Mineralized Fossil

Murex Fossil

Muricidae (Calcium Carbonate fossilization)

Polished dendritic agate cabochon

Microcrystalline quartz (chalcedony), SiO₂, with iron/manganese dendrites and possible plume inclusions

Vesicular basalt (possibly weathered scoria)

Basaltic volcanic rock; chiefly plagioclase, clinopyroxene, and Fe–Mg oxides, with vesicles from trapped gas

Conglomeratic breccia (possibly polymictic volcanic breccia)

Polymictic breccia; clasts in a fine-grained volcanic or sedimentary matrix

Worn River Pebble with Fossil Indentation

Sedimentary Rock with Fossil Infill

Likely tumbled or polished fossil shell

Fossilized mollusk shell; exact species cannot be determined from this image

Weathered limestone

Calcite-rich limestone (CaCO₃), possibly fossiliferous

Pyrite

Iron Sulfide (FeS2)

Weathered fossiliferous limestone pebble (possible fossil fragment)

Calcite-rich limestone, primarily CaCO₃; the visible lines may be calcite-filled fractures

Crinoid Stem Fossil

Crinoid columnal (Echinodermata)

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Weathered jasper-rich breccia

Silicified iron-rich breccia; primarily microcrystalline quartz (SiO₂) with iron oxides/hydroxides

Polished septarian nodule

Calcite–aragonite–barite septarian concretion, commonly in a claystone or limestone matrix

Fossil Coral

Phylum Cnidaria / Rugosa or Tabulata

Iron-stained quartz vein rock

Quartz (SiO₂), with iron-oxide minerals such as hematite and goethite

Fossiliferous limestone

Bioclastic limestone, containing a fossil shell or coral fragment

Petrified Coral (Agatized Coral)

Anthozoa (Agatized Fossil)

Pyrite

Iron Sulfide (FeS2)

Shark Tooth Fossil

Elasmobranchii fossil (likely Carcharias or Odontaspis sp.)

Copper-bearing Quartz (likely Chrysocolla or Malachite staining)

Cuprite, Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O) or Malachite staining on Quartz/Host Rock

Rounded greenish-gold rock or mineral pebble

Indeterminate; possibly serpentine-rich stone, weathered sulfide, or iron-stained metamorphic rock

Sandstone

Arenite

Polished fossiliferous limestone, possibly ammonite-bearing

Calcite-rich limestone (CaCO₃), with visible fossil or shell fragments

Fossiliferous limestone, likely stromatolitic or bioclastic limestone

Calcite-rich carbonate rock; predominantly CaCO₃ (calcite), with possible siliciclastic impurities and fossil structures

Limonite Concretion

Limonite (Hydrated iron(III) oxide-hydroxides, FeO(OH)·nH2O)

Fossilized Shark Tooth

Chondrichthyes (Class)

Weathered sulfide-bearing rock, likely pyrite-rich schist or quartzite

Quartz–mica rock with disseminated pyrite (FeS₂), possibly altered schist

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-veined metamorphic rock, chiefly SiO₂ with iron-oxide staining

Banded Agate (Onyx type)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Ironstone Concretion

Siderite or Limonite Concretion (FeCO3 or FeO(OH)·nH2O)

Quartz vein rock with iron-oxide staining

Massive and drusy quartz (SiO₂), with hematite/goethite and likely minor sulfides

Fossilized Shark Tooth (Megalodon or Carcharocles species fragment)

Otodus megalodon / Carcharocles spp. (Apatite / Calcium Phosphate)

Fossiliferous limestone with a shell fossil

Calcite-rich limestone (primarily CaCO₃), containing a likely fossil shell

Fossilized Shark Tooth

Chondrichthyes (Class) - likely Carcharodon or Otodus genus

Fossil Shark Tooth

Carcharodon sp. (likely Otodus or similar Lamniformes order)

Fossil Shell

Phylum Mollusca (Gastropod fossil)

Fossiliferous limestone pebble

Calcite-rich limestone (mainly CaCO₃), containing marine shell fossils

Iron-stained quartz-rich metamorphic rock (probable quartzite or hydrothermal vein rock)

Quartz-dominant rock; chiefly SiO₂, with iron oxides/hydroxides and minor sulfide minerals

Fossil oyster shell

Oyster (family Ostreidae), preserved as calcite/aragonite shell

Milky quartz vein fragment

Quartz (silicon dioxide, SiO₂), likely with iron-oxide staining and minor host rock

Iron-stained quartz (likely quartz-rich vein rock)

Quartz, SiO₂, with iron-oxide/hydroxide staining (limonite/goethite)

Tumbled rhodonite

Rhodonite, manganese inosilicate (MnSiO₃), commonly mixed with quartz and manganese oxides