Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Category
Man Made Object (Ring)
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Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Aventurine
Quartz containing inclusions of Fuchsite (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)
metamorphic
Ferro-silicate Slag
Industrial Vitrified Slag (High-silica amorphous glass)
Mineral byproduct (Anthropogenic)
Tumbled blue chalcedony (possibly blue agate)
Microcrystalline quartz, SiO₂; chalcedony variety
mineral
Green glassy mineral fragment, possibly fluorite
Fluorite (calcium fluoride, CaF₂), tentative identification
mineral
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral
Smelter Slag
Anthropogenic Silicate Slag
igneous
Diamond
Native Carbon (C)
mineral
Malachite
Malachite (Cu2CO3(OH)2)
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Pearl
Biogenic Calcium Carbonate (Aragonite/Calcite), CaCO3
mineral
Tumbled black obsidian (likely)
Volcanic glass; chiefly silica-rich rhyolitic glass (SiO₂)
igneous
Polished stromatolite (likely fossilized microbial mat)
Fossil stromatolite; chiefly microcrystalline quartz (SiO₂), commonly replacing carbonate
fossil
Rainbow Hematite (Man-made/Treated)
Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)
mineral
Glass / Silicon Dioxide (Man-made)
SiO2 (Amorphous Silicon Dioxide)
Amorphous Solid
Man-made Blank Ammunition (Brass)
CuZn (Cartridge Brass - roughly 70% Copper, 30% Zinc)
Anticrystalline / Synthetic Alloy
Carved Stone Turtle
Mixed stone carving
carved stone
Quartz (Agate/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chipped Glass/Plastic Fragment
Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic
Man-made material (simulant/artifact)
Agate
Silicon Dioxide (Chalcedony), SiO2
gemstone
Man-made Glass (Tumbled/Shaped)
Amorphous Silicon Dioxide (SiO2) with metal oxide colorants
Mineraloid (synthetic)
Man-made Slag (Industrial Byproduct)
Anthropogenic Glassy Residue
not a natural rock
Man-made Dyed Aura Quartz
Silicon Dioxide (SiO2) with metallic coating/dye
mineral
Jewelry (Ring)
This image does not contain a rock, mineral, or geological specimen. The object in the image is a piece of jewelry, specifically a ring with a pentagram and what appears to be a red gem or stone set in the center.
Diamond
Diamond (pure native carbon, C)
mineral
Diamond (as featured in jewelry)
Diamond (C - pure carbon)
mineral
Libyan Desert Glass
Impact-melt silica glass (SiO2 + traces of Al, Fe, Ti)
mineral (Tektite/Impactite)
Blue sea glass or blue glassy mineral fragment
Uncertain; likely man-made soda-lime glass, not a natural mineral
mineral
Blue glassy fragment among beach gravel
Likely cobalt-blue man-made glass; not a natural mineral specimen
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid
Slag Glass (Cullet)
Amorphous Silica (man-made), primarily SiO2 with trace metal oxides
Mineraloid / Synthetic Glass
Goldstone
N/A (Synthetic Glass with Copper Inclusions)
Manufactured Glass
Amethyst ring
Amethyst, purple quartz (SiO₂)
gemstone
Green sea glass (likely slag glass or bottle glass)
Man-made soda-lime silicate glass; not a naturally occurring mineral
mineral
Green Sea Glass
Amorphous Silica (man-made glass), SiO2 + additive metal oxides
mineraloid / anthropogenic (man-made origin)
Red cabochon gemstone, likely carnelian or red agate
Cryptocrystalline quartz (chalcedony), SiO₂
gemstone
Fossil crinoid columnal in limestone
Crinoidea indet.; calcitic ossicle (CaCO₃)
fossil
Diamond
Carbon (C)
gemstone
Yellow Chalcedony (Yellow Agate)
Silicon Dioxide (SiO2)
gemstone
Diamond
Carbon (C)
gemstone
Small dark pebble, likely basalt or iron-rich rock
Uncertain from image; possibly fine-grained basalt (mafic silicate rock)
igneous