Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Category
Anthropogenic (Man Made Artifact)
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Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Weathered sandstone pebble
Sandstone, likely quartz-rich (arkose or quartz arenite)
sedimentary
Blue-gray flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Basalt
Extrusive Mafic Igneous Rock (composed primarily of Plagioclase and Pyroxene)
igneous
Yellow Sapphire (Raw)
Corundum (Al2O3)
mineral
Flint or chert fragment
Microcrystalline quartz (SiO₂), commonly with chalcedony and minor impurities
sedimentary
Chert or flint flake
Cryptocrystalline microcrystalline quartz (SiO₂), likely chert/flint
sedimentary
Gray-green flint/chert fragment
Microcrystalline quartz (SiO₂), likely chert or chalcedony-rich material
sedimentary
Rounded river pebble
Indeterminate lithic clast; likely weathered sandstone or quartz-rich sedimentary rock
sedimentary
Sea Glass
Amorphous Silicon Dioxide (SiO2)
Mineral/Man-made
Crackle Glass (Simulated Gemstone)
Amorphous Solid (SiO2)
man-made glass
Blue Goldstone
Synthetic glass with copper or cobalt/manganese inclusions
man-made glass
Blue Goldstone
Synthetic Aventurescent Glass (Cobalt-doped soda-lime glass)
man-made glass
Blue Goldstone
Aventurine glass (Synthetic borosilicate glass with cobalt and metallic inclusions)
man-made glass
Green Glass Slag
Amorphous Silicon Dioxide (SiO2) with metal oxide impurities
mineraloid (man-made)
Porcelain (Stoneware Ceramic)
Mullite / Silica-glass composite (Al6Si2O13)
metamorphic (man-made)
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Goldstone (Brown)
Aventurine glass
mineraloid (man-made)
Grooved Maun Ball (Maul/Hammerstone-like Concretion)
Calcareous/Ferruginous Concretion in Sandstone Matrix
sedimentary
Jasper (likely red jasper or brecciated chert)
Microcrystalline quartz/chalcedony, SiO₂, colored mainly by iron oxides
sedimentary
Obsidian (likely black obsidian)
Volcanic glass; predominantly rhyolitic silica glass (SiO₂-rich)
igneous
Flint (chert), possibly worked
Microcrystalline quartz; SiO₂ (chalcedony/quartz aggregate)
sedimentary
Dark flint or chert fragment
Microcrystalline quartz (SiO₂), likely flint/chert
sedimentary
Diamond (or Cubic Zirconia simulant)
Carbon (C) - Diamond / Zirconium dioxide (ZrO2) - CZ
mineral
Moissanite
Silicon Carbide (SiC)
mineral
Diamond
Carbon (C)
mineral
Jadeite Jade
NaAl(Si2O6)
gemstone
Turquoise and Red Coral
CuAl6(PO4)4(OH)8·4H2O (Turquoise) and Corallium rubrum (Red Coral)
mineral
Conglomeratic gravel / polymictic breccia
Polymictic rudite, likely anthropogenic or beach/stream gravel; composition varies
sedimentary
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
gemstone
Diamond
Carbon (C)
mineral
Rough Corundum (Sapphire/Ruby mixture)
Corundum (Aluminum Oxide, Al2O3)
mineral
Diamond (Colorless/White)
Carbon (C)
mineral
Clear-stone silver-tone teardrop earring
The stones may be colorless quartz or glass; the image does not allow reliable identification. Metal setting appears silver-tone.
gemstone
Diamond
Carbon (C)
gemstone
Aura Quartz / Rainbow Aura Quartz
Silicon Dioxide (SiO2) with metallic vapor coating
mineral
Diamond
Carbon (C)
mineral
Corundum (Pink Sapphire / Ruby)
Al2O3 (Aluminum Oxide)
mineral