Mineraloid (Man Made Glass)

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

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

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Rainbow Hematite Ring

Iron(III) oxide (Fe2O3) with thin-film coating

Polymer Clay (Mock Mineral)

Polyvinyl chloride (PVC) with plasticizers and pigment

Concrete with Aggregate

Artificial Conglomerate (Cement and Aggregate)

Polished black stone, likely obsidian

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

Concrete / Anthropogenic Conglomerate

Man-made composite material (Portland cement, aggregate, and water)

Polished black pebble, possibly obsidian

Volcanic glass (obsidian), likely; identification is tentative from the image

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

White pebble, likely quartz or calcite

Indeterminate from image; possible microcrystalline quartz (SiO₂) or calcite (CaCO₃)

Cubic Zirconia (Jewelry Setting)

Zirconium Dioxide (ZrO2)

Diamond

Native Carbon (C)

Conglomerate

Conglomerate (clastic sedimentary rock)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Concrete / Conglomerate (Man-made)

Artificial Conglomerate (Cementitious Composite)

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Cubic Zirconia (Jewelry Setting)

Cubic Zirconia (ZrO2)

Aluminum Slag

Anthropogenic Aluminum (Al)

Dzi Bead (Etched Chalcedony)

Cryptocrystalline Quartz (SiO2) with chemical etching

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Green sea glass (likely slag glass or bottle glass)

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

Concrete rubble

Anthropogenic conglomerate

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)

Lava Rock with Fabric Impression

Scoria or Basalt with anthropogenic impressions

Libyan Desert Glass

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

Blue sea glass or blue glassy mineral fragment

Uncertain; likely man-made soda-lime glass, not a natural mineral

Ferro-slag (Leland Blue/Slag Glass)

Anthropogenic Vitreous Silica (Industrial Slag)

Goldstone (likely red/brown aventurine glass)

Man-made aventurine glass; copper-bearing silicate glass (not a natural mineral)

Titanium Aura Quartz

Silicon Dioxide (SiO2) coated with Titanium and Niobium

Concretion with Geode Cavity

Ferruginous Sandstone Concretion with Quartz Center

Concrete fragment or Conglomerate

Artificial Conglomerate (Concrete) or Natural Conglomerate

Likely clear quartz crystal or glass-like gemstone

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

Slag

Anthropogenic Vitreous Silica/Iron oxides

Dalmatian Stone

Dalmatian Jasper (a misnomer for an Aplite with Arfvedsonite spots)

Blue glassy fragment among beach gravel

Likely cobalt-blue man-made glass; not a natural mineral specimen

Polished gemstone tower assortment

Primarily quartz varieties and simulants; apparent amethyst (SiO₂), rose quartz (SiO₂), clear quartz (SiO₂), fluorite (CaF₂), sodalite, malachite, and possibly dyed or composite stones

Aura Quartz

Silicon Dioxide (SiO2) with metallic vapor coating

Red-orange cabochon, likely carnelian or glass imitation

Carnelian: chalcedony (microcrystalline SiO₂), commonly iron-colored