Agate (Sliced and Carved)
Silicon Dioxide (SiO2) - Banded Chalcedony
mineral
Category
Mineral (Specifically A Mineraloid)
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Chalcedony Agate / Carnelian nodules in Matrix
SiO2 (Silicon Dioxide) with iron oxide inclusions
mineral
Tektite
Tektite (meteoritic glass)
meteorite
Limonite pseudomorph after pyrite
Goethite / Limonite pseudomorph after Pyrite (Fe3+O(OH) replacing FeS2)
mineral
Goethite
Goethite (FeO(OH))
mineral
Lake Superior Agate
Silicon Dioxide (Cryptocrystalline Quartz), SiO2
mineral
Botryoidal Chalcedony
Silicon Dioxide (SiO2)
mineral
Alexandrite
Chrysoberyl (BeAl2O4 with Chromium impurities)
mineral
Quartz (Citrine variety)
Silicon Dioxide (SiO2)
mineral
Shattuckite (Blue Quartz/Jasper Matrix)
Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)
mineral
Quartz Geode with Goethite/Hematite
Silicon Dioxide (SiO2) with Iron Oxides
mineral
Turquoise in Matrix
Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
mineral
Almandine Garnet
Almandine (Fe3Al2(SiO4)3)
mineral
Emerald
Beryl (Be3Al2(SiO3)6) with trace Chromium/Vanadium
mineral
Fire Opal in Host Rock
Amorphous Hydrous Silica (SiO2·nH2O)
mineral
Chalcedony (Agate Pebble)
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
Smoky Quartz with Feldspar
SiO2 (Quartz) with KAlSi3O8 (Potassium Feldspar)
mineral
Gold-bearing Quartz and Pyrite
Auriferous Quartz (SiO2 + Au) with Pyrite (FeS2)
mineral
Chrysocolla on Matrix
Hydrated copper silicates ((Cu,Al)2H2Si2O5(OH)4·nH2O)
mineral
Goethite pseudomorph after Pyrite
Goethite (FeO(OH)) pseudomorph after Pyrite (FeS2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)
mineral
Smoky Quartz (Herkimer-style)
Silicon Dioxide (SiO2)
mineral
Agate
Chalcedony (SiO2)
sedimentary
Amazonite
K(AlSi3O8)
mineral
Granite
Phaneritic plutonic rock (SiO2 rich)
igneous
Granite or Pegmatite with Quartz and Feldspar
Granitoid
igneous
Green Aventurine
Quartz (SiO2) with fuchsite inclusions
mineral
Basalt with Quartz Vein
Mafic Igneous Rock (SiO2 filling)
igneous
Granite Pebble
Intrusive Igneous Rock
igneous
Gold Nugget
Native Gold (Au)
mineral
Basalt (Black Beach Pebble)
Basalt
igneous
Amethyst
Silicon Dioxide (SiO2), Quartz variety
mineral
Amethyst
Silicon Dioxide (SiO2 with iron impurities)
mineral
Amethyst
Amethyst (SiO2 with Iron impurities)
mineral
Granite
Intrusive igneous rock
igneous
Granite
Intrusive Igneous Rock
igneous
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Ruby (varieties of Corundum)
Aluminum oxide (Al2O3) with Chromium traces
mineral
Granite
Intrusive Igneous Rock
igneous