Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Category
Metamorphic Or Mineral
Browse metamorphic or mineral specimens identified by the Rock Identifier community.
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Mica (Biotite or Phlogopite variety)
Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)
mineral
Clear Quartz (Faceted) or Cubic Zirconia / Glass imitation
SiO2 (if Quartz), ZrO2 (if Cubic Zirconia)
mineral
Quartz with Chlorite inclusions
SiO2 with (Mg,Fe)3(Si,Al)4O10(OH)2⋅(Mg,Fe)3(OH)6
mineral
Sapphire
Corundum (Al2O3)
mineral
Magnetite
Magnetite (Fe3O4)
mineral
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Schist
Mica Schist
metamorphic
Spessartine Garnet in Quartz/Feldspar Pegmatite
Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar
Mineral in Igneous Rock
Aquamarine
Beryl (Be3Al2(SiO3)6)
gemstone
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Granitic gneiss (weathered, rounded cobble)
Foliated granitoid; primarily quartz, feldspar, and mica (composition commonly approximates granite)
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
Slate
Slate; fine-grained metamorphosed shale, commonly composed of quartz, illite/muscovite, and chlorite
metamorphic
Pink Granite Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Grey River Stone (Gneiss/Schist mix)
Foliated Metamorphic Rock (variable mineral formula)
metamorphic
Blue apatite (likely dyed or enhanced)
Apatite group; fluorapatite, Ca5(PO4)3F, is the common blue variety
mineral
Quartz (Orange/Pink variety)
Silicon Dioxide (SiO2)
mineral
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
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Uncertain small stone; possibly weathered quartz-bearing rock
Indeterminate from image; candidate materials include quartz-rich pebble or altered silicate rock
mineral
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
Muscovite Mica
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Quartz (Yellow/Citrine Variety)
Silicon Dioxide (SiO2)
mineral
Likely amphibolite
Amphibolite, composed mainly of hornblende and plagioclase feldspar
metamorphic