Mineral In Metamorphic Rock

Pyrite

Iron Sulfide (FeS2)

Likely quartz-rich metamorphic rock fragment

Probable quartzite or quartz-bearing schist; exact identification is uncertain from the image

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, possibly with mica or feldspar

Weathered mafic metamorphic rock, likely amphibolite or hornblende gneiss

Amphibolite; primarily hornblende amphibole and plagioclase feldspar, with possible biotite, quartz, and iron oxides

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂ with minor iron-oxide staining and possible feldspar/mica

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly phyllite; composition dominated by mica and quartz

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite (mostly SiO₂), possibly ferruginous mica-bearing quartzite

Quartz-rich metamorphic rock, likely quartzite

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

Weathered quartz-rich metamorphic rock, likely quartzite

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

Small rounded mineral/rock fragment

Indeterminate; possibly quartz-rich stone or feldspar

Schist

Schist

Quartz-rich metamorphic rock, likely quartzite

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

Dark foliated metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist

Spessartine Garnet in Quartz/Feldspar Pegmatite

Spessartine (Mn3Al2(SiO4)3) in Quartz (SiO2) and Feldspar

Banded gneissic rock

Gneiss, likely quartz–feldspar–biotite gneiss

Gneiss

Gneissic Metamorphic Rock

Fuchsite

Chromium-rich Muscovite Mica

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Garnet (likely Almandine or Pyrope)

Garnet (Group Name), Fe3Al2(SiO4)3 or Mg3Al2(SiO4)3

Pyrite-bearing metamorphic rock (likely schist or gneiss)

Pyrite (FeS₂) in a quartz–mica-rich host rock

Quartz (Milky or Smoky Quartz Pebble)

Silicon Dioxide (SiO2)

Schist

Mica Schist (contains muscovite/biotite and quartz)

Green Gneiss

Metamorphic Gneiss

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly quartz-bearing

Weathered quartz-rich metamorphic rock (probable quartzite or quartz vein rock)

Quartz-dominant rock; chiefly SiO₂, with minor iron-oxide and mica/clay impurities

Weathered quartz-rich metamorphic rock, possibly quartzite

Quartzite (mostly SiO₂), with probable iron-oxide staining and minor feldspar/mica

Banded metamorphic rock, likely gneiss or banded amphibolite

Undetermined foliated metamorphic rock; commonly quartz–feldspar–biotite gneiss or amphibolite

Quartz-rich metamorphic rock, likely mica schist

Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite, predominantly microcrystalline quartz (SiO₂), with iron-oxide staining and dark mica or amphibole inclusions

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-mica schist; predominantly SiO₂ quartz with iron-oxide staining

Weathered dark metamorphic rock, likely slate or phyllite

Fine-grained foliated rock, probably slate/phyllite; exact identification requires testing

Mica-rich metamorphic rock, likely schist

Muscovite- or biotite-bearing schist; composition commonly quartz + mica ± feldspar

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Dark mafic metamorphic rock, likely amphibolite

Amphibolite; chiefly hornblende amphibole and plagioclase feldspar

Weathered quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor iron-oxide staining and possible mica/clay minerals

Biotite-rich schist

Mica schist, chiefly quartz + biotite mica (variable feldspar and garnet)

Pyrite-bearing metamorphic rock (likely greenschist or phyllite)

Quartz–chlorite–mica schist/phyllite with disseminated pyrite (FeS₂)

Educational Geologic Collection

Mixed Mineral and Rock Collection (Various compositions)

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Metamorphic rock)

Weathered quartz-rich metamorphic rock, likely quartzite

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

Mica-rich metamorphic rock, likely schist

Biotite–muscovite schist; composition may include quartz and feldspar