Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Man Made Object (Ring)
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Chert (often called Flint)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Banded Sandstone (Liesegang Rings)
Arenite with Liesegang rings (SiO2/Fe2O3)
sedimentary
Lapis Lazuli
Lapis Lazuli (a rock, not a single mineral; primary mineral is Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2
Metamorphic rock
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
sedimentary
Fossilized Oyster Shell
Gryphaea or Exogyra (Family Ostreidae)
fossil
Bivalve Fossil in Sedimentary Matrix
Fossiliferous Mudstone (Class: Bivalvia)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Red Coral (Precious Coral)
Corallium rubrum (Calcium Carbonate, CaCO3)
sedimentary
Carnelian Agate
Silicon Dioxide (SiO2) - Chalcedony variety
mineral
Petrified Wood
Silicified Wood (primarily Quartz/SiO2)
mineral
Orange fire opal jewelry
Precious opal, hydrated amorphous silica (SiO₂·nH₂O)
gemstone
Mystic Topaz
Al2SiO4(F,OH)2 (Coated)
gemstone
Carnelian
Silicon dioxide (chalcedony variety), SiO2
gemstone
Carnelian Agate
Chalcedony (SiO2 with Iron Oxides)
sedimentary
Moonstone (Feldspar)
Orthoclase Feldspar KAlSi3O8 / Albite NaAlSi3O8
gemstone
Sunstone
Oligoclase (Plagioclase Feldspar) with hematite or copper inclusions
mineral
Green Onyx
Chalcedony (Silicon Dioxide, SiO2)
gemstone
Lake Superior Agate
Chalcedony (Microcrystalline Quartz, SiO2) with iron impurities
sedimentary
Diamond
Diamond (pure carbon, C)
gemstone
Sunstone / Peach Moonstone (Feldspar variety)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Citrine
Silicon Dioxide (SiO2) with iron impurities
gemstone
Chrysoprase
Nickel-bearing Chalcedony (SiO2 with inclusions of Ni-compounds like kerolite or pimelite)
mineral
Amethyst
Silicon dioxide with iron impurities (SiO2 + Fe3+)
mineral
Aquamarine
Beryl (Be3Al2Si6O18 with iron impurities)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone (Green Moonstone / Garnierite)
Potassium Aluminum Silicate (KAlSi3O8) with inclusions of Garnierite
mineral
Larimar
Blue Pectolite (NaCa2Si3O8(OH))
mineral
Amethyst
Silicon Dioxide (SiO2) with trace Iron (Fe3+)
mineral
Bloodstone
Heliotrope (Chalcedony)
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Pearl
Calcium Carbonate (Aragonite) with Conchiolin; formula: CaCO3
mineral
Heliotrope (Bloodstone)
Silicon Dioxide (SiO2) with Hematite inclusions
mineral
Black Onyx
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Bloodstone
Heliotrope (Cryptocrystalline Quartz, SiO2)
mineral
Petoskey Stone
Hexagonaria percarinata
sedimentary
Dinosaur Bone (Gembone)
Agatized Dinosaur Bone (Silicified Paleo-osteoid)
metamorphic
Carnelian (Chalcedony)
Silicon Dioxide (SiO2)
mineral
Quartz Druzy (on Matrix)
Silicon Dioxide (SiO2)
mineral
White Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Druzy Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral