Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Category
Anthropogenic Sedimentary Style Organic Solid
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Fossil Shark Tooth
Carcharodon carcharias (modern/recent) or similar Lamniform fossil
fossil
Native Sulfur
Sulfur (S8)
mineral
Geode Nodules / Chalcedony Geode
Silicon Dioxide (SiO2) - Amorphous to Cryptocrystalline Quartz
sedimentary
Quartz (Engineered Stone Countertop)
Silicon Dioxide (SiO2) with polymer resins
Sedimentary-like (Industrial Composite)
Geode (Quartz / Chalcedony Geode)
Silicon Dioxide (SiO2) - Quartz / Chalcedony
sedimentary
Agate Geode / Nodular Chalcedony
Silicon Dioxide (SiO2) with impurities
mineral
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Black Onyx
Silicon Dioxide (SiO2) - Chalcedony variety
gemstone
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Geode (Unopened Keokuk Geode)
Silicon Dioxide (SiO2) - Chalcedony / Quartz exterior
mineral
Geode Nodules / Keokuk Geode
Quartz / Chalcedony Geode (SiO2)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other impurities
sedimentary
Fossiliferous Sandstone
Sedimentary rock containing invertebrate fossils
fossil
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Jasper (Willow Creek/Desert style)
Silicon Dioxide (SiO2) with iron and clay impurities
sedimentary
Wishing Rock (Quartz Vein in Host Rock)
Silicon dioxide (SiO2) vein in various host rocks
Igneous/Sedimentary/Metamorphic with Mineral Vein
Pyrite
Iron Sulfide (FeS2)
mineral
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Chert (Green Fossilized Algae or Jasper)
Silicon Dioxide (SiO2)
sedimentary
Opal
Hydrated Silica (SiO2·nH2O)
mineral
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Dendritic Jasper
SiO2 (Microcrystalline Quartz)
mineral
Druzy Quartz Geode (Partially Open)
Silicon Dioxide (SiO2) within Sedimentary Host Rock
sedimentary
Black Limestone
Bituminous Limestone (Calcium Carbonate - CaCO3)
sedimentary
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
sedimentary
Microcrystalline Limestone Pebble
Carbonate sedimentary rock (Calcium Carbonate, CaCO3)
sedimentary
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
sedimentary
Sea Shell (Mollusk Shell)
Calcium Carbonate (Aragonite/Calcite)
fossil
Fossil Coral (Petoskey-style Rugose Coral)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic