Mineral In Metamorphic Rock

Veined quartz-bearing metamorphic rock

Likely quartzite or siliceous schist with iron-oxide staining

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Foliated Metamorphic Rock (likely Gneiss or Schist)

Gneissic Metamorphic Rock

Schist

Schist

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), possibly with mica or iron-oxide impurities

Likely mica-rich metamorphic rock (schist)

Muscovite–biotite schist; composition commonly quartz + feldspar + mica

Foliated metamorphic rock (likely slate or phyllite)

Slate/phyllite; chiefly quartz, mica, and chlorite

Light-colored metamorphic rock, likely quartzite or marble

Quartzite (mostly SiO₂) or calcitic marble (mostly CaCO₃); image resolution prevents confident distinction

Dumortierite Quartz (Blue Quartz)

Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)

Greenschist

Greenschist facies metamorphic rock; commonly chlorite–actinolite–epidote schist

Garnet-Mica Schist

Garnetiferous Porphyroblastic Schist

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Gneiss

Gneiss (Metamorphic Rock)

Gneiss

Gneiss (Metamorphic Rock)

Quartz with Mica/Schist inclusion

Silicon Dioxide (SiO2) with Phyllosilicates

Slate

Foliated Metamorphic Rock

Likely quartz-bearing metamorphic rock

Probably quartzite or quartz-rich schist; mainly quartz (SiO₂), possibly mica and feldspar

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Small red-brown mineral or rock fragment

Unidentified; possibly iron-oxide-rich jasper, garnet, or weathered sulfide

Banded Gneiss

Gneiss (Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Dark gray foliated metamorphic rock, likely slate or phyllite

Slate/phyllite; chiefly fine-grained mica and quartz, with possible chlorite and carbonaceous matter

Quartz-veined dark metamorphic rock, likely schist or gneiss

Quartz-bearing mica schist/gneiss; mainly quartz (SiO₂), feldspar, mica, and iron-oxide staining

Feldspar

Feldspar (Orthoclase/Microcline)

Gneiss

Gneiss (Metamorphic rock)

Gneiss

Foliated Metamorphic Rock

Quartz Vein in Amphibolite / Gneiss

Quartz (SiO2) in Mafic Metamorphic Host Rock

Quartz-rich metamorphic rock, likely mica schist

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

Polished gray-brown stone slab, possibly soapstone or schist

Indeterminate; likely talc-rich soapstone (steatite) or mica schist

Biotite-bearing metamorphic rock, likely schist

Mica schist; quartz–feldspar–biotite assemblage

Blue-gray foliated metamorphic rock, likely slate or phyllite

Slate (fine-grained metamorphosed shale), possibly phyllite; mineral proportions cannot be confirmed from the image

Dark foliated metamorphic rock, probably schist

Mica schist, likely quartz–muscovite/biotite schist

Gneiss

Gneiss (Metamorphic Rock)

Iron-rich metamorphic rock, likely specular hematite-bearing schist

Hematite–quartz–mica schist (tentative)

Milky Quartz

Silicon Dioxide (SiO2)

Dark metamorphic rock, likely biotite-rich schist or amphibolite

Biotite–quartz–feldspar schist/amphibolite; exact identification requires testing

Quartz with Mafic/Chlorite Veins

Silicon Dioxide (SiO2) with Chlorite/Epidote cross-veining

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)3Si3O10(OH)2)

Schist

Schist (Foliated Metamorphic Rock)

Mica Schist

Metamorphic Rock (Schistose)

Unidentified gray metamorphic rock, likely schist or gneiss

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

Pyrite in Matrix

Iron Disulfide (FeS2)