Polished brown stone, likely smoky quartz or jasper
Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing
mineral
Category
Man Made Object (Ring)
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Diamond (as set in a metal alloy ring)
Diamond (Pure Carbon, C)
mineral
Diamond
Carbon (C)
mineral
Cobalt Glass Slug (Cullet)
Man-made Silicate Glass with Cobalt Oxide (CoO)
mineraloid
Raw quartz crystal
Quartz (silicon dioxide, SiO₂), likely milky or included quartz
mineral
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Blue Goldstone
Synthetic Avanturine Glass (or Aventurine Glass)
Synthetic Glass
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Agate
Silicon dioxide (Chalcedony), SiO2
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Sea Glass
Amorphous silicon dioxide (SiO2) - Man-made glass tumbled by nature
mineral
Carnelian
SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony
mineral
Sandstone (with man-made markings)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Black jade or dark serpentine cabochon
Jadeite (NaAlSi₂O₆) or nephrite amphibole; possibly serpentine (Mg₃Si₂O₅(OH)₄)
gemstone
Amethyst
Quartz (Silicon Dioxide, SiO2)
mineral
Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2) or Jadeite (NaAlSi2O6)
metamorphic
Smelter Slag
Anthropogenic Silicate Slag
igneous
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)
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Diamond (Cut and Polished)
Diamond (pure Carbon, C)
gemstone
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.
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Tumbled carnelian
Carnelian, a red-orange variety of chalcedony (microcrystalline quartz, SiO₂)
gemstone
Sunstone (Aventurine Feldspar)
(Ca,Na)((Al,Si)2Si2O8) with inclusions of Cu or Fe2O3
mineral
Diamond
Diamond (pure Carbon, C)
mineral
Jasper with Quartz Vein
Microcrystalline Quartz (SiO2)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Pearl
Aragonite / Calcium Carbonate (CaCO3)
mineraloid
Petrified Wood
Silicified Wood (primarily Quartz/Chalcedony, formula: SiO2)
sedimentary
Jasper
Silicon Dioxide (Microcrystalline Quartz)
sedimentary
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Cubic Zirconia (Man-made)
Cubic Zirconia (ZrO2) with Enamel and Metal Alloy
mineral
Turquoise
Hydrous phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
gemstone
Diamond (in a cluster setting)
Crystallized Carbon (C)
mineral
Asphalt Chunk
Asphalt concrete
man-made composite
Diamond
Native Carbon (C)
mineral
Petrified Wood
Silicified Wood (Permineralized organic tissue)
fossil
Precious Coral (Red Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
mineral