Not A Natural Rock (Man Made Composite)

Sea Glass

Man-made vitreous material / Silicon dioxide

Sandstone Concretion

Clastic sedimentary rock (primarily Quartz SiO2)

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Possible iron-rich basalt or industrial slag

Basalt, likely Fe–Mg silicate rock; exact identification is uncertain from the blurred image

Metal Chain (Likely Steel or a Steel Alloy)

Steel (primarily iron and carbon); specific alloy unknown

Titanium-coated Metal Cube (Man-made Fidget Toy)

Titanium-anodized or electroplated alloy (e.g., Ti-coated Zinc or Aluminum)

Clear quartz fragment (rock crystal)

Quartz, silicon dioxide (SiO₂)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Black beaded bracelet, likely black onyx or glass

Possibly chalcedony (microcrystalline quartz, SiO₂); the beads may instead be man-made glass

Beaded gemstone bracelet

Indeterminate; likely small polished mineral beads, possibly turquoise or dyed stone, with metal and glass components

Possible weathered basalt or slag fragment

Basalt, chiefly plagioclase and pyroxene; identification is uncertain from the image

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Turquoise ring

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O; the setting appears to be silver-colored metal

Diamond Druzy (Crystalline Diamond)

Carbon (C)

Carved greenstone figure

Likely nephrite jade (jadeite is a possible alternative), mainly amphibole-group minerals

Polished turquoise (likely stabilized)

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Diamond

Native Carbon (C)

Diamond (or Simulant)

Carbon (C) or Cubic Zirconia (ZrO2)

Blue glassy mineral specimen, possibly dyed or synthetic

Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass

Asphalt (Aggregate)

Bituminous macadam / Concrete Aggregate

Blue quartzite or blue aventurine glass-like aggregate

Quartzite, predominantly SiO₂ (identification uncertain from image)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Aluminum Slag

Anthropogenic Aluminum (Al)

Green Glass Slag

Amorphous Silicon Dioxide (SiO2) with metal oxide impurities

Stone Mosaic Mask

Composite silicate and carbonate minerals

Likely iron-rich slag or weathered ironstone

Hematite–goethite-rich material (Fe₂O₃/FeO(OH)); possibly industrial iron slag

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Turquoise butterfly carving

Turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O (carved; possibly stabilized or dyed)

Red glassy cabochon, likely synthetic ruby or red glass

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

Carved Stone Turtle

Carved Soapstone and Quartz

Green sea glass (likely)

Anthropogenic glass, not a mineral; composition commonly soda–lime silicate glass

Orange glassy slag (industrial by-product)

Iron-rich silicate glass; composition varies, commonly Fe–Ca–Al silicate

Natural Pearl

Calcium carbonate (primarily Aragonite and Conchiolin), CaCO3

Concrete-like aggregate surface with embedded rock fragments

Anthropogenic concrete or exposed aggregate; not a natural rock specimen

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Asphalt (Bituminous Concrete)

Asphaltum / Bitumen-Aggregate Matrix

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)