Man Made Material, Not A Natural Rock Or Mineral Specimen

Tumbled milky quartz pebble

Quartz (silicon dioxide, SiO₂), likely milky quartz

Likely clear quartz crystal or glass-like gemstone

Quartz, silicon dioxide (SiO₂); exact identification is uncertain from the strongly magenta-lit image

Opalite

Synthetic Glass (Simulated Opal)

Goldstone

Avventurina (Man-made Glass with Copper inclusions)

Opalite

Synthetic Silicon Dioxide (SiO2)

Mystic Topaz

Aluminum Silicate Fluoride Hydroxide (Al2SiO4(F,OH)2) with metallic film coating

Black tumbled stone, possibly obsidian

Obsidian (volcanic glass; predominantly SiO₂), identification uncertain from image

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Aura Quartz (Titanium/Gold coated)

Silicon Dioxide (SiO2) with metallic vapor deposition

Opalite

Synthetic glass / Opaque silicious glass

Small rounded mineral pebble, possibly quartz

Uncertain; likely microcrystalline or crystalline SiO₂ (quartz), potentially with iron-oxide staining

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Obsidian

Volcanic Glass

Titanium-Coated Hematite (Aura Hematite)

Titanium-bonded Hematite (Fe2O3 with a Ti coating)

Red/orange coral beads (likely dyed or treated coral)

Corallium spp.; calcium carbonate, mainly calcite (CaCO₃)

Opalite

Synthetic Opalized Glass (SiO2 + additives)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Blue Goldstone

Goldstone (artificial glass)

Diamond (or Cubic Zirconia)

Carbon (C) or Zirconium Dioxide (ZrO2)

Polished black stone, likely black obsidian

Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

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

Polished black stone, likely obsidian

Obsidian (volcanic glass; mostly silica-rich rhyolitic composition)

Concrete Fragment

Artificial Conglomerate (Cement and Aggregate)

Gold coin pendant on a chain

Gold (Au), likely a coin set in a gold-colored metal mount

Unidentified gray metallic object

Not determinable from the image; likely a metal screw or manufactured fastener rather than geological material

Opalite

Synthetic Opalised Glass

Concrete rubble

Anthropogenic conglomerate

Ironstone Concretion (Pot Stone)

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Chert Concretion

Chert (Microcrystalline Quartz, SiO2)

Pyrite in Quartz (Drill Core)

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2) inclusions

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

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

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Man-made Crystal (Lead Glass)

Lead oxide-doped Silica Glass (approx. SiO2 + PbO)

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

Aura Quartz Geodes (Lab-Altered)

Silicon Dioxide (SiO2) with Metallic Vapor Deposition

Opalite (Man-made Glass)

Synthetic Opalised Glass

Polished milky quartz (likely quartz worry stone or wand)

Quartz, silicon dioxide (SiO₂)

Small rounded pebble (rock type indeterminate)

Unidentified fine-grained lithic pebble

Obsidian

Volcanic Glass

Obsidian

Volcanic glass

Possible weathered basalt or slag fragment

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