Anthropic Metallic Specimen

Tumbled hematite-rich jasper

Jasper (microcrystalline quartz, SiO₂) with iron oxides, chiefly hematite (Fe₂O₃)

Fluorite

Calcium Fluoride (CaF2)

Pyrite

Iron Disulfide (FeS2)

Basalt

Mafic volcanic rock (Basalt)

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Weathered quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide and dark-mineral inclusions

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Arsenopyrite in Quartz Matrix

Arsenopyrite (FeAsS) with Quartz (SiO2)

Schist

Mica Schist

Pyrite Geode

Iron Disulfide (FeS2)

Uncertain dark metallic mineral specimen, possibly specular hematite or magnetite

Likely hematite (Fe₂O₃) or magnetite (Fe₃O₄); image alone is insufficient for firm identification

Chalcopyrite on Quartz

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Limonite Geode / Ironstone Concretion

Hydrated iron oxide-hydroxide (FeO(OH)·n H2O)

Quartz with Mica (Muscovite or Biotite)

Silicon Dioxide (SiO2) with Phyllosilicates

Sunstone

Oligoclase (Feldspar variety)

Pyrite-bearing rock (likely pyrite in a quartz or sulfide-rich matrix)

Pyrite, FeS₂; the gray host may be quartz, carbonate, or another sulfide-bearing rock

Sunstone

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

Limonite / Goethite (Ironstone)

Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O

Quartz with Pyrite inclusions

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Copper-bearing sulfide ore, likely chalcopyrite with iron oxides

Chalcopyrite (CuFeS₂), possibly associated with bornite (Cu₅FeS₄), pyrite, and limonite/goethite

Chalcopyrite

CuFeS2 (Copper Iron Sulfide)

Jasper with Pyrite (Gold-colored inclusions)

Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions

Iron meteorite fragment (likely meteorite slice)

Fe–Ni metallic meteorite, possibly an octahedrite; exact classification requires laboratory analysis

Gold Flakes in Oil (Novelty Specimen)

Native Gold (Au)

Schist (specifically Mica Schist)

Mica Schist (primarily composed of Muscovite KAl2(AlSi3O10)(OH)2 and Biotite)

Green Aventurine

Silicon Dioxide (Quartz) with inclusions of Fuchsite (K(Al,Cr)2AlSi3O10(OH)2)

Pyrite in Limestone

Iron Sulfide (FeS2) in Calcium Carbonate (CaCO3)

Quartz with inclusions

SiO2

Probable magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a fine-grained host rock

Likely weathered metallic mineral or slag fragment

Indeterminate; possibly iron-rich sulfide/oxide material or industrial slag

Purple fluorite cluster

Fluorite (calcium fluoride, CaF₂)

Iron sulfide-rich ore, possibly pyrite-bearing gossan

Likely pyrite (FeS₂) with iron oxides/hydroxides and host rock; exact identification requires testing

Sunstone

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

Pyrite in Matrix (Quartz/Schist)

Iron Sulfide (FeS2)

Gold Ore in Matrix

Native Gold (Au) in Quartz/Host Rock

Schist (Micaceous Schist)

Mica Schist

Basalt (with possible weathering)

Basalt

Metallic sulfide ore fragment, possibly pyrite-bearing rock

Indeterminate; likely pyrite (FeS₂) in a sulfide-rich matrix

Raw Sunstone

Sunstone (Feldspar variety, (Ca,Na)((Al,Si)2Si2O8))

Peacock ore (iridescent chalcopyrite, possibly bornite)

Chalcopyrite, CuFeS₂; the iridescent surface may be natural tarnish or artificial acid treatment. Similar material is bornite, Cu₅FeS₄.

Peacock Ore (Treated Chalcopyrite)

Copper Iron Sulfide (CuFeS2) coated with oxides

Basalt Beach Pebble

Basalt (Aphanitic Mafic Igneous Rock)