Tumbled carnelian
Carnelian, a red-orange variety of cryptocrystalline chalcedony (SiO₂)
gemstone
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Painted River Rock
Artificially Coated Sedimentary Rock
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Green cabochon gemstone, likely aventurine or dyed chalcedony
Indeterminate from image; possible quartz variety (SiO₂), including aventurine quartz or chalcedony
gemstone
Blue Sapphire
Corundum (Al2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium impurities)
mineral
Blue chalcedony (likely dyed or coated)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Tiger’s eye
Quartz (SiO₂) with fibrous crocidolite pseudomorphs and iron oxides
metamorphic
Blue Goldstone
Aventurine Glass (SiO2 with Co and metallic inclusions)
mineral (synthetic glass)
Polished yellow-orange chalcedony (likely carnelian or yellow agate)
Microcrystalline quartz, SiO₂; chalcedony variety
gemstone
Corundum (variety Ruby/Sapphire)
Aluminum Oxide (Al2O3)
mineral
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2 (Calcium magnesium iron silicate hydroxide)
metamorphic
Blue Goldstone
Aventurine Glass (SiO2 with Cobalt/Copper inclusions)
man-made glass
Blue Sapphire
Corundum (Al2O3 with trace Titanium and Iron)
mineral
Mixed gemstone jewelry collection
Various gemstone minerals, including likely amethyst (quartz), sapphire or iolite, garnet, pearl, turquoise, and colored beryl or tourmaline
gemstone
White Sapphire
Corundum (Al2O3)
mineral
Ruby
Corundum (Al2O3 with Chromium traces)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Blue Sapphire
Corundum (Al2O3)
mineral
Chalcanthite
Copper(II) sulfate pentahydrate (CuSO4·5H2O)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Tumbled blue chalcedony
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Synthetic Resin (Artificial Specimen)
Polyurethane or Polyester Resin
mineraloid (man-made)
Tumbled carnelian (likely)
Carnelian, orange-red variety of cryptocrystalline silica (SiO₂), chalcedony
gemstone
Blue Sapphire
Corundum (Al2O3)
gemstone
Smoky Quartz
Silicon dioxide with aluminum impurities (SiO2)
mineral
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Tiger’s eye
Quartz (SiO₂), pseudomorphic fibrous quartz with crocidolite inclusions
mineral
Dyed Agate
Agate (Cryptocrystalline Quartz), SiO2
Mineral
Actinolite (likely fibrous amphibole)
Actinolite, Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂; possibly an actinolite–tremolite specimen
mineral
Sapphire
Corundum (Al2O3)
mineral
Tiger’s eye
Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂
gemstone
Amethyst cabochon ring
Amethyst, purple quartz (SiO₂)
gemstone
Polished yellow chalcedony (likely quartz pebble)
Chalcedony, microcrystalline quartz (SiO₂), possibly iron-stained jasper
mineral
Tumbled blue-gray chalcedony (likely blue agate)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Turquoise cabochon jewelry
Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
ABS Plastic (Acrylonitrile Butadiene Styrene)
(C8H8)x·(C4H6)y·(C3H3N)z
Synthetic Polymer (Synthetic Material)
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)
metamorphic
Bismuth
Bismuth (Bi)
mineral
Opalite
Man-made synthetic glass with opalescent effects (SiO2 + metal oxides)
mineraloid