Mineral In Metamorphic Rock

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Gneiss

Foliated Metamorphic Rock

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Mica Schist

Foliated Metamorphic Rock (rich in Muscovite or Biotite)

Mica-bearing metamorphic rock, likely schist

Muscovite–biotite schist, possibly phyllite

Weathered metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably quartz–mica-rich phyllite (exact identification requires testing)

Foliated metamorphic rock, likely slate or phyllite

Fine-grained metapelite; commonly quartz–mica–chlorite with possible graphite

Likely quartz-rich metamorphic rock (quartzite or milky quartz)

Quartzite; predominantly quartz (SiO₂), possibly with feldspar and iron-oxide staining

Biotite-bearing metamorphic rock, likely schist

Mica schist; chiefly quartz, feldspar, and biotite mica

Gneiss

Gneiss (Metamorphic Rock)

Garnet (almandine or pyrope variety)

Silicate mineral Group: (Fe, Mg, Mn, Ca)3(Al, Fe, Cr)2(SiO4)3

Weathered iron-rich metamorphic rock, possibly schist or metabasalt

Provisional identification: chlorite–quartz–feldspar schist or altered basalt; exact mineralogy requires testing

Micaceous iron-rich metamorphic rock (probable schist)

Biotite–muscovite quartz schist, possibly containing hematite or sulfide minerals

Likely quartz-rich metamorphic rock (quartzite)

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar or mica impurities

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with minor iron-oxide staining and possible feldspar/mica

Gneiss (with Quartzite layers)

Gneissic Metamorphic Rock

Weathered slate or phyllite

Foliated metamorphic rock, commonly quartz–mica–chlorite assemblage

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Schist

Schist (metamorphic rock)

Slate

Foliated Metamorphic Rock

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Quartz-rich metamorphic rock, likely mica schist or quartzite

Quartz (SiO₂) with mica, feldspar, and possibly iron-oxide staining

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with minor feldspar, mica, or iron oxides

Dark metamorphic rock, likely biotite schist or hornblende-bearing gneiss

Probable mica schist/amphibolite; composition may include biotite, amphibole, quartz, feldspar, and iron oxides

Coarse-grained metamorphic rock, likely gneiss or schist

Probable biotite-quartz-feldspar gneiss/schist; exact identification requires a fresh surface and tests

Quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly microcrystalline quartz, SiO₂)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with possible iron-oxide and mica impurities

Quartz-rich metamorphic rock (likely quartzite)

Quartzite, composed predominantly of quartz (SiO₂), with minor iron-oxide and mica impurities

Banded metamorphic rock, likely mica schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist; principally muscovite mica, biotite, quartz, and feldspar

Dark metamorphic rock, possibly schist

Mica schist (probable; commonly quartz + muscovite/biotite, with possible graphite or chlorite)

Quartz in Matrix (Lepidolite or Quartzite)

Silicon Dioxide (SiO2) with host rock

Likely tumbled greenstone (identity uncertain)

Greenstone: metamorphosed mafic volcanic rock, commonly composed of chlorite, actinolite, and epidote

Pyrite

Iron Disulfide (FeS2)

Likely raw mica-bearing metamorphic rock or mineral fragment

Tentatively biotite schist; visually similar dark mica-rich material

Garnet-bearing metamorphic rock, likely mica schist

Biotite–garnet schist; commonly includes quartz, feldspar, biotite, and almandine garnet

Biotite Mica Schist

Metamorphic Rock containing Biotite K(Mg,Fe)3AlSi3O10(OH)2

Biotite-rich gneiss (possibly mica schist)

Quartz–feldspar–biotite gneiss; mica-rich metamorphic rock

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with feldspar, mica, and iron-oxide staining

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Mica-rich metamorphic rock, likely biotite schist

Biotite–quartz schist; probable composition of quartz, biotite, feldspar, and minor sulfide or iron-oxide minerals