Mineral

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Rhodochrosite

Manganese carbonate (MnCO3)

Chrysocolla and Malachite Beads

Hydrated copper silicates (Chrysocolla) and Copper carbonate hydroxide (Malachite)

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Granite

Granite, a felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Likely rough garnet

Garnet group, possibly almandine (Fe₃Al₂(SiO₄)₃); identification is uncertain from the image

Quartz-rich rock, likely milky quartz vein material

Quartz (SiO₂), possibly with iron-oxide staining and minor associated minerals

Chrysocolla-bearing copper ore (tentative)

Chrysocolla, a hydrated copper silicate; commonly intergrown with quartz and/or other copper minerals

Limonite

FeO(OH)·n(H2O)

Granite (likely weathered, coarse-grained specimen)

Granite; chiefly quartz, feldspar, and mica

Serpentine (rough serpentine-rich rock)

Serpentine-group minerals, chiefly antigorite and/or lizardite; composition broadly Mg₃Si₂O₅(OH)₄

Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)

Granitic pegmatite; predominantly K-feldspar/plagioclase (KAlSi₃O₈–NaAlSi₃O₈), with quartz and dark mafic minerals

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Banded Gneiss (River Rock/Pebble)

Gneiss (specifically a banded variety often found as a river rock)

Weathered granite boulder

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

Likely garnet crystal fragment

Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)

Chalcopyrite

Copper iron sulfide (CuFeS2)

Blue-gray mineral specimen (possibly sodalite)

Undetermined; appearance may be consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), but the image is insufficient for reliable identification

Likely garnet (rough crystal)

Garnet group; possibly almandine, (Fe₃Al₂(SiO₄)₃)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Potassium Feldspar (Orthoclase)

KAlSi3O8 (Potassium Aluminum Silicate)

Iron-stained brown mineral/rock fragment

Most likely limonite/goethite-rich material (hydrated iron oxides), possibly weathered ironstone; exact identification requires testing

Likely garnet crystal

Garnet-group silicate; species cannot be determined from the image

Weathered granite

Granite, a quartz–feldspar–mica intrusive igneous rock

Tumbled garnet-bearing rock (possible almandine garnet)

Likely almandine garnet, Fe₃Al₂(SiO₄)₃, in a dark host rock; identification is uncertain from the image alone.

Quartz-bearing pegmatitic rock with feldspar

Granitic pegmatite; chiefly quartz (SiO₂), feldspar, and mica

Yooperlite (Sodalite-bearing Syenite)

Sodalite-rich Syenite

Sedimentary Sandstone with Iron Oxide

Ferruginous Sandstone

Pyrite

Iron Sulfide (FeS2)

Granite

Granite, a coarse-grained felsic intrusive igneous rock composed mainly of quartz, feldspar, and mica

Garnet in marble

Likely almandine or pyrope garnet (X₃Y₂(SiO₄)₃) in calcite marble; species cannot be confirmed from the image alone.

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)