Mineraloid (Man Made Glass)

Concrete with Aggregate

Composite construction material; primary matrix is Calcium Silicate Hydrate (C-S-H)

Blue opal heart cabochon

Common opal, hydrated amorphous silica (SiO₂·nH₂O), likely blue-dyed or synthetic opalite

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Concrete

Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)

Agate and millefiori glass jewelry

Agate: microcrystalline quartz (SiO₂); millefiori element appears to be man-made glass

Quartz crystal (likely clear quartz)

Quartz, silicon dioxide (SiO₂)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), chiefly silica-rich rhyolitic composition

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

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

Cherry Quartz with Rose Quartz

Crystalline Quartz (SiO2) with glass-based synthetic components

Likely blue-green glassy slag or a weathered mineral fragment

Unidentified; the image does not show diagnostic features sufficient for a mineral identification

Asphalt Concrete (Bituminous Pavement)

Aggregates in Bitumen Matrix

Slag

Glassy silicate byproduct (anthropogenic material)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) with polymer resins

Aluminum Slag

Anthropogenic Aluminum (Al)

Blue sea glass or blue glassy mineral fragment

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

Green sea glass (likely slag glass or bottle glass)

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

Goldstone (likely red/brown aventurine glass)

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

Blue-green cabochon, likely chalcedony or treated glass imitation

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

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Fluorite (Polished Point/Tower)

Calcium Fluoride (CaF2)

Polished black pebble, possibly obsidian

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

Diamond / Clear Quartz / Glass paste

Carbon (Diamond) / Silicon Dioxide (Quartz)

Concrete fragment with Aggregate

Anthropogenic Concrete with Calcarious and Siliceous Aggregate

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Asphalt Concrete

Bituminous Concrete (Anthropic Rock)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)

Goldstone (Brown/Gold variety)

Aventurine Glass (SiO2 with Copper inclusions)

Iron-rich slag or ironstone; appearance is not diagnostic

Likely iron-oxide-rich material (hematite, Fe₂O₃, and/or magnetite, Fe₃O₄); possibly smelting 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)

Green glassy mineral fragment, possibly fluorite

Fluorite (calcium fluoride, CaF₂), tentative identification

Blue glassy fragment among beach gravel

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

Iron Slag (Industrial Byproduct)

Anthropogenic Vitrification Product/Ferrous Slag

Polished black stone, likely obsidian

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

Libyan Desert Glass

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

Ferrochrome Slag

Anthropogenic slag (Fe-Cr alloy waste)

Slag

Ferrous Slag (Amorphous calcium-magnesium-aluminum silicates)

Slag (Industrial Glass/Glassy Rock)

Anthropogenic Vitreous Material

Milky quartz (rough fragment)

Quartz, silicon dioxide (SiO₂)