Mineral Based Human Made Alloy

Gold Nugget

Native Gold (Au)

Gold Nugget

Native Gold (Au)

Silver (Jewelry Specimen)

Native Silver (Chemical Formula: Ag)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (often called Flint)

Microcrystalline Quartz (SiO2)

Coquina

Biogenic Limestone (Coquina)

Galena

Galena (lead sulfide, PbS)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Stilbite

Stilbite-Ca (NaCa4(Si27Al9)O72·28H2O)

Chert (Flint)

Silicon Dioxide (SiO2)

Diamond

Natural Carbon (C)

Native Gold (in the form of jewelry)

Gold (Au)

Gold Nugget

Native Gold (Au)

Turquoise

Hydrous phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Clear quartz crystal sphere

Quartz (silicon dioxide, SiO₂)

Tumbled smoky quartz

Quartz, silicon dioxide (SiO₂), smoky variety

Amethyst Geode

Amethyst (Silicon Dioxide), Formula: SiO2

Polished septarian nodule

Septarian concretion; calcite/aragonite and barite-filled fractures in a carbonate-rich mudstone, commonly with pyrite

Chert

Chert (Microcrystalline Quartz, SiO2)

Granite

Phaneritic plutonic rock (dominated by SiO2, Al2O3, K2O, Na2O)

Chert (Brown Variety)

Microcrystalline Quartz (SiO2)

Selenite (gypsum)

Gypsum, CaSO₄·2H₂O; variety commonly called satin spar or selenite

Sandstone

Quartz arenite / Lithic sandstone

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone (with Laminations)

Clastic sedimentary rock (primarily Quartz-based)

Tumbled green gemstone, likely dyed howlite or serpentine

Most consistent with dyed howlite (Ca2B5SiO9(OH)5); exact identification requires testing

Opalite

Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)

Aquamarine (Small Beads)

Beryl (Be3Al2Si6O18 with traces of iron)

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Citrine

Citrine (Silicon Dioxide - SiO2)

Likely metallic mineral specimen

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

Celestite (Celestine)

Strontium sulfate (SrSO4)

Chert (specifically Yellow/Common Opal or Jasper mixture)

Silicon Dioxide (SiO2)

Fossiliferous Limestone (Coquina)

Biogenic Limestone (Calcium Carbonate, CaCO3)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Opalite

Synthetic glass / Opaque silicious glass

Tumbled banded metamorphic stone

Likely banded gneiss or migmatitic gneiss; exact identification requires testing

Sodium Polyacrylate (Superabsorbent Polymer)

Sodium Polyacrylate [-CH2-CH(COONa)-]n

Pearl

Biogenic CaCO3 (Aragonite and Calcite)

Diamond

Diamond (pure Carbon, C)

Opalite

Synthetic Opalized Glass