Anthropic Metallic Specimen

Silver (Native Silver Mineral)

Ag (Native Silver), Alloyed 90% Ag / 10% Cu

Basalt (River-Worn Pebble)

Basalt

Quartz with Metallic Inclusion

Silicon Dioxide (SiO2) with associated metallic sulfide or oxide

Ferruginous Sandstone (Ironstone)

Sedimentary rock with high iron oxide content (Fe2O3 / FeO(OH))

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products

Iron Ore (Hematite/Goethite)

Ironstone (Fe2O3 / FeO(OH))

Sunstone (Oregon Sunstone)

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

Hematite

Iron(III) oxide (Fe2O3)

Native gold-bearing quartz/rock specimen

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

Healer's Gold (Pyrite/Magnetite in Serpentine)

Magnetite (Fe3O4) and Pyrite (FeS2) in Lizardite/Antigorite [Mg3Si2O5(OH)4]

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Graphite-rich schist (probable)

Graphite schist; primarily graphite (C) with mica and quartz

Raw graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly crystalline carbon (graphite, C) with mica and quartz

Pyrite-bearing metamorphic rock (probable schist or quartzite)

Quartz–mica schist with disseminated pyrite; approximate composition SiO₂ + phyllosilicates + FeS₂

Basalt (River Stone)

Extrusive mafic igneous rock

Weathered iron-rich mineral concretion

Likely limonite/goethite concretion (hydrated iron oxides), possibly a weathered ironstone fragment

Tumbled banded iron formation (jasper-rich ironstone)

Banded iron formation, commonly hematite/magnetite with microcrystalline quartz (SiO₂)

Likely galena-bearing ore

Galena (PbS), possibly mixed with quartz or carbonate gangue

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Quartz-bearing altered rock, possibly iron-stained quartz vein

Quartz (SiO₂) in a feldspathic/sericitized host, with iron-oxide staining

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Arsenopyrite in Quartz/Host Rock

Arsenopyrite (FeAsS)

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Basalt

Basalt (containing plagioclase feldspar, pyroxene, and olivine)

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Pyrite in Quartz

Iron Sulfide (FeS2) with Silicon Dioxide (SiO2)

Fuchsite (Green Muscovite / Mica Schist)

Chromian Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Possible iron-rich stone or meteorite fragment

Undetermined; possibly magnetite-bearing rock or an ordinary chondrite

Likely metallic meteorite fragment

Unclassified iron-rich meteorite; possible stony-iron or iron meteorite

Sunstone

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

Garnet Schist

Almandine-bearing Mica Schist

Iron-rich metamorphic rock, likely hematite-bearing schist or ironstone

Hematite/goethite-rich quartz–mica schist or banded ironstone; Fe₂O₃ and FeO(OH) are probable major iron minerals

Likely galena-bearing ore

Galena (lead sulfide, PbS), possibly mixed with quartz or other sulfides

Chalcopyrite

Copper iron sulfide (CuFeS2)

Mica Schist with Vein

Mica Schist

Labradorite

(Ca, Na)(Al, Si)4O8 (Calcium Sodium Aluminum Silicate)

Basalt (River Pebble)

Extrusive mafic igneous rock

Quartz with Arsenopyrite

Silicon Dioxide (SiO2) with Iron Arsenic Sulfide (FeAsS)

Peacock Ore

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

Pyrite

Iron Sulfide (FeS2)

Native Copper

Native Copper (Cu)

Pyrite

Iron Disulfide (FeS2)