Organic Material (Likely A Fruit Or Berry)

Petrified Wood

Silicified Wood (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Amber

Succinite (fossilized resin, C10H16O)

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Chert (Jasper-rich)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Raw Amber / Resin Mineral

Succinite (Fossilized Tree Resin)

Chert (likely flint)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Fossil bivalve shell

Ribbed pectinid or related bivalve; originally calcite/aragonite (CaCO₃), likely partially mineralized

Possible fossilized bone or tooth fragment

Indeterminate fossilized vertebrate material; mineralized hydroxyapatite replaced or coated by silica/carbonate

Fossilized tooth, likely shark tooth

Fossilized selachian tooth; possibly a worn Otodus or related shark tooth

Polished amber-like agate or jasper carving

Likely chalcedony (microcrystalline SiO₂), possibly iron-stained carnelian/jasper; exact identification requires testing

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Petrified Wood

Silicified wood (Quartz/Chalcedony/SiO2)

Fossilized coral or stromatoporoid fragment

Likely tabulate coral (order Tabulata) or stromatoporoid; exact identification requires microscopy

Possible flint or black chert

Microcrystalline quartz (SiO₂), likely chert/flint

Petrified Wood

Silicified Wood (primarily SiO2)

Likely pyrite-bearing rock fragment

Pyrite, FeS₂, possibly in a dark host rock

Tumbled brown jasper (likely common jasper or chert)

Microcrystalline quartz, SiO₂, chiefly chalcedony/quartz with iron-oxide impurities

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

Tumbled amber (likely)

Amber; fossilized plant resin, commonly succinite (organic material rather than a mineral)

Jasper

Jasper (Silicon Dioxide, SiO2)

Likely tumbled yellow calcite or limestone fragment

Calcite (CaCO₃), possibly micritic limestone

Tumbled brown chalcedony or quartzite pebble

Microcrystalline quartz (SiO₂), likely chalcedony; exact identification requires testing

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)

Concretion (likely iron-rich sandstone or claystone concretion)

Diagenetic carbonate/iron-oxide concretion; exact mineralogy requires testing

Petrified Wood

Silicified Wood (SiO2)

Coal (likely bituminous coal)

Bituminous coal; predominantly carbon with organic macerals and minor clay/pyrite

Likely amber-colored chert or chalcedony fragment

Microcrystalline quartz (SiO₂), possibly iron-stained chert; exact identification is uncertain from the image

Graphite-rich metamorphic rock (likely graphite schist)

Graphite schist; predominantly graphitic carbon (C) with mica and quartz

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

Iron-stained fossiliferous rock, possibly fossil wood

Likely silicified/petrified wood in iron-rich silica matrix; exact identification requires microscopy

Petrified Wood

Silicified Wood (SiO2)

Tumbled chert or flint

Microcrystalline quartz (SiO₂), likely brown chert/flint

Chert Fossil (Pebble)

Microcrystalline Quartz (SiO2) with biogenic inclusions

Tumbled yellow calcite (probable)

Calcite — calcium carbonate, CaCO₃

Weathered iron-rich rock, likely ferruginous sandstone or lateritic concretion

Iron-oxide–cemented sandstone; commonly dominated by quartz (SiO₂), goethite (FeO(OH)) and hematite (Fe₂O₃)

Petrified Wood

Silicified Wood (SiO2)

Chert (with Calcite Veining)

Silicon Dioxide (SiO2) with Calcium Carbonate (CaCO3) veins

Jasper with Quartz Vein

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Polished fossilized wood (petrified wood), likely agatized

Silicified wood; predominantly microcrystalline quartz/chalcedony (SiO₂), with iron-oxide coloration

Cave (botryoidal) aragonite or calcite specimen

Aragonite (CaCO₃), possibly mixed with calcite and iron-oxide inclusions