Man Made Material, Not A Natural Rock Or Mineral Specimen

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Gold (Elemental Metal)

Gold (Au)

Sandstone

Arenite (SiO2 based clastic rock)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Moissanite

Silicon Carbide (SiC)

Unidentified pale mineral or rock surface

Indeterminate from image; possibly a small quartz or feldspar grain

Pumice or vesicular volcanic tuff

Pumice: highly vesicular volcanic glass, chiefly rhyolitic to dacitic; possible tuff: lithified ash and pumice fragments

Crushed Stone (Likely Limestone or Granite)

Calcium Carbonate (CaCO3) for Limestone / Quartz and Feldspar for Granite

Aluminum Slag

Anthropogenic Aluminum (Al)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Green aventurine bead bracelet

Quartz (SiO₂), typically green quartzite/aventurine colored by fuchsite mica or other inclusions

Vesicular basalt (weathered scoria)

Scoriaceous basalt; chiefly plagioclase, clinopyroxene, olivine, and iron-titanium oxides

Diamond (in a jewelry setting)

Carbon (C)

Red glassy cabochon, likely synthetic ruby or red glass

Uncertain; possible synthetic corundum (Al₂O₃, chromium-colored) or man-made glass

Mother of Pearl (Nacre) / Shell Fragment

Biogenic Calcium Carbonate (Aragonite and Conchiolin)

Probable fossil-bearing rock or mineral concretion

Unidentified carbonate-rich concretion with a possible fossil inclusion

Ruby in Matrix

Corundum (Al2O3)

Diamond

Diamond (pure Carbon, C)

Sandstone

Arenite (specifically sublithic or quartz arenite)

Probable amber fragment

Amber (fossilized plant resin; chiefly amorphous organic resin, commonly dominated by succinite)

Decorated turquoise-like bead or mineral pendant

Likely turquoise [CuAl₆(PO₄)₄(OH)₈·4H₂O], possibly dyed composite or blue-green jasper

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Synthetic Faux Fur Fursuit

Polyacrylonitrile / Polyester (Synthetic Textile)

Rough Sapphire (Corundum)

Corundum (Al2O3)

Artisanal Glass Beads (Simulated Goldstone or Aventurine Glass)

Silicon Dioxide (SiO2) with metallic inclusions

Blue Chalcedony Cube

Silicon Dioxide (SiO2)

Polished green-and-black banded cabochon (likely malachite imitation or dyed agate)

Uncertain; possible malachite (Cu₂CO₃(OH)₂), banded agate (SiO₂), or man-made glass

Tumbled yellow jasper or chalcedony

Microcrystalline quartz, SiO₂; likely iron-oxide-bearing jasper/chalcedony

Conglomerate

Conglomerate Rock (Paraconglomerate)

White druzy quartz pendant with a blue crystal accent

Quartz (SiO₂); the blue material is not identifiable from the image

Seven Chakra Bonded Stone

Bonded composite of Red Jasper, Carnelian, Tiger's Eye, Aventurine, Lapis Lazuli, Amethyst, and Clear Quartz

Vesicular basalt (possibly slag-contaminated)

Basalt; chiefly plagioclase and pyroxene, with possible olivine and secondary minerals

Asphalt

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

Uncertain fine-grained rock or mineral-bearing specimen

Indeterminate; possible quartz- or feldspar-bearing matrix with reflective grains

Quartz pebble (Quartztite fragment)

Silicon Dioxide (SiO2)

Diamond

Carbon (C)

Botryoidal chalcedony (likely agate/jasper variety)

Microcrystalline quartz, SiO₂

Small greenish crystal/mineral fragment

Indeterminate; possibly olivine, quartz, or a green gemstone fragment