Mineral With Artificial Coating

Tumbled green aventurine (probable)

Quartzite dominated by quartz (SiO₂), with green mica/fuchsite or chlorite inclusions

Citrine (Heat-Treated Amethyst)

Quartz (SiO2)

Sandstone (Nut-stone / Cup-stone artifact)

Quartz Arenite / Worked Sedimentary Rock

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety colored by irradiation-related defects

Tumbled smoky quartz

Quartz (SiO₂), smoky variety

Peacock ore (bornite/chalcopyrite specimen)

Bornite, Cu₅FeS₄, commonly with chalcopyrite (CuFeS₂)

Fossilized bivalve shell fragment

Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image

Weathered iron-rich basalt or volcanic rock

Fine-grained mafic rock, likely basalt with iron-oxide weathering (hematite/goethite)

Green jade-like cabochon pendant

Possibly nephrite (fine-grained tremolite–actinolite); the photo alone cannot confirm the material

Likely rough garnet crystal

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

Black kyanite

Kyanite, Al₂SiO₅

Likely faceted garnet

Garnet group, commonly almandine (Fe₃Al₂(SiO₄)₃); identification from the photo is uncertain

Quartz with Limonite Staining

Silicon Dioxide (SiO2) with Hydrated Iron Oxide (FeO(OH)·nH2O)

Red Sandstone

Sedimentary Clastic Rock (Quartz Arenite)

Red Sandstone

Ferruginous Sandstone (SiO2 with Iron Oxide)

Chrysocolla

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Polished black stone sphere (likely black basalt or black tourmaline)

Most likely fine-grained basalt (plagioclase–pyroxene); mineral identification is uncertain from the image alone

Likely ironstone pebble

Iron-oxide-rich concretion, composed mainly of goethite and/or hematite

Tumbled reddish-brown quartz (likely iron-stained quartz)

Quartz, SiO₂; likely colored by iron-oxide inclusions or surface staining

Iron-rich metamorphic rock (probable garnet-bearing schist or quartzite)

Garnet–quartz–mica schist/quartzite; composition likely quartz (SiO₂), iron oxides/hydroxides, mica, and possible almandine garnet

Dalmatian Stone

Peralkaline igneous rock containing quartz, feldspar, and arfvedsonite

Weathered sandstone or iron-rich quartzite fragment

Quartz-dominated siliciclastic rock; likely ferruginous sandstone (SiO₂-rich)

Vesicular basalt

Basalt, predominantly plagioclase + pyroxene ± olivine; vesicles formed by trapped volcanic gas

Iron-rich brown rock, possibly limonite/goethite

Limonite (hydrated iron oxides; commonly goethite, FeO(OH), with hematite)

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate), likely mixed with malachite, limonite, and quartz

Quartz geode or druzy quartz nodule

Quartz, silicon dioxide (SiO₂), likely iron-oxide-stained chalcedony/quartz

Likely tumbled or polished dark purple mineral

Possibly amethyst (purple quartz, SiO₂), though the image is insufficient for confident identification

Iron-rich rock fragment (likely limonite/goethite weathering material)

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and/or limonite (variable mixture)

Limonite/goethite-rich ironstone

Hydrated iron oxides, chiefly goethite (α-FeO(OH)) and limonite (FeO(OH)·nH₂O)

Pink Quartz (likely dyed)

Silicon Dioxide (SiO2)

Druzy Quartz on Limestone

Silicon Dioxide (SiO2)

Weathered granite or granitic rock

Granite; chiefly quartz, feldspar, and mica

Weathered copper-bearing sulfide rock (likely bornite/chalcopyrite)

Bornite (Cu5FeS4) and/or chalcopyrite (CuFeS2), with oxidation tarnish

Possible ironstone or iron-oxide-rich mineral fragment

Unidentified iron oxide/hydroxide, possibly goethite or limonite

Tumbled jasper or chert

Microcrystalline quartz (SiO₂), likely jasper/chert

Blue Agate (Dyed)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Blue Agate (Tumbled and Dyed)

Silicon Dioxide (SiO2) with likely organic dyes

Iron-rich sulfide-bearing metamorphic rock

Likely pyrite- and/or chalcopyrite-bearing schist; identification is uncertain from imagery alone

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Smoky quartz vein fragment

Quartz, SiO₂ (likely smoky quartz)

White quartz cluster

Quartz (silicon dioxide, SiO₂), likely a drusy or microcrystalline cluster