Mineral In Metamorphic Rock

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂) with iron-oxide staining and minor feldspar/mica

Gneiss

Foliated Metamorphic Rock (Gneiss)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartzite Pebble

Quartzite (mostly SiO2)

Quartz-veined Metamorphic Rock

Quartz-veined Schist or Gneiss

Gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Schist

Schist (metamorphic rock)

Gneiss

Metamorphic Gneiss

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Schist

Mica Schist (Metamorphic Rock)

Schist

Schist (Crystalline metamorphic rock)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Small weathered mineral/rock fragment

Unidentified; likely quartz-rich material, possibly quartzite or feldspar-bearing rock

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Grey River Stone (Gneiss/Schist mix)

Foliated Metamorphic Rock (variable mineral formula)

Quartz-veined metamorphic rock, likely greenschist or altered metavolcanic

Chlorite–actinolite–epidote-bearing metavolcanic rock with quartz veins; exact identification requires testing

Small tumbled pebble (likely quartz or feldspar)

Indeterminate; probable quartz (SiO₂) or feldspar

Quartz-rich metamorphic rock (likely quartzite)

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

Mica-rich metamorphic rock, likely phyllite or mica schist

Muscovite- and/or biotite-bearing schist/phyllite; exact identification requires testing

Weathered quartz-rich metamorphic rock, possibly gneiss or quartzite

Quartz–feldspar–mica metamorphic aggregate; exact identification requires testing

Mica-rich metamorphic rock, likely schist

Quartz–mica schist; commonly quartz with muscovite and/or biotite mica

Quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly crystalline SiO₂, with probable iron-oxide staining and minor feldspar/mica

Likely quartz-rich metamorphic rock (quartzite)

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible mica and feldspar

Fine-grained dark metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly quartz, mica, and chlorite

Quartz-rich metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), with dark biotite, amphibole, or iron-oxide inclusions

Foliated mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly garnet-bearing

Weathered quartz-rich metamorphic rock (probable quartzite or gneiss fragment)

Quartzite–gneiss type specimen; chiefly SiO₂ (quartz) with feldspar, mica, and iron-oxide staining

Mica-rich metamorphic rock, likely phyllite or schist

Quartz–mica schist/phyllite; chiefly muscovite or biotite mica with quartz and feldspar

Quartz-rich metamorphic rock, likely quartzite

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

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline to granular SiO₂, possibly with mica and feldspar

Pyrite in Quartz Matrix

Iron Sulfide (FeS2) embedded in Silicon Dioxide (SiO2)

Aventurine

Aventurine Quartz (SiO2 with inclusions)

Greenstone pebble (likely altered basalt or serpentine)

Greenschist-facies mafic rock; commonly chlorite–actinolite–epidote ± serpentine

Weathered quartz-rich metamorphic rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining and dark inclusions

Quartz-rich metamorphic rock, likely milky quartzite

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

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole + plagioclase feldspar

Muscovite Mica

Muscovite / KAl2(AlSi3O10)(OH)2

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Banded Gneiss

Gneiss (Metamorphic Rock)