Tumbled chalcedony or agate
Microcrystalline quartz (SiO₂), likely porous/botryoidal chalcedony with possible agate banding
mineral
Category
Synthetic Or Natural Fiber
Browse synthetic or natural fiber specimens identified by the Rock Identifier community.
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Polished pink quartz cabochon
Quartz (SiO₂), likely rose quartz or included quartz
gemstone
Honey-colored amber
Amber (fossilized plant resin; chiefly polymerized terpenoid compounds)
gemstone
Likely amethyst cabochon ring
Quartz, SiO₂; purple coloration from trace iron and irradiation
gemstone
Goldstone
Avventurina (Man-made Glass with Copper inclusions)
mineral
Champagne topaz (likely)
Topaz, Al₂SiO₄(F,OH)₂
gemstone
Tiger’s-eye
Quartz variety, SiO₂, with fibrous crocidolite pseudomorphed by quartz
gemstone
Nephrite Jade
Ca2(Mg,Fe)5Si8O22(OH)2
metamorphic
Smoky Quartz (with Druzy/Polished Edge)
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Tumbled chalcedony (likely carnelian or jasper)
Microcrystalline quartz, SiO₂; reddish varieties are carnelian, while more opaque material may be jasper
mineral
Faceted yellow gemstone, likely citrine
Citrine (quartz), SiO₂; possibly yellow sapphire or synthetic glass without testing
gemstone
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Tiger's Eye (Multicolor/Variegated)
Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxides)
mineral
Ruby (faceted gemstone)
Corundum (Al2O3 with Cr impurities)
gemstone
Blue Tiger's Eye (Hawk's Eye)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Polished amethyst cabochon
Amethyst, purple quartz (SiO₂)
gemstone
Faceted quartz crystal sphere (likely rock crystal)
Quartz, silicon dioxide (SiO₂)
gemstone
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Opal cabochon
Opal, hydrated amorphous silica (SiO₂·nH₂O), likely common or Ethiopian precious opal
gemstone
Diamond
Diamond (C - Pure Carbon)
gemstone
Tumbled tiger’s-eye
Tiger’s-eye quartz, microcrystalline SiO₂ with fibrous crocidolite pseudomorphs
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
mineral
Blue Sapphire
Corundum (Al2O3) with traces of Iron and Titanium
mineral
Lapis Lazuli
Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2
metamorphic
Blue Agate Geode (Dyed)
Cryptocrystalline Quartz (SiO2)
mineral
Polished tiger’s-eye and jasper specimen
Quartz (SiO₂), chiefly fibrous chatoyant quartz, with iron-oxide-rich jasper/goethite
gemstone
Turquoise cabochon pendant
Turquoise, hydrated copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Goldstone (Red/Brown)
Aventurine Glass (SiO2 with Copper inclusions)
Mineral (Man-made glass)
Amethyst ring
Amethyst, purple quartz (SiO₂)
gemstone
Orange Sapphire
Corundum (Al2O3)
gemstone
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Clear quartz sphere
Quartz (silicon dioxide, SiO₂), likely rock crystal or low-grade milky quartz
mineral
Jade bangle
Likely nephrite jade (actinolite–tremolite amphibole); possibly jadeite
gemstone
Polished turquoise cabochon pendant
Turquoise, hydrated copper-aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O; likely stabilized or matrix-bearing material
mineral
Tanzanite earrings
Tanzanite, blue-violet zoisite (Ca₂Al₃(SiO₄)₃(OH))
gemstone
Polished greenstone pebble
Likely nephrite jade (tremolite–actinolite), though serpentine or greenstone is possible from appearance alone
metamorphic
Diamond
Diamond (C)
mineral
Blue chalcedony cabochon
Microcrystalline quartz (SiO₂), chalcedony variety
gemstone
Polished pink banded agate
Microcrystalline quartz (chalcedony), SiO₂
mineral
Diamond (Faceted)
Diamond (Pure Carbon, C)
gemstone
Rainbow carborundum (silicon carbide)
Silicon carbide, SiC; commonly synthetic moissanite/carborundum specimen
mineral