Anthropic Metallic Specimen

Likely iron-rich meteorite or weathered sulfide-bearing rock

Unconfirmed; possible ordinary chondrite (stony meteorite) or iron-oxide/sulfide-bearing terrestrial rock

Likely weathered iron-rich meteorite

Unclassified stony-iron or iron meteorite candidate; confirmation requires laboratory testing

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite (on Quartz matrix)

Iron Sulfide (FeS2)

Iron Meteorite

Siderite (Iron-Nickel alloy)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Magnetite (Lodestone)

Magnetite (Fe3O4)

Pyrite

Iron Disulfide (FeS2)

Likely mica-rich schist with embedded dark pebble

Biotite–quartz schist; dark clast possibly basalt or chert

Iron-rich meteorite candidate

Undetermined meteoritic iron–nickel material; possibly an ordinary chondrite or weathered iron meteorite

Labradorite

Labradorite (Plagioclase Feldspar Series) - (Ca, Na)(Al, Si)4O8

Bismuth Crystal

Bismuth (Bi)

Collection of Minerals and Ores

Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)

Basalt (tumbled/river-worn)

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Likely hematite-rich iron ore

Hematite, Fe₂O₃, possibly mixed with magnetite or other iron oxides

Unidentified dark mineral/rock fragment

Indeterminate; appearance may fit a sulfide-bearing rock or iron-rich mineral

Likely pyrite-bearing rock or pyrite fragment

Pyrite (FeS₂), possibly mixed with quartz or carbonate matrix

Manhattan Schist

Manhattan Schist (Aluminous Metasedimentary Rock)

Quartzite Pebbler

Quartzite (SiO2)

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly with hematite and silicate matrix

Diorite (River Pebble)

Intermediate Phaneritic Igneous Rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Serpentinite (likely)

Serpentinite, dominated by serpentine-group minerals (antigorite, lizardite, chrysotile), commonly with magnetite and relic olivine/pyroxene

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Granite (with Muscovite Mica)

Phaneritic Felsic Igneous Rock (primarily Quartz SiO2, K-Feldspar KAlSi3O8, and Muscovite KAl2(AlSi3O10)(OH)2)

Oolitic Ironstone

Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)

Likely basaltic rock fragment

Fine-grained mafic igneous rock, probably basalt (plagioclase–pyroxene ± olivine)

Pyrite

Iron Sulfide (FeS2)

Pyrite cluster (iron pyrite)

Pyrite, FeS₂

Limonite / Goethite (Iron Ore Mineral nodule)

FeO(OH)·nH2O / FeO(OH)

Pyrite-bearing rock (likely pyrite-rich schist or sulfide ore)

Pyrite, FeS₂, dispersed in a dark metamorphic or hydrothermal host rock

Weathered mica schist (tentative)

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with marcasite or other sulfides

Polished hematite bead (probable)

Hematite, Fe₂O₃

Schorl (Black Tourmaline) in Pegmatite

Sodium Iron Aluminum Borosilicate (NaFe3Al6(BO3)3Si6O18(OH)4)

Basalt Riverstone

Basalt (Aphanitic Mafic Volcanic Rock)

Basalt River Stone

Basalt

Likely schist, possibly serpentinite

Mica schist; potential chlorite–serpentine-rich metamorphic rock

Basalt (River Pebble)

Extrusive mafic igneous rock

Basalt (Beach Pebble)

Extrusive Mafic Igneous Rock