Mineral Based Composite

Small marine shell fragment

Calcareous shell, primarily calcium carbonate (aragonite or calcite); exact taxon indeterminate

Man-made Synthetic Material (Plastic/Composite)

Acrylonitrile Butadiene Styrene (ABS) or High-Impact Polystyrene (HIPS)

Gold Ore / Native Gold

Native Gold (Au)

Gold

Native Gold (Au)

Gold

Gold (Au)

Pyrite

Iron Pyrite (FeS2)

Banded Slate or Siltstone with Quartz/Calcite Veins

Protolith-derived Siltstone or Slate (varies based on degree of metamorphism)

Bauxite

Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)

Sandstone concretion (Ironstone-stained)

Arenite with Limonite/Hematite staining (Silica-based with Iron Oxides)

Dalmatian jasper

Orbicular rhyolite, commonly marketed as Dalmatian jasper; quartz–feldspar volcanic rock with dark aegirine/arfvedsonite-like inclusions

Polished green serpentine

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄

Conglomerate

Polymictic Conglomerate

Stream-worn greenstone (likely serpentinite or altered basalt)

Serpentinite, chiefly serpentine-group minerals; possibly chlorite–actinolite greenstone

Bloodstone (also known as Heliotrope)

Silicon Dioxide (SiO2) - variety of Chalcedony

Granite

Phaneritic Granitoid

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Aquamarine

Beryl (Be3Al2(SiO3)6)

Gold Nugget

Native Gold (Au)

Gold Nugget / Flake

Native Gold (Au)

Tumbled opalite (likely synthetic glass)

Opalite; typically man-made opalescent soda-lime glass, not a recognized mineral species

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Amber

Succinite (Carbon-based organic compound; approximate formula C10H16O)

Blue opalite (often sold as synthetic opal)

Opalite glass; amorphous hydrated silica if natural opal (SiO₂·nH₂O)

Blue Dyed Agate Geode Slice

Chalcedony (Silicon Dioxide, SiO2) with artificial cobalt/iron-based dye

Clear quartz sphere or polished quartz cabochon (tentative)

Quartz, silicon dioxide (SiO₂); appearance may also be consistent with ordinary glass, which cannot be ruled out from the image alone

Limonite Stained Basalt

Hydrated Iron Oxide on Mafic Volcanic Rock (FeO(OH)·nH2O)

Diamond

Native Carbon (C)

Gold Nugget

Native Gold (Au)

Marble

Metamorphosed Limestone

Sandstone

Sandstone (composed primarily of sand-sized minerals or rock grains)

Desert Varnish on Sandstone

Quartz Arenite with Iron-Manganese Oxide Coating

Tree Agate

Silicon dioxide (SiO2)

Asphalt

Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)

Small weathered pebble, possibly limestone

Indeterminate carbonate-rich rock; likely calcite-bearing limestone

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Native gold nuggets (likely gold-bearing specimen)

Native gold, Au; possibly associated quartz or sulfide matrix

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Native Gold (in earring form)

Gold (Au)

Gold

Native Gold (Au)

Faceted diamond

Diamond; crystalline carbon (C)

Raw amber

Amber (fossilized plant resin; commonly succinite, C10H16O)