Quartz Geode
Silicon Dioxide (SiO2)
mineral
Category
Anthropogenic Sedimentary Style Organic Solid
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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)
Gastropod Fossil (Snail Internal Mold)
Gastropoda; internal mold (steinkern), often composed of Calcium Carbonate (CaCO3) or Silica (SiO2)
sedimentary
Petrified Wood (Jet or Coalified Wood appearance)
Silicified wood (principally SiO2) or Carbonized Wood
sedimentary
Native Sulfur
Sulfur (S8)
mineral
Agate Geode / Nodular Chalcedony
Silicon Dioxide (SiO2) with impurities
mineral
Concrete Fragment
Hardened Portland cement and mineral aggregate
sedimentary (anthropogenic)
White Opal
Hydrated Amorphous Silica (SiO2·nH2O)
Mineraloid
Geode (Unopened)
Siliceous Concretion / Geode
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
fossil
Hematite Nodules (Moqui Marbles style)
Iron Oxide (Fe2O3)
mineral
White Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Concrete
Anthropogenic Sedimentary Conglomerate (Cement mixture: typically Ca2SiO4, Ca3SiO5, Ca3Al2O6)
sedimentary (artificial)
Chert breccia
Sedimentary Breccia (Microcrystalline Quartz)
sedimentary
Botryoidal Chalcedony (Agate)
Cryptocrystalline Quartz (SiO2)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineraloid
Ocean Jasper (Orbicular Jasper)
Silicon Dioxide (SiO2) with iron and other impurities
sedimentary
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Geode (Quartz)
Silicon Dioxide (SiO2)
mineral
Opal
Hydrated Silica (SiO2·nH2O)
mineral
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
Banded Gneiss
Gneiss (quartz-feldspar-biotite metamorphic rock)
metamorphic
Fired Clay Brick (Anthropic Rock substitute)
Anthropogenic polycrystalline ceramic (predominantly Mullite and Quartz: Al6Si2O13 + SiO2)
metamorphic (man-made / anthropic)
Chert (Agatized/Chalcedony variety)
Microcrystalline Quartz (SiO2)
sedimentary
Microcrystalline Limestone Pebble
Carbonate sedimentary rock (Calcium Carbonate, CaCO3)
sedimentary
Fossiliferous Shale
Carbonaceous Shale (with potential plant/aquatic fossils)
sedimentary
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Quartz Geode
Silicon Dioxide (SiO2) in a Secondary Formation
sedimentary
Wonderstone (Liesegang Sandstone)
Silicified Sandstone with Liesegang Rings (SiO2 + FeO(OH))
sedimentary
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble (River Rock)
Metamorphic Quartzite (predominantly SiO2)
metamorphic
Quartz Geode
Crystalline Silver Oxide (SiO2) in Calcareous Host
mineral
Chert (Jasper/Chalcedony mix)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz Geode
Silicon Dioxide (SiO₂)
mineral
Agate (Common Chalcedony)
Silicon Dioxide (SiO2)
mineral
Yellow Chalcedony (Carnelian/Yellow Agate)
Silicon Dioxide (SiO2) - Microcrystalline Quartz
Mineral
Pearls
Aragonite (calcium carbonate) and Conchiolin
Mineraloid
Opal
Hydrated amorphous silica (SiO2·nH2O)
mineral
Yellow Jasper
Silicon Dioxide with Iron inclusions (SiO2)
sedimentary
Jasper (Willow Creek/Desert style)
Silicon Dioxide (SiO2) with iron and clay impurities
sedimentary