Mineral (Silicate Replaced Organic Material)

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Fossil Snail

Gastropoda (fossilized)

Tumbled brown quartz/chert pebble

Microcrystalline quartz (SiO₂), possibly chert or jasper

Fossilized Bark

Lepidodendron / Sigillaria fossil impression

Polished jasper or jasper-rich breccia

Microcrystalline quartz (SiO₂), commonly with iron oxides and other silicates

Polished gray metamorphic stone, likely marble

Calcite-dominant marble (CaCO₃), possibly dolomitic marble

Beryl (Emerald variety in host rock)

Be3Al2(SiO3)6 (Silicate mineral)

Amber

Succinite (fossilized resin, C10H16O)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert Nodules

Chert (SiO2)

Petrified Wood

Silicified wood (primarily quartz, SiO2)

Fossilized Coral

Cnidaria fossil / Calcite-replaced coral

Fossilized Wood (with Coal and Limonite)

Petrified Wood (Silicified or Carbonized Flora)

Enrolled Trilobite Fossil

Phylum Arthropoda, Class Trilobita (likely Calymene or Flexicalymene)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Chert (Field Flint)

Microcrystalline Quartz (SiO2)

Likely polished black-and-white stone fragment

Indeterminate from image; possibly tourmalinated quartz, black-and-white jasper, or coated stone

Petrified Wood

Silicified wood / Xylopal

Petrified Wood

Silicified Wood (primarily SiO2)

Chert (specifically Flint)

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron inclusions

Tumbled brown stone, likely jasper or fine-grained quartzite

Uncertain; probable microcrystalline quartz (SiO₂), possibly ferruginous jasper

Weathered iron-rich rock, possibly basalt or ironstone

Indeterminate; likely Fe-oxide-bearing basaltic rock (commonly magnetite/hematite in a silicate matrix)

Unakite

Epidotized Granite (Fe, Ca, Al silicate + KAlSi3O8)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Tumbled jasper pebble

Jasper, an opaque microcrystalline variety of quartz (SiO₂), commonly containing iron oxides and other silicates

Chert (specifically a Chert Nodule or Flint)

Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (Quartz replacement of organic wood structure)

Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)

Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)

Polished orbicular jasper (likely ocean jasper)

Jasper: microcrystalline quartz (SiO₂), with iron oxides and other silicate inclusions

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Fossil brachiopod or bivalve shell fragment

Likely a fossilized, ribbed brachiopod; exact genus/species cannot be determined from the image

Chert (and Jasper variety)

Microcrystalline Quartz (SiO2)

Fossilized Shark Teeth

Otodus sp. (Eocene Sand Tiger/Mackerel Shark)

Chert Pebble

Microcrystalline Quartz (SiO2)

Chert (River Cobble)

Chert (Cryptocrystalline Quartz, SiO2)

Chert (Flint Nodules)

Chert (Microcrystalline Quartz, SiO2)

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide / Chalcedony)

Yellow Beryl (Heliodor)

Beryllium aluminum silicate (Be3Al2Si6O18)

Chert (varietal: Jasper or Ironstone nodule)

Microcrystalline Quartz (SiO2) with iron oxides