Mineral (Processed Alloy)

Colorless quartz crystal (likely quartz fragment)

Quartz, silicon dioxide (SiO₂)

Gold in Quartz Matrix

Native Gold (Au) with Quartz (SiO2)

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)

Copper

Native Copper (Cu)

Silicon

Silicon (Si)

Tiger's Eye

Silicified Crocidolite Pseudomorph (SiO2 with iron oxides)

Arsenopyrite

Arsenopyrite (FeAsS)

Blue slag glass / industrial smelter slag

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

Red Granite

Phaneritic Felsic Intrusive Igneous Rock

Granite

Granite

Metallic sulfide mineral specimen, likely pyrite

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

Earthy iron-rich clay or weathered laterite

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

Arsenopyrite in Sulphide Ore

Arsenopyrite (FeAsS)

Weathered iron-rich rock fragment

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

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

Celestite (Celestine)

Strontium Sulfate (SrSO4)

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

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)

Iron Meteorite

Iron-nickel alloy (primarily kamacite and taenite)

Polished sodalite pendant

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

Granite

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

Gold Nugget

Native Gold (Au)

Raw aquamarine (likely beryl)

Beryl, Be₃Al₂Si₆O₁₈; blue color from iron impurities

Native copper-bearing rock

Native copper (Cu), likely with copper oxides/carbonates in a host rock

Native bismuth

Bismuth (Bi), commonly forming hopper crystals or aggregates

Native copper nugget

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

Dyed Howlite (simulating Lavender/Purple Jade or Charoite)

Howlite: Ca2B5SiO9(OH)5 (when natural)

Garnet-set butterfly brooch

Likely almandine or pyrope garnet, iron–aluminum silicate (Fe₃Al₂Si₃O₁₂ or Mg₃Al₂Si₃O₁₂)

Copper-Bearing Sulfide Ore (likely Chalcopyrite or Bornite)

Chalcopyrite (CuFeS2) or Bornite (Cu5FeS4) in host rock

Shale with Plant Fossils / Carbonaceous Shale

Laminated Mudrock (Siliciclastic)

Dyed or coated quartz geode

Quartz geode; silicon dioxide (SiO₂), likely artificially color-enhanced