Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Category
Sedimentary (Fossilized Organic Remain)
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Sandstone (Ferruginous)
Clastic Sedimentary Rock (SiO2 with Fe2O3/FeOOH cement)
sedimentary
Bituminous Coal
Coal (Sedimentary Rock)
sedimentary
Tumbled blue-green stone, likely amazonite-bearing granite or microcline
Amazonite (green microcline, KAlSi₃O₈) in a granitic host; exact identification uncertain from photo
igneous
Amber
Succinite (C10H16O)
gemstone
Yellow Quartzite (River Pebble)
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert (with Chalky Cortex)
Silicon Dioxide (SiO2)
sedimentary
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Kambaba Jasper
Stromatolite Jasper (Microcrystalline Quartz with Fossilized Cyanobacteria)
sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Porous fossil fragment (possibly fossilized coral or shell)
Unidentified fossil carbonate; likely calcite/aragonite
fossil
Mookaite Jasper
Radiolarite (SiO2)
sedimentary
Unakite (or Polished Jasper Pebble)
Altered Granite (Epidote-Orthoclase Rock)
metamorphic
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Unakite / Feldspar Veined Metamorphic Pebble
Metamorphic Rock with K-Feldspar, Epidote, and Quartz
metamorphic
Unakite
Metamorphosed Granite (Orthoclase, Epidote, Quartz)
metamorphic
Fossil Coral
Scleractinia (fossilized calcium carbonate)
sedimentary
Stromatolite
Cyanobacteria fossilized formation (CaCO3)
sedimentary
Weathered iron-stained quartzite or jasper
Quartzite dominated by quartz (SiO₂), with iron oxides/hydroxides such as hematite and limonite
metamorphic
Turquoise-and-coral silver jewelry brooch
Turquoise: hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O; red cabochons appear to be coral, likely set in silver
gemstone
Belemnoidea (Belemnite Guard)
Belemnitida (calcitic rostrum)
sedimentary
Fossilized bone
Petrified bone; commonly fossil vertebrate bone composed largely of hydroxyapatite and silica/calcite replacement minerals
fossil
Fossilized tooth, likely shark tooth
Fossilized selachian tooth; possibly a worn Otodus or related shark tooth
fossil
Unakite
Altered Granite (Epidotized Granite)
metamorphic
Botryoidal hematite (iron-oxide specimen)
Hematite, Fe₂O₃; possibly mixed with goethite/limonite
mineral
Petoskey Stone
Hexagonaria percarinata (Fossilized Coral)
sedimentary
Spinosaurus Tooth
Spinosaurus aegyptiacus (fossilized in Hydroxyapatite)
sedimentary
Belemnoit (Fossil)
Belemnoidea (Order), Rostrum / Guard
sedimentary
Sandstone
Arenite (SiO2 principal component)
sedimentary
Kambaba Jasper (Crocodile Jasper)
Stromatolitic Rhyolite/Jasper (SiO2)
sedimentary
Fossil Coral
Hexagonaria or Rugose Coral (Fossilized Calcium Carbonate / Silica)
fossil
Seashell Fragment
Calcium Carbonate (CaCO3) in the form of Aragonite or Calcite
mineral
Chert / Flint
Microcrystalline Quartz (SiO2)
sedimentary
Bivalve Fossil (Clam Shell)
Class Bivalvia
fossil
Fossilized Coral (Petoskey Stone or similar)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Fossilized Rugose Coral (Petoskey Stone precursor)
Hexagonaria percarinata (Fossilized Rugose Coral)
sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
sedimentary
Petrified Wood
Fossilized wood / Silicified wood
Sedimentary / Fossil
Baltic Amber (Butterscotch or Egg Yolk Variety)
Fossilized Tree Resin (Succinite); Approximate formula: C10H16O
Organic Gemstone (Succinite)
Ammonite Fossil
Ammonoidea
fossil
Megalodon Shark Tooth Fossil
Otodus megalodon (fossilized in sedimentary matrix)
sedimentary