Mineral Variant

Veined Sandstone with Calcite Veins

Sedimentary sandstone with hydrothermal/mineral veins

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Pyrite or Chalcopyrite specimen (Gold-colored mineral coating)

Iron Sulfide (FeS2) / Copper Iron Sulfide (CuFeS2)

Limonite

FeO(OH)•nH2O

Polished garnet bead (likely almandine)

Almandine garnet, Fe₃Al₂(SiO₄)₃ (tentative visual identification)

Pink Granite Gneiss

Gneiss (High-grade metamorphic rock)

Likely serpentine

Serpentine-group minerals, chiefly antigorite, lizardite, or chrysotile; approximate formula Mg₃Si₂O₅(OH)₄

Weathered, iron-stained granite (possible granitic gneiss)

Granite, a quartz–feldspar–mica plutonic rock; visual identification is uncertain

Quartz with Sericite and Cinnabar

Silicon Dioxide (SiO2) with muscovite/sericite and mercury sulfide (HgS)

Fluorite

Calcium Fluoride (CaF2)

Raw dark metallic mineral specimen, possibly native gold-bearing quartz or sulfide ore

Uncertain from image; possible pyrite/chalcopyrite-bearing quartz or gold-bearing sulfide matrix

Rainbow Fluorite

Fluorite (Calcium Fluoride, CaF2)

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Granite

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

Serpentine (rough serpentine-rich rock)

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

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)

Chrysocolla-bearing copper ore (tentative)

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

Potassium Feldspar (Orthoclase)

Orthoclase (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Banded Gneiss

Gneiss (Felsic to Mafic Metamorphic Rock)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Likely rough garnet

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

Limonite

FeO(OH)·n(H2O)

Quartz-rich rock, likely milky quartz vein material

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

Mica Schist

Metamorphic rock dominated by micas (muscovite, biotite)

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