Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Category
Sedimentary Or Metamorphic (Low Grade)
Browse sedimentary or metamorphic (low grade) specimens identified by the Rock Identifier community.
Learn about Sedimentary Or Metamorphic (Low Grade) in the encyclopedia
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Tiger Iron / Banded Iron Formation
Banded Iron Formation (SiO2 with Fe2O3 and FeOOH)
metamorphic
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Variscite
Variscite (AlPO4·2H2O)
mineral
Optical Calcite (Iceland Spar)
Calcite (Calcium Carbonate, CaCO3)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Milky Quartz with Iron Staining
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite (Oxidized Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Rough Quartz in Pegmatite Matrix
Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite
igneous
Granitoid Gneiss with Feldspar Vein
Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)
metamorphic
Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)
Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Sapphirine in Magnesian Schist
Sapphirine: (Mg,Al)8(Al,Si)6O20
metamorphic
Mica-rich schist
Muscovite–biotite schist, commonly quartz-bearing
metamorphic
Gneiss
Gneiss
metamorphic
River Rock (Granitic Gneiss)
Foliated Granitic Gneiss
metamorphic
Biotite Schist
Biotite Schist (predominantly K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Unidentified Rock Fragment
Unknown
Rock
Diamond (Uncut Crystal)
Carbon (C)
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Eclogite
Eclogite (Pyrope-Omphacite rock)
metamorphic
Garnet (Almandine)
Almandine Garnet (Fe3Al2(SiO4)3)
gemstone
Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral
Potassium Feldspar (Orthoclase / Microcline)
KAlSi3O8
mineral
Lazulite
Magnesium Aluminum Phosphate Hydroxide (MgAl2(PO4)2(OH)2)
mineral
Tumbled orange calcite
Calcite (calcium carbonate, CaCO₃)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Clear Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Marble
Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)
metamorphic
Green Aventurine
Quartzite (variety Aventurine) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)
metamorphic
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
metamorphic
River Rock (likely Gneiss or Quartzite)
Metamorphic rock specimen (potentially Foliated Gneiss)
metamorphic
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Granitic Gneiss
Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)
metamorphic
Gneiss
Gneiss (quartz-feldspar-biotite gneiss)
metamorphic
Clear Quartz (Rock Crystal)
Quartz (Silicon Dioxide, SiO2)
mineral