Organic Material (Likely A Fruit Or Berry)

Chert (Brecciated Chert)

Silicon Dioxide (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement)

Fine-grained brown sand or weathered soil

Unconsolidated siliciclastic sediment, likely quartz-rich sand (SiO₂) mixed with iron-oxide-coated grains

Sand Tiger Shark Tooth Fossil

Carcharias taurus (fossilized tooth)

Chert with Druzy Quartz Geode

Microcrystalline Quartz (SiO2)

Petrified Wood (Silicified Wood)

Silicified Paleoflora (mainly Quartz, SiO2)

Chert (Common Opal/Jasper variety)

Microcrystalline Quartz (SiO2) with hydration

Likely chert or flint

Microcrystalline quartz (SiO₂), commonly called chert; exact identification requires testing

Jasper with Chert

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Potassium-Rich Silicate Clay (inferred from biological context)

Phyllosilicate group (likely Illite or Smectite within surrounding soil substrate)

Chert (Green River Chert)

Microcrystalline Quartz (SiO2)

Chert (Yellow/Tan Variety)

Chert (SiO2)

Petrified Wood

Silicified Wood (primarily SiO2)

Tumbled moss agate (likely)

Chalcedony, microcrystalline quartz (SiO₂), with iron/manganese inclusions

Chert (Jasper variety)

Chert (Silicon Dioxide, SiO2)

Polished agate-like stone (uncertain; possibly a fossil or shell fragment)

Likely microcrystalline quartz (chalcedony), SiO₂; exact identification is limited by the image

Weathered gray-green rock fragment

Likely shale or mudstone; exact identification requires testing

Fossiliferous Siltstone

Clastic Sedimentary Rock with Fossil Inclusions

Chert (Nodule)

Microcrystalline or Cryptocrystalline Silica (SiO2)

Pink coral and green-stone jewelry

Likely pink coral (calcium carbonate, CaCO₃) set with an unidentified green stone; the image is too indistinct to identify the green material reliably.

Sandstone (with carbonaceous plant fragments)

Arenite (composed primarily of SiO2)

Sandstone (likely Arkose or Quartz Sandstone)

Arenite (SiO2 principal component)

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Silicified Wood (primarily Quartz or Chalcedony, SiO2)

Amber

Succinite (fossilized resin, C10H16O)

Chert (Jasper/Agate variety)

Microcrystalline Quartz (SiO2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Chert (Nodule / Geode fragment)

Microcrystalline Quartz (SiO2)

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert; exact variety uncertain from the image

White seed-bead gemstone strand, likely freshwater pearl or shell pearl

Pearl: nacreous calcium carbonate, chiefly aragonite (CaCO₃) in conchiolin; identification uncertain from image

Chert (Jasper/Flint variety)

Silicon Dioxide (SiO2)

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Petrified Wood

Silicified Wood (primarily SiO₂)

Banded agate (likely petrified wood or silicified sediment)

Microcrystalline quartz/chalcedony, SiO₂; possible silicified wood

Weathered fossilized wood (likely petrified wood)

Silicified wood; commonly quartz/chalcedony replacing wood tissue (SiO₂)

Fossilized coral or silicified organic limestone

Likely fossil coral (Scleractinia/Tabulata) replaced or cemented by calcite and silica; exact identification requires close examination

Fossiliferous limestone (likely ammonite/gastropod-bearing)

Bioclastic limestone; predominantly calcite (CaCO₃)

Yellow Chert (Jasper)

Cryptocrystalline Quartz (SiO2)

Fossil bone or tooth fragment

Indeterminate fossilized vertebrate bone/tooth; taxonomic identification is not possible from this blurred image

Polished ornamental jasper (likely Peanut Wood or similar brecciated jasper)

Microcrystalline quartz/chalcedony (SiO₂), with iron-oxide and clay inclusions

Chert (Flint)

Chert (Microcrystalline Quartz, SiO2)

Chert (likely brown flint)

Microcrystalline quartz, SiO₂ (chalcedonic quartz aggregate)