Organic Material (Likely A Fruit Or Berry)

Fossilized Shark Tooth

Selachimorpha fossil

Amber

Succinited (C10H16O)

Fossilized ammonite fragment

Ammonoidea; likely an ammonite suture-section specimen, commonly Jurassic–Cretaceous

Polished amber-colored stone, possibly chert or jasper

Uncertain from image; likely microcrystalline quartz (SiO₂) if chert/jasper

Bivalve seashell

Calcareous shell, primarily aragonite (CaCO₃); likely a modern cockle or related bivalve

Graphite-rich metamorphic rock (probable graphite schist)

Graphite schist; predominantly graphite (C) with quartz and mica

Pink shell fragment

Calcium carbonate, likely aragonite or calcite (CaCO₃); probably a bivalve or gastropod shell fragment

Polished jasper, likely orbicular or brecciated jasper

Jasper: microcrystalline quartz (chalcedony), SiO₂, colored by iron oxides and other inclusions

Chert (Chalcedony/Agate)

Microcrystalline Quartz (SiO2)

Polished fossiliferous limestone (likely crinoidal or coral limestone)

Bioclastic carbonate rock, chiefly calcite (CaCO₃)

Polished Baltic amber with insect inclusion

Amber (fossilized plant resin), chiefly polymerized diterpenoid resin; likely succinite

Banded Chert (likely Flint or Jasper variety)

Silicon Dioxide (SiO2)

Mother of Pearl (Nacre)

Aragonite (CaCO3) with Organic Matrix

Flint (chert) with chalcedony/quartz

Microcrystalline quartz, SiO₂; likely flint or siliceous chert with a chalcedonic edge

Shungite

Non-crystalline carbonoid (Shungite)

Pyrite in Shale

Iron Disulfide (FeS2)

Fossiliferous Limestone

Fossiliferous Limestone (CaCO3)

Fossilized Bone

Petrified Bone / Biogenic Sedimentary

Petrified Wood

Silicified Wood (primarily SiO₂ - Silicon Dioxide)

Chert (with Epidote/Quartz veining)

Cryptocrystalline silica (SiO2) with Epidote/Quartz inclusions

Fossilized wood (petrified wood), likely silicified

Petrified wood; predominantly microcrystalline quartz (SiO₂) replacing wood tissue

Petrified Wood

Petrified Wood (Silicified Wood)

Black Limestone with Calcite Veins

Limestone (Calcium Carbonate, CaCO3)

Chert / Flint

Microcrystalline Quartz (SiO2)

Fossilized Bone Fragment

Vertebrate Fossil

Yellow calcite fragment

Calcite (CaCO₃), likely honey/yellow calcite

Petrified Wood

Silicified Wood (SiO2)

Amber (likely beach-worn amber or resinous material)

Fossilized plant resin; predominantly organic terpenoid polymers (succinite)

Green Jasper (with Quartz veining)

Jasper (Silica-rich microcrystalline variety of Quartz), formula: SiO2

Banded chert or flint

Microcrystalline quartz (SiO₂), likely with iron-oxide and dark organic/mineral impurities

Moss agate (likely dendritic/chalcedony slab)

Cryptocrystalline quartz, SiO₂, with green amphibole or chlorite inclusions

Fossilized Shell in Limestone

Carbonate sedimentary rock with Bivalvia or Brachiopoda remains

Fossilized wood, likely silicified petrified wood

Silicified wood (fossil wood; commonly quartz/chalcedony replacing organic tissue)

Ironstone concretion (likely hematite-rich)

Ferruginous concretion; primarily iron oxides/hydroxides, commonly hematite (Fe₂O₃) and goethite (FeO(OH))

Graphite-bearing schist (probable)

Graphite–quartz–mica schist; chiefly graphite (C), quartz (SiO₂), and mica

Black Onyx and Mother of Pearl

Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)

Limestone and Quartz Gravel with Petrified Wood

Sedimentary gravel aggregate and fossilized wood

Jasper

Microcrystalline Quartz (SiO2)

Fossil Shark Tooth

Chondrichthyes (Class)

Jasper

Silicon dioxide (SiO2)

Chert (Iron-stained)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Fossiliferous Limestone

Fossiliferous Limestone (containing bioclasts)