Not A Rock (Man Made Polymer)

Slag Glass

Vitreous Silicate Residue

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Opalite

Synthetic Glass (Silica-based)

Costume Jewelry with Synthetic Gemstones

Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)

Asphalt Concrete

Bituminous Concrete

Opaline Glass (Opalite)

Synthetic Silicon Dioxide Glass

Titanium Aura Quartz

Titanium bonded Silicon Dioxide (SiO2 + Ti)

Blue Diamond

Carbon with Boron impurities (C)

Blue Goldstone

Auraventurine (Synthetic glass with cobalt and copper inclusions)

Chert Concretion (with typical hematite/limonite staining)

Sedimentary Concretion (SiO2 with FeO(OH)⋅nH2O)

Aura Quartz (Titanium Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti)

Concrete

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

Polished obsidian

Volcanic glass; predominantly rhyolitic SiO₂

Red Slag Glass

Amorphous Silica (Industrial byproduct with metallic oxide dopants)

Opalite

Synthetic Glass (Simulated Opal)

Opalite

Synthetic Glass (Simulated Opal)

Cullet Glass (Slag Glass)

Amorphous Silicon Dioxide (Industrial Byproduct)

Aura Quartz

Titanium or Gold bonded Silicon Dioxide (SiO2)

Opalite

Synthetic Glass (Amorphized Silicon Dioxide)

Dalmatian jasper

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

Blue Obsidian

Volcanic Glass (SiO2 with inclusions)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Blue Obsidian

Volcanic Glass (Silica, SiO2)

Aura Quartz (specifically Titanium Aura Quartz)

Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)

Metal Alloy (Likely Pewter or Sterling Silver)

Not a natural geological specimen; composed of refined metals. If pewter, it's a tin-based alloy. If sterling silver, it's 92.5% silver and 7.5% other metals (usually copper).

Blue Obsidian (Cullet Glass)

Silicon Dioxide (Amorphous Glass)

Likely blue-green glassy slag or a weathered mineral fragment

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

Asphalt Chunk

Asphalt concrete

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Opalite

Synthetic Opalized Glass

Opalite (Synthetic Moonstone/Opal)

Synthetic Silica Glass

Aluminum Slag

Anthropogenic Aluminum (Al)

Carved opalite pendant

Opalite (man-made opalescent glass; not a natural mineral)

Purple glassy pebble, possibly slag glass

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

Sea Glass (specifically Frosted White)

Amorphous Silica (substance: Sodium-calcium silicate glass)

Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)

Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)

Carborundum (Silicon Carbide)

Silicon Carbide (SiC) / Moissanite (natural form)

Quartz crystal fragment (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Goldstone (brown goldstone)

Man-made aventurine glass, typically copper-bearing silica glass

Titanium Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)

Chert (Chalky Flint Node)

Chert (Microcrystalline Quartz, SiO2)

Opalite Egg

Synthetic Glass (Simulated Opal)