Opalite
Synthetic Glass (Silica-based)
gemstone
Category
Not A Rock (Man Made Polymer)
Browse not a rock (man made polymer) specimens identified by the Rock Identifier community.
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Costume Jewelry with Synthetic Gemstones
Synthetic Cubic Zirconia and Glass (SiO2 / ZrO2)
mineral
Asphalt Concrete
Bituminous Concrete
sedimentary (artificial)
Opaline Glass (Opalite)
Synthetic Silicon Dioxide Glass
Mineraloid (Man-made)
Titanium Aura Quartz
Titanium bonded Silicon Dioxide (SiO2 + Ti)
mineral
Green sea glass (likely bottle glass)
Man-made soda-lime silicate glass; not a natural mineral
mineral
Green sea glass (likely bottle glass)
Man-made soda–lime silicate glass; not a natural mineral
mineral
Aura Quartz (Titanium Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti)
mineral
Clear quartz fragment (rock crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Red Slag Glass
Amorphous Silica (Industrial byproduct with metallic oxide dopants)
Mineraloid / Industrial Byproduct
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Blue Goldstone
Auraventurine (Synthetic glass with cobalt and copper inclusions)
Synthetic (Man-made Glass)
Polished obsidian
Volcanic glass; predominantly rhyolitic SiO₂
igneous
Blue Obsidian (Cullet Glass)
Silicon Dioxide (Amorphous Glass)
mineral
Blue Obsidian
Volcanic Glass (SiO2 with inclusions)
igneous
Green glass sphere/marble
Soda-lime glass (primarily SiO2, Na2O, CaO)
Man-made object (Simulant)
Opalite
Synthetic Glass (Amorphized Silicon Dioxide)
mineraloid
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).
Man-made material (metal)
Opalite
Synthetic Glass (Simulated Opal)
gemstone
Opalite
Synthetic Glass (Simulated Opal)
gemstone
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial Byproduct)
mineraloid
Aura Quartz
Titanium or Gold bonded Silicon Dioxide (SiO2)
mineral
Dalmatian jasper
Porphyritic microcrystalline quartz-rich rock, commonly sold as Dalmatian jasper; spots are chiefly arfvedsonite/amphibole minerals, sometimes altered feldspar
igneous
Aura Quartz (specifically Titanium Aura Quartz)
Titanium-coated Silicon Dioxide (SiO2 + Ti Coating)
mineral
Man-made Polished Porcelain Tile (Artificial Geologic Lookalike)
Fused Silicate Ceramic with Alumina (Synthetic Kaolinite derivative)
Synthetic (Ceramic)
Opalite
Synthetic Opalized Glass
gemstone
Opalite (Synthetic Moonstone/Opal)
Synthetic Silica Glass
mineraloid (synthetic)
Aluminum Slag
Anthropogenic Aluminum (Al)
mineral
Colorless quartz crystal (likely quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Carborundum (Silicon Carbide)
Silicon Carbide (SiC) / Moissanite (natural form)
mineral
Rock crystal (clear quartz), possibly cloudy quartz
Quartz, silicon dioxide (SiO₂)
mineral
Sea Glass (specifically Frosted White)
Amorphous Silica (substance: Sodium-calcium silicate glass)
Mineraloid (Anthropogenic/Man-made rock)
Titanium Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
gemstone
Chert (Chalky Flint Node)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Asphalt Chunk
Asphalt concrete
man-made composite
Quartz crystal fragment (likely milky quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Tumbled black stone, likely black obsidian
Obsidian (volcanic glass; chiefly silica-rich rhyolitic composition)
igneous
Opalite Egg
Synthetic Glass (Simulated Opal)
mineral
Rainbow Hematite Ring
Iron(III) oxide (Fe2O3) with thin-film coating
mineral
Concrete with Aggregate
Artificial Conglomerate (Cement and Aggregate)
sedimentary
Opalite
Opalescent Glass (SiO2 + coloring agents)
Mineral (Synthetic/Man-made)