Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
metamorphic
Category
Metamorphic And Mineral
Browse metamorphic and mineral specimens identified by the Rock Identifier community.
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Slate
Slate; fine-grained metamorphosed shale, commonly composed of quartz, illite/muscovite, and chlorite
metamorphic
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
gemstone
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Blue apatite (likely dyed or enhanced)
Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety
mineral
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Small rounded mineral/rock fragment
Indeterminate; possibly quartz-rich stone or feldspar
mineral
Quartz with Actinolite or Tourmaline inclusions
Silicon Dioxide (SiO2) with Ca2(Mg,Fe)5Si8O22(OH)2 or Tourmaline group inclusions
igneous
Tumbled quartz pebble
Quartz, silicon dioxide (SiO₂)
mineral
Ruby (Corundum)
Corundum (Aluminum Oxide with Chromium), Al2O3:Cr
mineral
Gneiss
Foliated Metamorphic Rock
metamorphic
Quartz Mineral
Silicon Dioxide (SiO2)
mineral
Chrysotile Asbestos
Mg3Si2O5(OH)4
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Quartz Vein in Hematitic Siltstone
Hydrothermal Quartz (SiO2) in Ferriferous Matrix
metamorphic
Polished rhodonite
Rhodonite, manganese inosilicate (MnSiO₃)
mineral
Pyrite Nodules / Weathered Pyrite
Iron Sulfide (FeS2)
mineral
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Morganite and Aquamarine (Beryl) Bracelet
Beryllium aluminum silicate, Be3Al2(SiO3)6
gemstone
Uncertain small stone; possibly weathered quartz-bearing rock
Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock
mineral
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Pink potassium feldspar (orthoclase/microcline)
KAlSi₃O₈; likely massive potassium feldspar, possibly with quartz
mineral
Likely garnet-bearing schist or gneiss
Mica schist/gneiss containing quartz, feldspar, mica, and possible almandine garnet
metamorphic
Dark gneiss or migmatitic amphibolite
Band ed gneiss; composition likely quartz–feldspar–biotite/amphibole, possibly migmatite
metamorphic
Polished banded metamorphic stone, likely gneiss or quartzite
Banded quartz–feldspar–mica rock; precise identification requires testing
metamorphic
Quartz (Yellow/Citrine Variety)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Likely amphibolite
Amphibolite, composed mainly of hornblende and plagioclase feldspar
metamorphic
Banded Serpentine
Serpentine group (subgroup Lizardite or Antigorite) - Mg3Si2O5(OH)4
metamorphic
Banded gneiss pebble
Gneiss, likely quartz–feldspar–mica gneiss
metamorphic
Coarse-grained gray metamorphic rock, likely gneiss
Biotite–quartz–feldspar gneiss (probable)
metamorphic
Likely biotite-rich schist or gneiss
Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica
metamorphic
Banded marble (probable calcite marble)
Calcite marble, CaCO₃; possibly impure dolomitic marble
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Biotite (Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)
mineral
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
Garnet in Matrix (likely Almandine in Quartz/Mica Schist)
Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock
metamorphic
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
Green Aventurine
Silicon dioxide (SiO2) with inclusions of Fuchsite mica
metamorphic
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Actinolite-Tremolite series)
metamorphic