Igneous And Fossil

Crinoid Stem Fossil

Crinoida (columnal ossicles)

Bivalve Fossil (Clam Shell)

Class Bivalvia

Bivalve Fossil (Mussel or Clam Shell)

Bivalvia

Spinosaurus fossil (permineralized bone)

Spinosaurus aegyptiacus (Calcium phosphate mineralized with silica/sediment)

Fossilized Shark Tooth

Fossil Chondrichthyes (various genera such as Carcharias or Odontaspis)

Fossil Plant Impression (Calamites)

Calamites sp. (Tracheophyta: Equisetopsida)

Gastropod Internal Mold (Steinkern)

Class Gastropoda fossil mold (Phylum Mollusca)

Weathered sandstone

Quartz-rich sandstone, chiefly SiO₂ with feldspar and lithic grains

Silicified Gastropod Fossil (Agatized Fossil)

Gastropoda (Class) preserved in Chalcedony/Quartz (SiO2)

Fossiliferous limestone (likely ammonite/gastropod-bearing)

Bioclastic limestone; predominantly calcite (CaCO₃)

Weathered vesicular volcanic rock (likely vesicular basalt or scoria)

Vesicular basalt; primarily plagioclase, pyroxene, and iron-rich oxides, with possible glass

Weathered quartz-rich rock, possibly granite or quartzite

Indeterminate; likely quartz–feldspar aggregate, possibly granitic gneiss

Pyrite

Iron Sulfide (FeS2)

Likely weathered quartz-bearing rock

Indeterminate; possibly quartz-rich granite or granitic pegmatite

Dark igneous rock, likely basalt or diabase, with a second purplish specimen

Basalt/diabase; exact identification is uncertain from the photograph

Fossilized Shell

Invertebrate fossil (Bivalvia or Brachiopoda)

Mosasaur Tooth Fossil

Mosasaurid vertebrate fossil (Hydroxyapatite)

Crinoid Fossil Fragment

Crinoidea (echinoderm fossil embedded in limestone/matrix)

Tumbled vesicular basalt

Vesicular basalt, primarily plagioclase, clinopyroxene, olivine, and volcanic glass

Mica-rich granite or granitic pegmatite

Quartz–feldspar–mica aggregate, commonly biotite granite or muscovite-bearing pegmatite

Vesicular basalt (scoria-like lava rock)

Basalt, predominantly plagioclase + pyroxene ± olivine; vesicles formed by trapped volcanic gas

Orbicular granite (likely larvikite/rapakivi-type granite)

Granite; chiefly quartz, alkali feldspar, plagioclase, with dark biotite/amphibole and iron-oxide veining

Iron-rich rock or Concretion

Ironstone or Limonite concretion

Petrified Wood

Petrified Wood (Silicified Wood)

Banded Chalcedony (Agate) in Basalt Matrix

Cryptocrystalline Quartz (SiO2) in Mafic Igneous Rock

Earth

Terra / Earth

Quartz-rich pegmatite fragment

Granite/pegmatite; chiefly quartz (SiO₂) and feldspar, with possible biotite or tourmaline

Granite

Granite; primarily quartz (SiO₂), feldspar, and mica

Pink granite (weathered, rounded cobble)

Granite; predominantly quartz, potassium feldspar, plagioclase, and mica/amphibole

Fossiliferous Limestone

Bioclastic Limestone (Calcium Carbonate, CaCO3)

Sandstone Pebble

Sedimentary Rock (Quartzose Sandstone)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Rounded granite or granitic gneiss pebble

Granite; chiefly quartz, feldspar, and mica

Fossil shell

Likely a fossilized marine bivalve shell; exact taxon is indeterminate from the image.

Fossil Coral

Rugose Coral / Hexagonaria (CaCO3)

Likely weathered granite or granitic pegmatite fragment

Granite; chiefly quartz, feldspar, and minor mica (exact identification uncertain from the image)

Fossiliferous Sandstone

Sedimentary rock containing invertebrate fossils

Fossiliferous Sedimentary Rock

Sedimentary Rock with Invertebrate Fossil Imprint

Orbicular gabbro (likely oceanic orbicular rock)

Orbicular gabbro, composed chiefly of plagioclase feldspar and pyroxene, with concentric orbicules

Weathered basaltic volcanic rock

Basalt, likely vesicular/amygdaloidal basalt

Bivalve Seashell Fossil

Class Bivalvia

Sandstone with Trace Fossils

Quartz Arenite with Bioturbation (Trace Fossils)