Sedimentary And Metamorphic Minerals

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Likely tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Orange Calcite

Calcium Carbonate (CaCO3)

Weathered metamorphic rock, possibly schist or gneiss

Indeterminate; likely quartz–feldspar–mica rock, potentially greenschist or gneiss

Tumbled pale greenish stone, likely serpentine or altered limestone

Probable serpentine-group rock (antigorite/lizardite), possibly serpentinite; identification is visual only

Coarse-grained gray metamorphic rock, likely gneiss or granitic gneiss

Quartz–feldspar–mica gneiss; exact identification requires petrographic or chemical testing

Gneiss (Metamorphic Pebble)

Gneissic Metamorphic Rock

Tumbled milky quartz (likely quartz pebble)

Quartz, silicon dioxide (SiO₂)

Banded Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss

Garnet Schist or Garnet-bearing Quartzite

Metamorphic rock containing Almandine Garnet (Fe3Al2(SiO4)3) and Quartz (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Banded gneiss pebble

Gneiss, composed chiefly of quartz, feldspar, and mica/amphibole

Rounded river pebble

Unidentified fine-grained clastic rock, possibly sandstone or mudstone

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Brecciated rock (possibly fault breccia)

Polymictic breccia; exact lithology cannot be determined from the photograph

Gneiss

High-grade regional metamorphic rock (Foliated Gneiss)

Gneiss

Gneiss

Quartz

Quartz (SiO2 - Silicon Dioxide)

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz

Silicon Dioxide (SiO2)

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Gneiss

Gneiss

Garnet Schist

Almandine-bearing Mica Schist

Quartz Pebble

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Feldspar (specifically Orthoclase or Plagioclase)

Potassium Aluminum Silicate (KAlSi3O8) or Sodium/Calcium Aluminum Silicate

Gneiss

Gneiss

Tumbled pale quartz (possibly milky quartz or calcite)

Quartz, SiO₂; visual identification is uncertain because the specimen is poorly lit and polished

Polished hematite

Hematite (Fe₂O₃), likely a tumbled iron-oxide specimen

Quartz (Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Grain/Fragment)

Silicon Dioxide (SiO2)

Quartz (specifically Milky or Clear Quartz)

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Likely chlorite-bearing schist (possibly greenschist)

Chlorite–quartz–mica schist; commonly contains muscovite/biotite and feldspar

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)