Anthropic Metallic Specimen

Likely gold-colored metal ring with a possible gemstone

Uncertain; possibly gold alloy (Au) with a small quartz or glass-like setting

Copper

Native Copper (Cu)

Iron-rich rock or weathered metallic mineral specimen

Uncertain; possibly limonite/goethite with iron oxides, or a metallic sulfide such as pyrite/chalcopyrite

Hematite (iron oxide)

Hematite, α-Fe₂O₃

Pyrite

Iron Sulfide (FeS2)

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Lapis Lazuli

Lapis Lazuli (Primary mineral: Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Coal (Anthracite)

Anthracite (Carbon-based organic sedimentary/metamorphic rock)

Schorl (Black Tourmaline) in Quartz and Feldspar

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Mica Schist

Muscovite Schist (KAl2(AlSi3O10)(OH)2)

Likely hematite-rich ironstone fragment

Hematite (α-Fe₂O₃), possibly with other iron oxides

Crackle-pattern pyrite cube

Pyrite (iron disulfide, FeS₂), likely a cubic crystal with surface oxidation/fracturing

Copper-bearing rock, likely bornite/chalcopyrite in iron-rich matrix

Chalcopyrite (CuFeS₂) and/or bornite (Cu₅FeS₄) in limonite/goethite matrix

Basalt River Pebble

Aphanitic Mafic Volcanic Rock (Basalt)

Basalt

Extrusive igneous rock

Likely pyrite-bearing rock

Pyrite (FeS₂), possibly in a quartz- or sulfide-rich matrix

Native gold-bearing quartz/rock specimen

Native gold (Au) in quartz and iron-oxide matrix

Iron meteorite (likely an etched or weathered display specimen)

Iron meteorite, composed chiefly of kamacite and taenite (Fe–Ni alloys)

Iron-rich sulfide ore (likely pyrite-bearing rock)

Likely pyrite (FeS₂) with dark host rock; exact identification is uncertain from the image alone.

Unknown metallic sulfide-bearing rock, possibly chalcopyrite or bornite

Tentative: chalcopyrite (CuFeS₂) or bornite (Cu₅FeS₄)

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Basalt (Road Gravel)

Basalt (Mafic Extrusive Igneous Rock)

Tiger’s-eye-rich breccia or jasper

Quartz-rich silicified rock, likely containing iron oxides (SiO₂ with Fe oxides/hydroxides)

Silver Nugget

Native Silver (Ag)

Likely galena (lead sulfide)

Galena, PbS

Basalt Beach Pebble

Basalt (Aphanitic Mafic Volcanic Rock)

Pyrite

Iron Sulfide (FeS2)

Gold Nugget

Native Gold (Au)

Sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Quartz–mica rock with disseminated pyrite; pyrite is FeS₂

Likely weathered basalt with iron-oxide alteration

Basalt (fine-grained mafic volcanic rock), chiefly plagioclase and pyroxene with altered iron-bearing minerals

Pyrite and Chalcopyrite in Fluorite Matrix

Calcium Fluoride (CaF2) with Iron Sulfide (FeS2)

Mica-rich metamorphic rock, likely phyllite or mica schist

Quartz–muscovite phyllite/schist; commonly dominated by muscovite mica, quartz, and minor feldspar

Iron-stained quartz-rich rock, possibly weathered granite or quartzite

Indeterminate quartz–feldspar aggregate with iron-oxide staining; likely granitic or hydrothermal material

Mica Schist

Mica-rich Schist containing Muscovite and Quartz

Possible iron-rich meteorite fragment

Undetermined; possible stony-iron or iron-oxide-rich meteorite

Basalt

Aphanitic Mafic Igneous Rock

Basalt

Aphanitic Mafic Igneous Rock

Pyrite (iron pyrite)

Pyrite, FeS₂; cubic iron sulfide

Gold Nugget

Native Gold (Au)

Basalt River Pebble

Basalt

Basalt River Pebble

Basalt