Anthropic Metallic Specimen

Quartz with Mica inclusions (Gold-colored Mica)

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (Phlogopite/Muscovite) inclusions

Copper Nugget

Native Copper (Cu)

Weathered sulfide-bearing metamorphic rock (probable pyrite schist)

Quartz–mica schist with iron sulfides, chiefly pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Gold-bearing quartz or iron-stained sulfide specimen

Native gold (Au), possibly in quartz with limonite/goethite and sulfide remnants

Iron meteorite (probable)

Fe–Ni metallic meteorite, commonly kamacite–taenite

Tumbled Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Ferrochrome Slag

Industrial Glassy Slag (Fe-Cr alloy byproduct)

Mixed Mineral Assortment (Pyrite, Kyanite, Agate, Jasper)

FeS2 (Pyrite), Al2SiO5 (Kyanite), SiO2 (Agate/Jasper)

Hematite bead bracelet

Hematite (Fe₂O₃), likely polished or magnetically enhanced beads

Polished black obsidian

Volcanic glass; primarily silica-rich rhyolitic composition (approximately 70–80% SiO₂)

Likely metallic mineral specimen

Probably galena (lead sulfide, PbS), though visual identification is uncertain

Native copper nugget

Copper (Cu), commonly with cuprite and copper-oxide alteration

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Nugget of Native Silver

Native Silver (Ag)

Pyrite in Matrix

Iron Disulfide (FeS2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Peacock Ore (Bornite or Chalcopyrite)

Bornite (Cu5FeS4) or Acid-Washed Chalcopyrite (CuFeS2)

Native Gold

Native Gold (Au)

Iron-oxide-bearing rock fragment

Likely limonite/goethite with quartz or host-rock inclusions; exact identification requires testing

Barite Rose on Marcasite

Barium Sulfate (BaSO4) on Iron Sulfide (FeS2)

Pyrite in Matrix (likely Quartz or Schist matrix)

Iron Sulfide (FeS2)

Basalt

Basalt (Mafic volcanic rock)

Pyrite in Matrix (often with Chalcopyrite)

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

Pyrite-rich Ore

Pyrite (FeS2) with secondary minerals

Pyrite

Iron Sulfide (FeS2)

Gold Nugget Cluster

Native Gold (Au)

Gold-bearing Quartz / Auriferous River Rock

Lode Gold in Quartz Matrix (SiO2 + Au)

Dark polished stone, likely basalt or slag-like volcanic rock

Probable fine-grained basalt; exact identification requires testing

Tiger Diamond / Hematite-infused Quartzite

Silicified Hematite-Rich Quartzite (SiO2 + Fe2O3)

Gold Nugget

Native Gold (Au)

Metallic iron meteorite fragment (probable)

Iron meteorite, mainly kamacite (α-Fe–Ni), possibly with taenite

Iron-rich vesicular rock, possibly slag or weathered basalt

Identification uncertain; likely ferruginous basalt/ironstone, with possible anthropogenic iron slag

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Tiger Iron

Tiger Iron (Composition: SiO2, Fe2O3, Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Polished metallic sulfide-bearing pebble

Likely pyrite-bearing slate, schist, or sulfide-rich ore; exact identification requires testing

Pyrite-rich sulfide ore (likely pyrite with chalcopyrite)

Pyrite, FeS₂; possible chalcopyrite, CuFeS₂, and minor quartz or sphalerite

Pyrite

Iron Sulfide (FeS2)

Native metal specimen, likely galena or metallic slag

Probably galena (lead sulfide, PbS); identification is uncertain from the image alone

Obsidian (likely snowflake-free black variety)

Volcanic glass; primarily SiO₂-rich rhyolitic composition

Sunstone

Oligoclase (Plagioclase Feldspar), (Na,Ca)(Si,Al)4O8