Mineral And Metamorphic Rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Almandine Garnet in Schist

Almandine, Fe3Al2(SiO4)3

Milky quartz with iron-oxide staining

Quartz (silicon dioxide, SiO₂), likely a translucent massive variety

Unidentified gray rock/mineral specimen

Indeterminate; possibly quartz-rich rock or a metallic sulfide-bearing specimen

Mixed Tumbled Rocks and Minerals Collection

Mixed Minerals and Rocks (Quartz, Feldspar, Jasper, Agate, Lapis Lazuli, Sodalite, Rose Quartz, Fluorite, etc.)

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (high-grade metamorphic rock)

Likely biotite-bearing schist or gneiss

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Tiny rounded brown mineral grain

Indeterminate; possibly iron oxide, garnet, or a weathered sulfide grain

Green Aventurine

Aventurine Quartz (SiO2 + Cr-bearing Mica inclusions)

Tiger Iron

Tiger Iron (Hematite, Red Jasper, and Tiger's Eye)

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic silicate rock)

Quartz crystal

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Milky quartz (iron-stained quartz)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic

Quartz

Silicon Dioxide (SiO2)

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Garnet-bearing Schist / Conglomerate Specimen

Metamorphic rock with almandine garnet porphyroblasts

Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Likely weathered quartz-rich rock, possibly granite or gneiss

Granite–gneiss assemblage; chiefly quartz, feldspar, and dark mica/amphibole

Quartz Vein in Siltstone

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

White Quartz

Silicon Dioxide (SiO2)

Biotite gneiss (probable)

Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar

Gneiss

Gneiss (High-grade metamorphic rock)

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8) with inclusions of Albite

Weathered schist or gneiss

Quartz–feldspar–mica metamorphic rock

Gneiss (River Cobble)

Gneiss

Metamorphic schist, possibly chlorite–biotite schist

Schist; composition likely quartz, feldspar, mica (biotite/muscovite), and chlorite

Milky quartz (quartzite possible)

Quartz, silicon dioxide (SiO₂)

Banded metamorphic rock, likely banded gneiss

Gneiss, probably biotite–quartz–feldspar gneiss

Tumbled quartz-rich pebble

Quartz (SiO₂), likely with iron-oxide staining and minor inclusions

Green Aventurine

Silicon Dioxide (Quartz with Fuchsite inclusions) - SiO2

Tumbled or weathered gneiss

Feldspar–quartz–mica gneiss (composition variable)

Garnet-bearing Schist

Almandine Garnet [Fe3Al2(SiO4)3] in Micaceous Schist

Quartz vein in Schist

Crystalline Silicon Dioxide (SiO2) in Metamorphic Host

Rounded gray metamorphic rock, likely quartzite or gneiss

Quartz-rich metamorphic rock; exact identification is uncertain from the photograph

Weathered foliated metamorphic rock, likely schist or gneiss

Micaceous schist/gneiss; composition likely quartz, feldspar, mica, and altered mafic minerals

Gneiss

Gneiss (High-grade metamorphic rock)