Not A Rock (Man Made Industrial Metal)

Asphalt Concrete

Bituminous Concrete

Blue-green cabochon, likely chalcedony or treated glass imitation

Cryptocrystalline quartz (chalcedony/possibly chrysoprase); identification uncertain from image

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Blue Goldstone

Aventurine Glass

Purple glassy pebble, possibly slag glass

Unidentified; likely man-made glass rather than a natural mineral

Dalmatian jasper

Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar

Green Obsidian Sphere (man-made glass)

Vitreous Silica with Chromium/Iron additives

Opalite

Synthetic glass / Opalized glass

Black beaded bracelet, likely black onyx or glass

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

Engineerged Quartz (Quartz Composite)

SiO2 (Silicon Dioxide) in a polymer resin matrix

Acrylic or Resin (Synthetic Imitation)

Polymethyl Methacrylate (PMMA) or Polyepoxide

Clear-stone silver-tone teardrop earring

The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.

Concrete

Anthropogenic Conglomerate

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Clear quartz tumbled stone

Quartz (silicon dioxide, SiO₂)

Concrete Fragment

Hardened Portland cement and mineral aggregate

Faceted brown gemstone pendant, likely smoky quartz or champagne topaz

Probably quartz (SiO₂), smoky variety; alternatively topaz (Al₂SiO₄(F,OH)₂)

Opalite

Synthetic Opalised Glass

Asphalt Concrete (Bituminous Conglomerate)

Anthropogenic Bituminous Conglomerate

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Aggregate Concrete

Anthropogenic Conglomerate (Technosol)

Clear Quartz Sphere (Rock Crystal)

Silicon Dioxide (SiO2)

Opalite

Man-made glass (traditionally simulated Opal)

Opalite-style pendant (likely synthetic glass, not natural opal)

Opalescent glass; commonly sold as “opalite” (not a recognized mineral species)

Terrazzo (Man-made Composite)

Cementitious or Resin-bound Lithic Composite

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Native Silver

Silver (elemental Ag)

Beaded gemstone bracelet

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

Goldstone (blue/black aventurine glass)

Man-made aventurine glass; silica glass containing metallic copper or other glittering inclusions

Concrete Rubble with Aggregate

Hardened Portland Cement Paste with Coarse Aggregate

Gold ring with a dark, possibly gemstone setting

Gold alloy; the dark setting is not identifiable from the image

Asphalt Concrete (Bituminous Concrete)

Bituminous aggregate

Asphalt (Road Aggregate)

Asphalt concrete / Bituminous mixture

Titanium Amethyst Geode

Silicon Dioxide (SiO2) with Titanium/Metal Vapor Deposition Layer

Blue glassy gemstone-like specimen

Indeterminate; possibly dyed or treated turquoise, blue apatite, or man-made glass

Polished blue glassy mineral specimen, likely sodalite or blue aventurine

Most consistent with sodalite (Na₈Al₆Si₆O₂₄Cl₂), though dyed quartzite or blue glass cannot be excluded from the photograph

Blue Goldstone

Man-made glass with suspended copper, cobalt, or manganese particles

Concretion (Sandstone)

Carbonate-cemented Sandstone Concretion

Green sea glass (likely slag glass or bottle glass)

Man-made soda-lime silicate glass; not a naturally occurring mineral

Man-made Glass (Tumbled/Shaped)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Diamond

Native Carbon (C)