Mineral (Processed Alloy)

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Blue slag glass / industrial smelter slag

Man-made iron-rich silicate slag; composition variable, commonly Fe–Ca–Mg–Al silicates with glassy phases

Copper

Native Copper (Cu)

Silicon

Silicon (Si)

Diamond bracelet (gold-set)

Diamond, crystalline carbon (C); gold alloy setting

Metallic sulfide mineral specimen, likely pyrite

Pyrite (FeS₂), possibly a pyrite-rich sulfide aggregate

Native Copper

Native Copper (Cu)

Red Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2) with iron oxide inclusions

Iron Meteorite

Iron-nickel alloy (primarily kamacite and taenite)

Galena (lead sulfide)

Galena, PbS

Polished native copper

Native copper (Cu), likely with cuprite/tenorite oxidation products

Copper-bearing sulfide ore, possibly chalcopyrite-rich

Chalcopyrite (CuFeS₂), possibly with bornite and oxidation products

Arsenic (Native)

Arsenic (As)

Silver (S925)

Native Silver (Ag)

Earthy iron-rich clay or weathered laterite

Hydrated iron oxides and clay minerals, commonly goethite/hematite with kaolinite or illite

Banded sandstone pebble

Lithic or quartz-rich sandstone; exact composition requires testing

Weathered iron-rich rock fragment

Likely limonite/goethite-rich ironstone; exact identification requires testing

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Polished sodalite pendant

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely with minor albite or nepheline

Tiger's Eye

Silicified Crocidolite Pseudomorph (SiO2 with iron oxides)

Copper-bearing rock (likely native copper in a green copper-mineral matrix)

Native copper (Cu), possibly with chrysocolla or malachite; exact identification requires testing

Arsenopyrite

Arsenopyrite (FeAsS)

Likely quartz-rich rock fragment

Quartz (SiO₂), possibly a fragment of quartzite or silica-rich slag

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

Arsenopyrite in Sulphide Ore

Arsenopyrite (FeAsS)

Granite

Phaneritic plutonic igneous rock (SiO2 range 65-75%)

Rough beryl, possibly green beryl or aquamarine

Beryl, Be₃Al₂Si₆O₁₈

Bismuth crystal

Bismuth (Bi), commonly laboratory-grown

Native copper nugget

Copper (Cu), native element

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Native copper nugget

Native copper (Cu)

Aquamarine (Pale variety)

Beryl (Be3Al2Si6O18)

Bismuth

Bismuth (element Bi) with oxidized thin-film interference layer

Silicon

Crystalline Silicon (Si)

Michigan Float Copper

Native Copper (Cu)

Gold Nugget

Native Gold (Au)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Galena (lead ore)

Galena, PbS (lead sulfide)