Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
Mineral
Category
Metamorphic
Browse metamorphic specimens identified by the Rock Identifier community.
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Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Iron-stained garnet-bearing rock, possibly almandine garnet
Garnet-group silicate, likely almandine (Fe₃Al₂Si₃O₁₂), in a quartz–iron-oxide matrix
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Orange Calcite (likely polished specimen)
Calcite
Mineral
Ruby Fuchsite / Ruby in Fuchsite
Ruby (Al2O3 variety corundum) and Fuchsite (K(Al,Cr)2AlSi3O10(OH)2 - a chromium-rich variety of muscovite mica) in Quartz matrix
Mineral
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Gneiss
Banded Metamorphic Rock (Gneiss)
metamorphic
Biotite-rich mica schist
Mica schist, likely containing biotite and quartz with possible feldspar
metamorphic
Likely mica-rich metamorphic rock (schist)
Mica schist, probably biotite–muscovite schist; exact identification requires closer examination
metamorphic
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Greenstone (likely greenschist)
Chlorite–actinolite–epidote-rich metabasalt; mineral proportions cannot be confirmed from the photo
metamorphic
Milky quartz
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Mica schist fragment
Biotite–quartz–feldspar schist
metamorphic
Banded gneiss (likely garnet-biotite or quartz-feldspar gneiss)
Gneiss; predominantly quartz (SiO₂), feldspar, and dark biotite/amphibole
metamorphic
Black Spinel
Magnesium aluminate, MgAl2O4
gemstone
Almandine Garnet
Almandine, Fe3Al2(SiO4)3
mineral
Almandine Garnet
Fe3Al2(SiO4)3
gemstone
Almandine Garnet
Iron Aluminum Silicate (Fe3Al2(SiO4)3)
mineral
Garnet Schist
Mica Schist with Almandine (Fe3Al2(SiO4)3)
metamorphic
Black spinel bead strand
Spinel, magnesium aluminum oxide (MgAl₂O₄)
gemstone
Blue Apatite
Calcium phosphate fluoride, Ca5(PO4)3(F,Cl,OH)
mineral
Black Tourmaline
Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)4)
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Sugilite
KNa2(Fe,Mn,Al)2Si12O30
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Fuchsite
K(Al,Cr)2(AlSi3O10)(OH)2
mineral
Garnet (likely Almandine or Pyrope)
Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3
mineral
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Feldspar in Matrix
Feldspar group minerals in metamorphic or igneous matrix
igneous
Epidosite (Unakite-related)
Epidosite (composed primarily of Epidote and Quartz)
metamorphic
Green garnet (likely tsavorite or demantoid), small polished cabochon
Garnet-group silicate; tsavorite is grossular, Ca₃Al₂(SiO₄)₃, while demantoid is andradite, Ca₃Fe₂(SiO₄)₃
gemstone
Green jade-like cabochon pendant
Unidentified green gem; possibly jadeite (NaAlSi₂O₆) or nephrite (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)
gemstone
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Black tourmaline (likely schorl)
Schorl, NaFe²⁺₃Al₆(BO₃)₃Si₆O₁₈(OH)₄
mineral
Tumbled quartz-rich pebble
Quartz (SiO₂), likely with iron-oxide staining and minor inclusions
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Specular Hematite (Specularite)
Iron(III) oxide (Fe2O3)
mineral
Green Aventurine
Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2
mineral