Chert (specifically Flint or Common Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Category
Organic Gemstone
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Chert (specifically Jasper/Agate variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Yellow Jasper/Flint pebble)
Microcrystalline Quartz (SiO2)
sedimentary
Fossiliferous Chert
Silicon Dioxide (SiO2) with fossil inclusions
sedimentary
Limestone (Weathered)
Calcium Carbonate (CaCO3)
sedimentary
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
mineral
Peridot
Olivine (Mg, Fe)2SiO4
mineral
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Shale
Shale (clay-sized silicate minerals)
sedimentary
Pickled Dragon Eggs (Fictional Interpretation: Purple Agate or Amethyst Geodes)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Carbonaceous Chondrite (CV3 type)
Carbonaceous Chondrite (CV3 group)
meteorite
Coquina
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (with Quartz vein)
Chert (Silicon Dioxide, SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
Mineral / Fossil
Emerald (Faceted Gemstone)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Amber
Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O
Organic mineraloid
Pearl
Calcium carbonate (CaCO3) - Aragonite/Calcite variety
mineral
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
gemstone
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)3(OH))
gemstone
Pink Spinel
Magnesium Aluminum Oxide (MgAl2O4)
gemstone
Amethyst (Faceted Gemstone)
Silicon Dioxide (SiO2) with iron impurities
mineral
Precious Opal
Hydrated silica (SiO2·nH2O)
mineraloid
Cubic Zirconia and Synthetic Ruby Jewelry
Cubic Zirconia (ZrO2) and Synthetic Corundum (Al2O3)
gemstone
Turquoise (with Hematite)
CuAl6(PO4)4(OH)8·4H2O
mineral
Spiny Oyster Shell
Spondylus (Calcium Carbonate, CaCO3)
mineral
Precious Opal in Matrix
Hydrated Silica (SiO2·nH2O)
mineral
Chert (River Stone)
Silicon Dioxide (SiO2)
sedimentary
Chert (Brown Chert / Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified wood (Quartz pseudomorph after wood)
fossil
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Flint or Jasperoid)
Silicon Dioxide (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
mineral
Chert (Flint)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Chert (Field Stone)
Microcrystalline / Cryptocrystalline Quartz (SiO2)
sedimentary
Quartzite with inclusions
Quartzite
metamorphic
Septarian Nodule (Polished)
Septarian concretion (Calcite, Aragonite, Limestone)
sedimentary
Petrified Wood
Silicified Wood (SiO2)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (with Limestone/Dolomite host)
Microcrystalline Quartz (SiO2)
sedimentary