Man Made Object (Coin)

Diamond

Carbon (C)

Orange Calcite (with White Calcite/Quartz matrix)

Calcium Carbonate (CaCO3)

Possible iron meteorite fragment

Iron meteorite, likely kamacite–taenite alloy

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Diamond (in a jewelry setting)

Carbon (C)

Gold

Native Gold (Au)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Blue Calcite (commonly sold as Caribbean Calcite)

Calcium Carbonate (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Limestone (Carved Statue)

Calcium Carbonate (CaCO3)

Barite Rose

Barium Sulfate (BaSO4)

Blue Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Orange Calcite (Mexican Onyx)

Calcium Carbonate (CaCO3)

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Weathered limestone pavement with a small fossil-like inclusion

Limestone, chiefly calcite (CaCO₃); the visible tan fragment cannot be identified confidently as a fossil from the image

Tumbled quartz pebble, likely iron-stained quartz

Quartz (silicon dioxide, SiO₂), possibly milky quartz with limonite/goethite staining

Likely faceted colorless gemstone

Probable quartz (rock crystal), SiO₂; diamond or topaz cannot be excluded from the photograph

White chalcedony cabochon ring

Chalcedony (microcrystalline quartz, SiO₂), likely white quartz variety

Pearl

Calcium Carbonate (Aragonite/Calcite) with Conchiolin, CaCO3

Carved stone bowl or mortar

Uncertain; likely steatite (soapstone) or fine-grained volcanic stone

Likely fossilized shell or carbonate concretion

Indeterminate biogenic calcium carbonate, commonly calcite (CaCO₃)

Chalk

Micrite (primarily Calcium Carbonate, CaCO3)

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various metal oxide impurities

Quartz pebble in concrete

Quartz (SiO₂), embedded in Portland-cement concrete

Polished dendritic agate or jasper pebble

Microcrystalline quartz (chalcedony), SiO₂, with dark manganese-oxide inclusions

Diamond (in Jewelry Setting)

Carbon (C)

Tumbled/cut citrine quartz point

Quartz, silicon dioxide (SiO₂), likely heat-treated amethyst sold as citrine

Blue-green opal, likely polished common or synthetic opal

Opal (hydrated amorphous silica, SiO₂·nH₂O); identification from the image is uncertain

Asphalt Pavement (with aggregate)

Asphalt concrete

Blue Slag Glass

Amorphous Silica (Byproduct of smelting)

Cardstock (Paper)

Cellulose (C6H10O5)n

Blue Goldstone

Aventurine Glass (SiO2 with Cobalt/Copper inclusions)

Synthetic Resin (Artificial Specimen)

Polyurethane or Polyester Resin

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Slag (Anthropogenic Glass/Iron byproduct)

Ferro-silicate Slag

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Calcite

Calcite (calcium carbonate, CaCO₃), likely massive or crystalline limestone-derived material