Amethyst (Digital/Conceptual Representation)
Amethyst (Silicon Dioxide with iron impurities, SiO2)
mineral
Category
Man Made Object (Ring)
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Red Moss Agate (Jasper)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
sedimentary
Amazonite
Potassium Feldspar (KAlSi3O8)
mineral
Ocean Jasper
Orbicular Jasper, Chalcedony (SiO2)
mineral
Yellow Jade (Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Satin Spar (Selenite variant)
Gypsum (Calcium Sulfate Dihydrate, CaSO4·2H2O)
mineral
Amethyst
Silicon dioxide with iron impurities (SiO2)
mineral
Banded Calcite (often sold as 'Green Onyx')
Calcite (Calcium Carbonate, CaCO3)
sedimentary
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate - (Mn,Fe,Mg,Ca)SiO3)
mineral
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Lapis Lazuli
Lapis lazuli (primary mineral: Lazurite, (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Malachite
Malachite (Copper Carbonate Hydroxide, Cu2CO3(OH)2)
mineral
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Obsidian (Black Obsidian)
Obsidian (Volcanic Glass)
igneous
Lapis Lazuli
Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Malachite
Malachite (Copper carbonate hydroxide), Cu2CO3(OH)2
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Carnelian (a variety of Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Black Tourmaline (Schorl) in Matrix
NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)
mineral
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Carnelian (Chalcedony)
SiO2 (Silicon Dioxide with iron oxide inclusions)
gemstone
Greywacke (Stream Pebble with Quartz/Calcite Veins)
Greywacke sandstone / Metagraywacke
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Chalcedony (Carnelian/Agate)
Silicon Dioxide (SiO2)
mineral
Fossiliferous Sandstone / Quartzite Pebble
Sedimentary rock with skeletal fragments (e.g., Paleozoic crinoid/brachiopod fossils)
fossil
Carnelian (Tumbled Quartz/Chalcedony Pebble)
Silicon Dioxide (SiO2)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Black Onyx
Silicon Dioxide (SiO2)
mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Banded Agate (specifically Carnelian Agate)
Silicon Dioxide (SiO2)
mineral
Wonderstone (Sandstone)
Liesegang Banded Sandstone (SiO2 dominated)
sedimentary
Carnelian
Carnelian (a variety of Chalcedony); SiO2 (Silicon Dioxide)
mineral
Ferruginous Sandstone (Ironstone)
Iron-rich Arenite
sedimentary
Sandstone (Picture Sandstone)
Arenite (primarily SiO2 with iron oxide impurities)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Wonderstone
Banded Rhyolite (SiO2 with impurities)
igneous
Ferruginous Quartz (Carnelian/Sardine Jasper)
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) impurities
sedimentary/mineral
Carnelian
Carnelian (Cryptocrystalline Quartz, SiO2)
mineral
Sandstone (Ferruginous)
Arenite (Fe-bearing Clastic Sedimentary Rock)
sedimentary
Carnelian
Carnelian (SiO2 - Silicon Dioxide)
mineral
Carnelian
Chalcedony (Silicon Dioxide, SiO2)
mineral
Carnelian
Chalcedony (Silicon Dioxide / SiO2)
mineral