Mineralized Fossil

Pyritized Ammonite

Ammonitida (replaced by Iron Disulfide, FeS2)

Fossil Coral

Fossilized Scleractinia or Tabulata (various genera/species)

Iron-rich sandstone or ferruginous quartzite

Quartz-rich sandstone cemented by iron oxides; possibly weakly metamorphosed quartzite

Possible basalt or iron-rich slag-like geological specimen

Basalt (tentative); predominantly plagioclase and pyroxene, possibly with magnetite/iron oxides

Biotite mica schist (probable)

Mica schist, dominated by biotite mica with quartz and feldspar; possible pyrite or other sulfides

Rounded brown river cobble

Likely iron-stained quartz-rich sandstone or weathered conglomeratic rock; exact identification requires testing

Weathered rhyolitic tuff or altered volcanic rock

Felsic volcanic tuff, likely devitrified or hydrothermally altered

Iron-rich basalt or weathered ironstone

Basalt, likely variolitic/vesicular and coated with iron oxides; composition mainly plagioclase, pyroxene, and magnetite/hematite

Weathered iron-rich basalt or volcanic rock

Fine-grained mafic rock, likely basalt with iron-oxide weathering (hematite/goethite)

Iron-rich breccia (likely hematite–goethite breccia)

Hematite (Fe₂O₃) and goethite (FeO(OH)) in a silicified or iron-cemented breccia

Dark river-worn cobble, possibly basalt or fine-grained volcanic rock

Likely basaltic rock; exact identification requires a fresh surface and tests

Brecciated quartz-rich rock, possibly silicified breccia

Silica-rich breccia; chiefly microcrystalline quartz (SiO₂), with possible calcite and iron-oxide staining

Pyrite

Iron Sulfide (FeS2)

Shark Tooth Fossil

Chondrichthyes (shark) tooth

Weathered limestone with possible fossil or calcite coating

Limestone; primarily calcium carbonate (CaCO₃), chiefly calcite

Fossiliferous limestone

Bioclastic carbonate rock, chiefly calcite (CaCO₃), containing fossil fragments—possibly coral or bryozoan

Quartz crystal cluster (likely hematoid/iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with iron-oxide staining and possible chalcedony/microcrystalline matrix

Septarian Nodule (Dragon Stone)

Septarian Concretion (Calcite, Aragonite, and Limestone/Clay)

Fossilized Gastropod Internal Mold

Gastropoda (Steinkern fossil)

Fossilized coral (likely colonial coral)

Fossil scleractinian coral; possibly *Thamnasteria* or a related coral

Fossilized Shark Tooth

Carcharodon (Galeocerdo sp. or Lamniform)

Shark Tooth Fossil

Vertebrate fossilized tooth

Fossiliferous Sandstone (with Quartz patch)

Sedimentary Sandstone with Silicified Shell Fragments

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Fossil Shell

Phylum Mollusca (Bivalvia or Brachiopoda)

Weathered fossil-bearing limestone

Limestone, predominantly calcite (CaCO₃), possibly fossiliferous or brecciated

Sandstone and Conglomerate pebbles

Sedimentary clastic rock

Fossilized Bone Fragment

Vertebrate Fossil Material (Apatite/Calcium Phosphate)

Quartz-rich hydrothermal mineral specimen, possibly vanadinite-bearing matrix

Quartz (SiO₂) with unidentified red-brown accessory minerals; exact species requires testing

Fossil Shark Tooth

Otodus sp. (likely Otodus obliquus) fossil

Fossilized Bone Fragment

Petrified Osseous Material

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Weathered mineralized rock fragment

Indeterminate; likely quartz–feldspar-rich lithic material with iron-oxide staining

Belemnite Fossil

Belemnitida (rostrum)

Weathered iron-rich sandstone or ferruginous sedimentary rock

Quartz-rich sandstone, locally cemented by iron oxides (primarily hematite/goethite)

Polished turquoise

Turquoise — hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Polished quartz vein in iron-stained host rock

Quartz (SiO₂), likely with limonite/goethite and possible feldspathic or chalcedonic matrix

Jasper and Quartz Breccia

Silica breccia (SiO2)

Fossiliferous Sandstone

Sedimentary rock containing invertebrate fossils

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Pegmatitic granite

Coarse-grained granitic rock, chiefly quartz, feldspar, and mica

Shark Tooth Fossil

Vertebrate fossilized tooth (Chondrichthyes)