Biotite Mica
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Category
Igneous Or Metamorphic
Browse igneous or metamorphic specimens identified by the Rock Identifier community.
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Garnet Gneiss
Gneiss containing Almandine Garnet
metamorphic
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Milky Quartz (Water-worn pebble/nodule)
Quartz (Silicon Dioxide - SiO2)
mineral
Banded Gneiss
Gneiss (Metamorphic rock)
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
metamorphic
Gneiss
Metamorphic rock (Gneiss)
metamorphic
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Granitic Pegmatite
Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)
igneous
Greenstone
Metamorphic mafic rock (greenschist facies)
metamorphic
Milky Quartz with Talc / Serpentine
Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2
metamorphic
Gneiss
Gneiss
metamorphic
Lapis Lazuli
Lapis Lazuli (Rock composed primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)
metamorphic
Greenstone
Chlorite schist or Epidosite
metamorphic
Garnet
Almandine/Pyrope Garnet (X3Y2(SiO4)3)
gemstone
Magnetite (Iron Ore)
Iron(II,III) oxide (Fe3O4)
mineral
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Almandine Garnet
Iron aluminum silicate (Fe3Al2(SiO4)3)
mineral
Garnet
Almandine formula: Fe3Al2(SiO4)3
mineral
Rough Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Gneiss (Banded Gneiss Cobble)
Gneiss
metamorphic
Milky Quartz with Matrix
Silicon Dioxide (SiO2)
mineral
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Greenstone (Prase / Nephrite / Serpentine mix)
Metamorphosed ultramafic rock / greenstone facies
metamorphic
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
K-Feldspar (Potassium Feldspar)
Potassium Feldspar (Microcline / Orthoclase, KAlSi3O8)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Microcline Feldspar
KAlSi3O8
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Iron-stained River Pebble)
Silicon Dioxide (SiO2)
mineral