Mineral Based Composite

Blue Aventurine

Silicon Dioxide (SiO2) with inclusions of Dumortierite

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Gold Ore / Native Gold

Native Gold (Au)

Gold

Native Gold (Au)

Gold

Gold (Au)

Polished green serpentine

Serpentinite, chiefly antigorite/lizardite Mg₃Si₂O₅(OH)₄

Stream-worn greenstone (likely serpentinite or altered basalt)

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

Mica Schist

Mica Schist (varies based on mineral makeup, often Biotite/Muscovite schist)

Asphalt

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

Granite

Phaneritic Granitoid

Aquamarine

Beryl (Be3Al2(SiO3)6)

Fluorite

Fluorite (Calcium Fluoride, CaF2)

Gold Nugget

Native Gold (Au)

Gold Nugget / Flake

Native Gold (Au)

Banded Slate or Siltstone with Quartz/Calcite Veins

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

Sandstone concretion (Ironstone-stained)

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

Blue opalite (often sold as synthetic opal)

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

Tumbled opalite (likely synthetic glass)

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

Basalt

Basalt

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

Turquenite (Dyed Howlite)

Dyed Ca2B5SiO9(OH)5 (Calcium Borosilicate Hydroxide)

Sandstone

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

Marble

Metamorphosed Limestone

Diamond

Native Carbon (C)

Gold Nugget

Native Gold (Au)

Desert Varnish on Sandstone

Quartz Arenite with Iron-Manganese Oxide Coating

Small weathered pebble, possibly limestone

Indeterminate carbonate-rich rock; likely calcite-bearing limestone

Amber

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

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)

Raw amber

Amber (fossilized plant resin; commonly succinite, C10H16O)

Blue Dyed Agate Geode Slice

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

Limonite Stained Basalt

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

Shale or Mudstone (Based on appearance)

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

Milky quartz

Quartz (silicon dioxide, SiO₂)

Gold Ore in Quartz/Matrix

Native Gold (Au) in Quartz (SiO2) matrix

Tree Agate

Silicon dioxide (SiO2)

Quartz-rich breccia or iron-stained quartz vein

Microcrystalline and crystalline quartz (SiO₂) with iron-oxide minerals, possibly limonite/goethite and sulfides

Quartz

Silicon Dioxide (SiO₂)

Inlaid stone ring (likely jasper or agate)

Likely microcrystalline quartz (chalcedony, SiO₂), possibly jasper, with decorative mineral inlays