silicon Dioxide (SiO2)
Aventurine
Aventurine Quartz (SiO2)
Agate
Chalcedony (Cryptocrystalline variety of Quartz, SiO2)
Black Tourmaline (Schorl)
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
Citrine Quartz
Silicon Dioxide (SiO2)
Citrine
Citrine (Silicon Dioxide, SiO2)
Agate
Cryptocrystalline Quartz (SiO2)
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
Smoky Quartz (Rough Specimen)
Silicon Dioxide (SiO2)
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
Clear Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz Pebbles
Silicon Dioxide (SiO2)