Feldspar
Potassium Feldspar (KAlSi3O8)
mineral
Category
Metamorphic And Mineral
Browse metamorphic and mineral specimens identified by the Rock Identifier community.
Greasy Quartz (likely carved Milky Quartz or Aventurine)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Grainy Variety)
Silicon Dioxide (SiO2)
mineral
Gneiss (specifically Amphibolite Gneiss)
Gneiss
metamorphic
Banded Slate or Siltstone with Quartz/Calcite Veins
Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)
metamorphic
Greenstone (Epidote/Chlorite-rich Metabasalt)
Greenschist / Epidosite (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Mica Schist
Mica Schist
metamorphic
Fulgurite
Fulgurite (Lechatelierite-rich variety)
metamorphic
Charoite
K(Ca,Na)2Si4O10(OH,F)·H2O
metamorphic
Red Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Fe2O3 inclusions)
metamorphic
Anyolite (Ruby in Zoisite)
Zoisite with inclusions of Hornblende and Ruby (Ca2Al3(SiO4)3(OH))
metamorphic
Gneiss
Gneiss
metamorphic
Yellow Apatite Sphere (Polished)
Fluorapatite / Ca5(PO4)3F
mineral
Mica Schist
Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Lapis Lazuli
Lazurite-rich metamorphic rock (approx. Na6Ca2(Al6Si6O24)(S,SO4,Cl)1,2)
metamorphic
Sapphire
Corundum (Al2O3)
mineral
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
Mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Quartzite / Carnelian Agate
Silicon Dioxide (SiO2)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)
metamorphic
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Gneiss (Pebble)
Gneiss
metamorphic
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Serpentinite (often containing Jadeite/Nephrite)
Antigorite-rich Serpentine Rock, (Mg, Fe)3Si2O5(OH)4
metamorphic
Biotite Mica
K(Mg,Fe)3AlSi3O10(OH)2
Mineral in a matrix (likely quartz or feldspar)
Tourmaline (likely Schorl)
Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4
Mineral
Marble
Recrystallized Calcite Rock (CaCO3)
metamorphic
Ruby in Fuchsite (often sold as Ruby in Zoisite)
Corundum (Al2O3) in Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Tiger's Eye (Rough)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Banded Gneiss
Gneiss
Metamorphic
Pink Quartzite
Quartzite (SiO2)
metamorphic
Gneiss
Gneiss (High-grade regional metamorphic rock)
metamorphic
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Green Aventurine
SiO2 (Silicon Dioxide with inclusions of Fuchsite mica)
mineral
Gneiss
Gneiss
metamorphic
Schist
Mica Schist
metamorphic
Quartz Vein in Host Rock (Likely Slate or Shale)
Hydrothermal Quartz (SiO2) in Pelitic host rock
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)
metamorphic
Mica Schist
Mica Schist (Composition typically contains Muscovite: KAl2(AlSi3O10)(OH)2 or Biotite: K(Mg,Fe)3AlSi3O10(OH)2 along with Quartz and Feldspar)
metamorphic
Gneiss
High-grade metamorphic rock (Gneiss)
metamorphic
Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic