Sedimentary (Biogenic Sediment Or Biological Remain)

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Petrified Wood

Silicified Wood (SiO2)

Fossiliferous Chert (Chert with Crinoid Stem Impression)

Chert (SiO2) with fossil Anthozoan or Crinoid columnals

Greywacke with Quartz Vein

Greywacke (immature sandstone) with SiO2 inclusions

Graywacke

Graywacke Sandstone (C6H10O5)x - predominantly quartz and feldspar

Petrified Wood

Silicified Wood (SiO2)

River Rock (Mossy)

Stream-rounded Clast (likely Siltstone or Sandstone with bryophytes)

Weathered iron-rich concretion or laterite fragment

Ferruginous concretion, likely goethite/limonite (hydrated iron oxides) in a clay-rich matrix

Weathered jasper/chert nodule

Microcrystalline quartz (SiO₂), likely iron- and clay-stained jasper or chert

Jasper Pebble

Jasper (Silicon Dioxide, SiO2)

Banded Jasper

Microcrystalline Quartz (SiO2) with iron inclusions

Yellow Jasper

Cryptocrystalline Quartz (SiO2) with Goethite/Limonite inclusions

Petrified Wood

Silicified Wood (primarily SiO2)

Ironstone Concretion

Goethite-rich Siltstone / Siderite (FeCO3)

Yellow Jasper

Silicon Dioxide (SiO2) with high iron inclusion

Bumblebee Jasper

Calcite-bearing Volcanic Tuff containing Sulfur and Arsenic (Orpiment/Realgar)

Petoskey Stone (Fossilized Coral)

Hexagonaria percarinata

Petrified Wood

Silicon Dioxide (SiO2) - Calcified / Silicified Wood

Petrified Wood

Silicified Wood (SiO2)

Calamites

Calamites (Pith cast fossil)

Limonite Concretion (Goonie or Rattlestone)

Limonite (FeO(OH)·nH2O)

Gastropod Steinkern (Fossilized Snail Cast)

Phylum Mollusca, Class Gastropoda (Commonly CaCO3 or SiO2 after replacement)

Fossilized Brachiopod or Gastropod

Phylum Brachiopoda / Phylum Mollusca

Shale or Mudstone (Based on appearance)

Shale (fine-grained, laminated fissile sedimentary rock) / Mudstone (fine-grained, non-fissile sedimentary rock)

Iron-rich concretion or weathered ironstone

Goethite–hematite limonite aggregate; commonly described as limonite or ironstone

Tumbled jasper (likely picture jasper or iron-rich jasper)

Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides

Echinoid Fossil (Fossilized Sea Urchin)

Echinoidea

Pitted Limestone

Calcium Carbonate (CaCO3)

Jasper (likely Polychrome or Mookaite variants)

Silicon Dioxide (SiO2) with iron oxide and hydroxide inclusions

Chert / Flint

Microcrystalline quartz (SiO2)

Belemnoidea (Belemnite Guard)

Belemnitida (calcitic rostrum)

Siltstone Pebble

Siltstone (composed of hydraulic-sorted silt-sized particles)

Glauconitic Sanstone (Glauconite)

Glauconite ((K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2)

Fossilized Shark Tooth

Scapanorhynchus (Sand Tiger Shark relative)

Sandstone with Trace Fossils

Quartz Arenite with Bioturbation (Trace Fossils)

Bumblebee Jasper (technically a type of Agate/Anhydrite)

Calcite and Anhydrite with inclusions of Realgar and Orpiment (As2S3)

Conglomerate

Conglomerate (clastic sedimentary rock)

Polished chert or jasper cobble

Microcrystalline quartz (SiO₂), commonly called chert; iron-oxide-bearing varieties are jasper

Chert Nodules (with Flint core)

Microcrystalline Quartz (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (primarily SiO2)

Tumbled brown stone, likely jasper or chert

Microcrystalline quartz (SiO₂), probably iron-stained jasper/chert

Red Coral

Corallium rubrum (Calcium Carbonate, CaCO3)