Mineral And Metamorphic Rock

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Decorative polished pebbles

Likely mixed quartz-rich lithologies, including quartzite, jasper, and/or basalt

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Schist

Mica Schist

Jasper and Epidote Breccia

Silicified Brecciated Rock with Epidote

Gneiss

Gneiss (Foliated Metamorphic Rock)

Raw garnet-rich metamorphic rock

Likely garnet-bearing schist or garnetite; garnet-group silicates, commonly almandine (Fe₃Al₂Si₃O₁₂)

Greenschist (Greenstone)

Chlorite Schist / Greenschist Facies Rock

Marble

Recrystallized Calcite (CaCO3)

Agate

Silicon Dioxide (Chalcedony), SiO2

Granitic Gneiss

Gneiss (quartz-feldspar-mica complex)

Milky quartz in a quartz-rich rock

Quartz, silicon dioxide (SiO₂); likely massive quartz or quartzite fragment

Clear Quartz / Diamond (untested)

Silicon Dioxide (SiO2) or Carbon (C)

Tumbled white quartz (likely carved quartz pendant/bead)

Quartz, silicon dioxide (SiO₂)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded gneiss

Gneiss, commonly quartz–feldspar–biotite gneiss

Marble

Recrystallized Calcite (CaCO3) Rock

Quartz

Silicon Dioxide (SiO2)

Quartz-rich stone tool or shaped mineral specimen

Likely milky quartz or quartzite (SiO₂); exact material cannot be confirmed from the image

Pyrite in Matrix

Iron Sulfide (FeS2) embedded in host rock

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz-rich rock, likely milky quartz vein material

Mostly quartz (SiO₂); exact rock type cannot be determined from the image alone

Marble

Recrystallized Carbonate Rock (CaCO3)

Schist with Quartz Veins

Schist with Quartz (SiO2)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Chrysotile Asbestos

Mg3Si2O5(OH)4

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with minor dark inclusions

Likely epidote-bearing rock or weathered chalcopyrite specimen

Epidote-group mineral, possibly with chalcopyrite; identification uncertain from image

Quartz vein in metamorphic rock

Crystalline Silicon Dioxide (SiO2) in Host Rock

Weathered metamorphic pebble, likely greenstone

Probable greenschist or chlorite-rich metabasalt; exact identification requires testing

Quartz-bearing granite or pegmatite fragment

Likely granitic material composed mainly of quartz (SiO₂), feldspar, and possibly biotite or hornblende

Granitic Gneiss

Gneiss (high-grade metamorphic rock)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Foliated metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica gneiss/schist; exact identification requires petrographic examination

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Schist (Micaceous Schist)

Mica Schist

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) vein cutting through host rock

Likely weathered gneiss or mica-rich schist

Foliated metamorphic rock, probably quartz–feldspar–biotite gneiss/schist

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Gneiss

Biotite–quartz–feldspar gneiss

Milky quartz

Quartz (silicon dioxide, SiO₂)