Sandstone
Clastic sedimentary rock (Quartz arenite/Arkose)
sedimentary
Category
Man Made Object (Ring)
Browse man made object (ring) specimens identified by the Rock Identifier community.
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Carnelian
SiO2 (Silicon Dioxide) - Translucent reddish-brown variety of Chalcedony
mineral
Petrified Wood
Silicified wood (SiO2)
fossil
Diamond-set ring (likely lab-grown or natural diamonds)
Diamond, crystalline carbon (C)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Polished brown stone, likely smoky quartz or jasper
Tentatively quartz (SiO₂), possibly smoky quartz; exact identification requires testing
mineral
Unidentified Small Rock
Unknown
undetermined
Pearl
Calcium Carbonate (mostly Aragonite), CaCO3 (with conchiolin)
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Cut gemstone ring, likely diamond
Diamond (carbon, C), faceted gemstone; exact stone identification is uncertain from the image
gemstone
Amethyst
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Diamond
Native Carbon (C)
mineral
Man-made Synthetic Material (Not a rock or mineral)
Polyester (Polyethylene terephthalate) / Faux Fur
Synthetic / Textile
Man-made Synthetic Material (Costume Faux Fur)
Synthetic Polymer (Polyester/Acrylic)
not a rock
Terracotta (Man-made ceramic brick fragment)
Baked clay / High-iron ceramic (Silicate-based ceramic)
Anthropogenic material (Man-made sedimentary mimic)
Black onyx-style gemstone ring
Likely chalcedony (microcrystalline quartz, SiO₂), possibly dyed black; identification from the photo is uncertain
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Dyed Quartz Geode
Silicon Dioxide (SiO2) with artificial pigment
mineral
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Small weathered mineral/rock fragment
Indeterminate; possibly quartz-bearing feldspathic rock or calcite-rich specimen
mineral
Jadeite Ring
Jadeite (NaAlSi2O6)
gemstone
Sandstone
Arenite (SiO2 primarily)
sedimentary
Diamond
Carbon (C)
gemstone
Blue goldstone
Man-made aventurine glass containing metallic copper particles; not a natural mineral
mineral
Blue chalcedony cabochon (probable)
Chalcedony, a cryptocrystalline variety of quartz; silicon dioxide, SiO₂
gemstone
Hematite Beads
Hematite (Fe2O3)
Mineral
Opalite (a synthetic glass, often confused with Opal)
Silicon dioxide glass (SiO2nH2O, for natural opal)
Synthetic (glass)
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Diamond ring
Diamond (crystalline carbon, C)
gemstone
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Petrified Wood (Silicified Wood)
Silicified Paleoflora (mainly Quartz, SiO2)
metamorphic
Blue glassy mineral specimen, possibly dyed or synthetic
Uncertain; possible blue fluorite (CaF₂), dyed chalcedony, or man-made glass
mineral
Jasper
Silicon Dioxide (SiO2) with impurities, microcrystalline quartz
sedimentary
Sandstone (Water-worn Cobble)
Arenite (SiO2 with CaCO3 or Fe2O3 cement)
sedimentary
Polished yellow jasper cabochon
Jasper, microcrystalline quartz (SiO₂) with iron-oxide and clay inclusions
metamorphic
Tumbled carnelian
Carnelian, orange-red chalcedony (microcrystalline quartz; SiO₂)
gemstone
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
Carnelian Agate
Silicon Dioxide (SiO2) - variety of Chalcedony
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary