Anthropogenic Material (Man Made Rock)

Goldstone (Synthetic Aventurescence Glass)

Cuprous Aventurescent Glass (Silicon Dioxide with Copper inclusions)

Sandstone (Red/Brown Variety)

Arenite (composed primarily of SiO2 with Fe2O3 iron oxide inclusions)

Aventurine

Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)

Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)

Iron Slag

Anthropogenic Vitreous Silicate (Byproduct of Smelting)

Cubic Zirconia (Man-made)

Cubic Zirconia (ZrO2) with Enamel and Metal Alloy

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Basalt

Basalt

Coal (Anthracite / Bituminous)

Organic Sedimentary Rock (Carbon-based)

Unakite

Altered Granite (Epidotized Granite)

Blue Apatite

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

Chert (Arrowhead/Projectile Point)

Cryptocrystalline Quartz (SiO2)

Synthetic Marbled Aggregate (Footwear Component)

Ethylene-vinyl acetate (Croslite™)

Coral Rock (Coquina)

Biogenic Limestone (Calcium Carbonate - CaCO3)

Blue glass-like tumbled specimen

Most likely cobalt-blue slag glass or manufactured glass; not confidently identifiable as a natural mineral from the image

Likely weathered iron-rich rock or slag fragment

Uncertain; possibly limonite/goethite-rich material (FeO(OH)·nH₂O)

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Artificial Rock Face (Faux Rock)

Glass Fiber Reinforced Concrete (GFRC)

Chert (Chocolate or Brown Flint)

Chert (SiO2)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

White Marble

Recrystallized Calcite Rock (CaCO3)

Sandstone (Pebble)

Sandstone (arenite, arkose, wacke depending on composition)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Tumbled amber-colored chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Ferruginous Sandstone (Ironstone)

Clastic Sedimentary Rock (composed of SiO2 with Fe2O3/FeO(OH) cement)

Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic plutonic rock (SiO2 typically >69%)

Banded Calcite (often sold as 'Mexican Onyx' or 'Green Onyx')

Calcite (Calcium Carbonate, CaCO3)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

Sea Glass (Cobalt Blue)

Amorphous Silica (Glass with Cobalt additives)

Sandstone

Arenite (composed primarily of SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Dyed Crackle Quartz

Silicon Dioxide (SiO2) with synthetic dye

Dyed Dragon Vein Agate

Silicon Dioxide (SiO2) with artificial pigment

Sea Glass (Frosted Glass)

Amorphous Silica (SiO2) with various additives

Chert

Microcrystalline Quartz (SiO2)

Diorite

Intermediate plutonic igneous rock

Libyan Desert Glass

Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Sea Glass (Kelly Green)

Amorphous Silica (Silicon Dioxide with Iron/Chromium additives)

Tumbled greenstone (likely serpentinite or green jasper)

Serpentinite, commonly dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄); exact identification requires testing

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions