Dyed or synthetic turquoise-blue glass-like specimen
Likely man-made colored glass or resin; exact identification requires testing
mineral
Category
Not A Rock (Man Made Origin)
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N/A - Man-made object (Jewelry Chain)
Antiqued or Oxidized Metal Chain (often Steel or Brass)
Mineral (processed metal)
Chert (Arrowhead/Artifact Fragment)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Aura Quartz (Titanium/Rainbow Quartz)
SiO2 (Silicon Dioxide) with metallic coating
mineral
Sandstone Concretion
Clastic Sedimentary Concretion (typically Quartz/Silica with Iron Oxide)
sedimentary
Libyan Desert Glass
Libyan Desert Glass (SiO2 with trace elements)
mineral (impactite)
Mother of Pearl (Nacre)
Aragonite (CaCO3) with Organic Matrix
mineral
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Aura Quartz
Titanium-coated Silicon Dioxide (SiO2)
mineral
Opalite
Synthetic Opalized Glass (SiO2 + additives)
mineraloid (man-made)
Goldstone (with Tiger's Eye and Quartz)
Aventurine glass (Synthetic SiO2 with Cu inclusions)
mineral
Blue glassy gemstone cabochon, likely dyed chalcedony or glass
Uncertain; possible dyed chalcedony (microcrystalline quartz, SiO₂)
gemstone
Opalite (likely man-made glass)
Opalite; amorphous silica glass, not a natural mineral
gemstone
Tumbled milky quartz (likely)
Quartz, silicon dioxide (SiO₂)
mineral
Diamond
Carbon (C)
gemstone
Milky quartz (likely rough quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Aura Quartz (Pink/Rose Aura Quartz)
Silicon Dioxide (SiO2) bonded with Platinum and/or Silver
mineral
Polished black stone, likely black obsidian
Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)
igneous
Aqua Aura Quartz
Titanium/Gold-coated Silicon Dioxide (SiO2)
mineral
Carborundum (Silicon Carbide)
Silicon carbide (SiC)
mineral
Cultured Marble (Synthetic)
Polymer-matrix composite (typically calcium carbonate in polyester resin)
Synthetic / Composite Material
Opalite
Synthetic Fluorescent Glass (SiO2 + impurities)
mineraloid (synthetic)
Opalite
Synthetically produced glass (Silicon Dioxide with metallic inclusions)
Mineraloid (Man-made Glass)
Polished milky quartz (likely quartz worry stone or wand)
Quartz, silicon dioxide (SiO₂)
mineral
White quartz pebble
Quartz (SiO₂), likely milky quartz
mineral
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Opalite (Synthetic Opalized Glass)
Synthetic Silicon Dioxide (SiO2) glass
mineral
Tumbled quartz pebble
Quartz, silicon dioxide (SiO₂), likely milky quartz
mineral
Small greenish crystal/mineral fragment
Indeterminate; possibly olivine, quartz, or a green gemstone fragment
mineral
Titanium Coated Kyanite (Aura Kyanite)
Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating
metamorphic
Ferrous Slag
Iron/Steel Slag (Complex Calcium-Alumino-Silicates)
Anthropgenic (Industrial Byproduct)
Aura Quartz (Rainbow Quartz)
Silicon Dioxide (SiO2) with metallic vapor coatings
mineral
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Opalite
Synthetic opalescent glass
glass
Aqua Aura Quartz
Silicon Dioxide (SiO2) bonded with Gold (Au)
mineral (treated)
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Goldstone
Aventurine glass
mineral (man-made glass)
Green glass-like mineral specimen, likely fluorite
Fluorite (calcium fluoride, CaF₂), if natural; appearance may also indicate colored glass
mineral
Blue cabochon gemstone, likely synthetic glass or dyed stone
Indeterminate from image; possible glass, synthetic spinel, sodalite, or lapis lazuli
gemstone
Opalite (likely man-made opalescent glass)
Opalite; not a true mineral, typically synthetic opalescent glass (silica-based)
mineral
Brick fragment (Man-made material)
N/A (Fired clay)
man-made
Opalite (Man-made Glass)
Synthetic Opalised Glass
mineral