Petrified Wood
Silicified Wood (SiO2)
fossil
Category
Organic (Sedimentary Context)
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Petrified Wood
Silicified Wood (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Dendritic Opal (Common Opal)
Amorphous Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Petrified Wood
Silicified wood (primarily quartz replacing organic cellulose)
fossil
Pyrite
Pyrite (FeS2)
Mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Petrified Wood
Silicified wood (Quartz/Chalcedony)
Sedimentary
Graphite-veined Quartzite
Meta-sedimentary Quartzite with Carbonaceous/Graphitic Inclusions (SiO2 + C)
metamorphic
Chert / Flint
Chert (varietal name for microcrystalline quartz). Chemical formula: SiO₂
Mineral
Petrified Wood
Silicified Wood (primarily SiO₂ - Silicon Dioxide)
metamorphic
Petrified Wood
Silicified wood (primarily quartz, SiO2)
fossil
Amber
Succinite
Organic (Mineraloid)
Petrified Wood
Silicified Wood / Fossilized Wood (SiO2)
sedimentary
Amber (Butterscotch/Egg Yolk Variety)
Succinite (Approx. C10H16O)
Organic Gemstone
Pyrite
Pyrite (Iron Disulfide), FeS2
Mineral
Amber
Succinite (a specific high-quality amber from the Baltic)
Organic Mineraloid
Petrified Wood
Silicified Wood / Xylopal
fossil
Amber (Cherry Amber)
Succinite (C10H16O)
Organic Gemstone
Amber
Succinite (Fossilized Resin C10H16O)
Organic Mineraloid
Conglomerate
Conglomerate
Sedimentary Rock
Polished petrified wood
Silicified wood, primarily microcrystalline quartz (SiO₂) replacing organic tissue
fossil
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Red Jasper
Red Jasper (variety of Chalcedony, SiO₂)
Mineral
Shale (possibly)
Shale (fine-grained clastic sedimentary rock)
sedimentary
Chert (varietal: Jasper or Flint likely, but definitive identification is difficult from image)
SiO₂ (silicon dioxide)
Sedimentary
Amber
Succinite (specifically for Baltic amber; general formula C10H16O)
Mineraloid (Organic)
Banded Chert
Chert (a microcrystalline variety of quartz, SiO2 with minor impurities)
Sedimentary
Amber (Black)
Amber (succinite, retinite, etc., specifically, heavily included/dark varieties)
Mineraloid
Asphalt
Asphalt concrete (engineered material, not a naturally occurring rock/mineral in this form)
Sedimentary
Cherry Creek Jasper (also known as Red Creek Jasper or Cherry Creek Agate)
Jasper, microcrystalline quartz (SiO₂)
Sedimentary Rock
Chalcedony Geode
Chalcedony (SiO2) within a geode structure
Mineral Geode/Sedimentary or Volcanic related
Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)
Chert (microcrystalline quartz)
Metamorphic Rock
Wood Jasper
Siliceous sedimentary rock (variety of Chert/Chalcedony)
Sedimentary
Travertine (used in construction, not a 'specimen' in situ)
Travertine
Sedimentary
Fossil Shark Tooth (Cretaceous white shark type)
Squalicorax (commonly known as Crow Shark)
Organic specimen (fossil)
Pyrite
Iron Pyrite (FeS2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Brachiopod Fossil (Spiriferid)
Order Spiriferida (Phylum Brachiopoda); mineralized as Calcite (CaCO3) or Chert (SiO2)
sedimentary (fossilized organic remain)
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Baltic Amber (Butterscotch or Egg Yolk Variety)
Succinite (C10H16O)
Organic Gemstone (Mineraloid)
Amber
Amber (Fossilized Tree Resin)
Mineral