Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Category
Mineral (Metamorphic Pseudomorph)
Browse mineral (metamorphic pseudomorph) specimens identified by the Rock Identifier community.
Plagioclase Feldspar (specifically Albite/Oligoclase)
(Na,Ca)(Si,Al)4O8
mineral
Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Amazonite
K(AlSi3O8)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Greenstone
Metamorphosed Mafic Igneous Rock
metamorphic
Lapis Lazuli
Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)
metamorphic
Mica Schist
Mica Schist (Complex Silicate Rock)
metamorphic
Pyrite
Iron Disulfide (FeS2)
mineral
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Iron-stained Quartz (SiO2 with Fe2O3 impurities)
mineral
Prase quartz with actinolite inclusions
Silicon dioxide (SiO2) with Calcium Magnesium Iron Silicate Hydroxide inclusions
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Quartz (with Iron staining)
Silicon Dioxide (SiO2)
mineral
Zircon
Zirconium Silicate (ZrSiO₄)
mineral
Blue Quartz (Dumortierite Quartz)
Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite in Quartz Matrix
Rhodonite (Manganese Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Gneiss (specifically Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Serpentine Schist with Quartz Vein
Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).
Metamorphic
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Schist
Mica Schist
metamorphic
Orthoclase Feldspar (Potassium Feldspar)
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Orthoclase Feldspar (Twinning Specimen)
Orthoclase (KAlSi3O8)
mineral
Black Tourmaline
Schorl (NaFe3Al6(BO3)3Si6O18(OH)4)
mineral
Banded Agate (with possible Chalcedony layers)
Silicon dioxide (SiO2)
sedimentary
Yellow Aventurine (specifically a carved crescent moon)
Silicon Dioxide (SiO2) with inclusions
mineral
Green Aventurine
Silicon Dioxide (SiO2) with Fuchsite inclusions
metamorphic
Yellow Aventurine (Quartz Quartzite)
Silicon Dioxide with Mica inclusions (SiO2 + KAl2(AlSi3O10)(OH)2)
Metamorphic
Charoite
Charoite, K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Mica Schist
Mica Schist (KAl2(AlSi3O10)(OH)2 in Matrix)
metamorphic
Peacock Ore
Bornite (Cu5FeS4)
mineral
Garnet Schist
Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Pearl and Garnet Glass
Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass
mineral and glass