Organic Material (Likely A Fruit Or Berry)

Chert (Arrowhead or Projectile Point)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tumbled amber-colored pebble

Likely quartz/chert or iron-stained chalcedony; exact identification requires testing

Fossil bivalve shell

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

Fossil-bearing ironstone or weathered concretion

Indeterminate; likely ferruginous sandstone/concretion containing a partial fossil impression

Beach sandstone or cemented beachrock fragment

Lithified carbonate- or silica-rich sand; commonly calcarenite or quartz sandstone

Chert (Nodule/Pebble)

Chert (Silicon Dioxide, SiO2)

Fossilized Wood (Petrified Wood)

Agatized wood (primarily SiO2)

Chert (specifically a nodule with Chalcendony/Agate banding)

Microcrystalline Quartz (SiO2)

Fossiliferous shale or slate with plant impressions

Carbonaceous mudstone/shale; possible fossil plant material (often fern-like impressions)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (Quartz replacement, SiO2)

Fossilized coral or stromatoporoid fragment

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

Polished amber-like agate or jasper carving

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

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Iron-stained quartz-rich rock, possibly jasper or chert

Microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Fossil mammalian skull

Fossilized vertebrate bone; exact taxon cannot be determined from the image

Fossilized tooth, likely shark tooth

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

Possible fossilized shell or coral fragment

Indeterminate biogenic carbonate, likely calcite (CaCO₃)

Chert (likely flint)

Microcrystalline quartz, SiO₂ (chalcedony/quartz aggregate)

Chert (Jasper-rich)

Microcrystalline/Cryptocrystalline Quartz (SiO2)

Coquina (Fossiliferous Limestone)

Coquina (Organic Clastic Limestone)

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

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Possible flint or black chert

Microcrystalline quartz (SiO₂), likely chert/flint

Possible fossilized bone or tooth fragment

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

Likely tumbled yellow calcite or limestone fragment

Calcite (CaCO₃), possibly micritic limestone

Tumbled amber (likely)

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

Petrified Wood

Silicified wood (Quartz/Chalcedony/SiO2)

Coal (likely bituminous coal)

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

Petrified Wood

Silicified Wood (primarily SiO2)

Petrified Wood

Fossilized Xylem (SiO2)

Sandstone (likely Fossiliferous Sandstone)

Clastic sedimentary rock (primarily SiO2)

Chert (Agatized/Chalcedony variety)

Microcrystalline Quartz (SiO2)

Jasper

Jasper (Silicon Dioxide, SiO2)

Fossilized Wood

Petrified Wood (Silicified Wood)

Petrified Wood

Silicified wood (SiO2)

Petrified Wood

Silicified Wood (SiO2)

Petrified Wood

Silicified wood (SiO2)

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

Chert (Jasper variety)

Microcrystalline Quartz (SiO2)