Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Category
Man Made Object (Ring)
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Emerald
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Moonstone
Orthoclase (KAlSi3O8), specifically the variety showing adularescence
mineral
Larimar
Pectolite (Blue variety), NaCa2Si3O10(OH)
mineral
Carnelian Agate
Chalcedony (SiO2 with iron oxide impurities)
mineral
Black Opal
Hydrated Silica (SiO2·nH2O)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Pearl
Organic Mineraloid (CaCO3 + Conchiolin)
mineral
Carnelian
Carnelian (SiO2)
mineral
Carnelian Agate
Chalcedony (Silicon Dioxide, SiO2) with Iron Oxide impurities
mineral
Tiger's Eye
Silicon Dioxide with inclusions (SiO2)
mineral
Moss Agate
Chalcedony (Silicon Dioxide) with inclusions - SiO2
mineral
Blue Topaz
Al2SiO4(F,OH)2
mineral
Prasiolite
Silicon Dioxide (SiO2) with iron impurities
mineral
Peach Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8) with inclusions
mineral
Carnelian (polished)
Carnelian (variety of Chalcedony), SiO2
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with iron impurities)
mineral
Agate Geode
Banded Chalcedony (Silicon Dioxide, SiO2) with Quartz crystals
mineral
Diamond
Carbon (C)
mineral
Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineral
Pearl
Aragonite and Conchiolin (CaCO3 + organic protein)
mineraloid
Peach Moonstone
Orthoclase Feldspar (KAlSi3O8)
mineral
Sunstone
Plagioclase Feldspar (Na,Ca)(Al,Si)4O8
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
mineral
Tiger's Eye
Tiger's Eye (Pseudomorph of Quartz after Crocidolite), SiO2
metamorphic
Amethyst
Silicon dioxide (SiO2)
mineral
Amethyst
SiO2 (Silicon Dioxide with iron impurities)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Red Garnet
Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)
mineral
Herkimer Diamond
Quartz (Silicon Dioxide) - SiO2
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Tiger's Eye
Titanium-containing Quartz (Silica: SiO2)
Mineral
Amethyst (Tumbled)
Quartz (Silicon Dioxide, SiO2) with iron impurities
mineral
Polished agate, likely carnelian/fire agate
Microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides/hydroxides
gemstone
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Agate Geode
Chalcedony (cryptocrystalline SiO2)
mineral
Fossiliferous Limestone
Calcium carbonate (CaCO3) matrix with fossil inclusions
fossil
Synthetic Blue Aura Quartz
Silicon Dioxide (SiO2) with Metallic Infusion
mineral (synthetic/man-made coating)
Ferrous Slag (Iron Smelting By-product)
Fused Siliceous Slag
Anthropogenic Material (Man-made Rock)