Mineral (Synthetic)

Possible weathered metallic mineral specimen

Uncertain; possibly native copper-bearing rock or iron sulfide in a gray host matrix

Copper-bearing Quartz Vein in Host Rock

Quartz with Malachite/Chrysocolla staining

Serpentinite

Serpentinite, a rock composed mainly of serpentine-group minerals (approximately Mg₃Si₂O₅(OH)₄)

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Chrysocolla-bearing copper ore (tentative)

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

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Likely rough garnet

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

Limonite

FeO(OH)·n(H2O)

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

Quartz-rich rock, likely milky quartz vein material

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

Iron-stained brown mineral/rock fragment

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

Blue-gray mineral specimen (possibly sodalite)

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

Banded Gneiss (River Rock/Pebble)

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

Weathered granite

Granite, a quartz–feldspar–mica intrusive igneous rock

Weathered feldspar-rich pegmatite (likely orthoclase or plagioclase)

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

Likely garnet (rough crystal)

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

Chalcopyrite

Copper iron sulfide (CuFeS2)

Rhodochrosite

Manganese carbonate (MnCO3)

Chrysocolla and Malachite Beads

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

Sandstone with Mineral Veining or Crust

Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)

Likely garnet crystal fragment

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

Quartz-bearing pegmatitic rock with feldspar

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

Likely garnet crystal

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

Yooperlite (Sodalite-bearing Syenite)

Sodalite-rich Syenite

Gneiss with Quartz Veining

Gneiss (High-grade Metamorphic Rock)

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)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Orthoclase Feldspar with Quartz

Orthoclase (KAlSi3O8)

Banded gneiss

Foliated gneiss, likely quartz–feldspar–biotite or amphibole gneiss

Granitic Gneiss

Gneiss (Metamorphic Rock)

Carved Sea Turtle Figurine (Aventurine / Quartz / Jasper)

Quartz variety (SiO2) / Polycrystalline Quartz Aggregate

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Dark mineral nodule with white veining

Possibly a calcite-veined manganese- or iron-rich concretion; exact identification requires testing

Sedimentary Sandstone with Iron Oxide

Ferruginous Sandstone

Banded Sedimentary Rock

Sedimentary rock with mineral veins/banding

Granite

Intrusive igneous rock

Gneiss

Gneiss

Geode half

Geode (often quartz/chalcedony based)