Shale (or Mudstone)
Siltstone/Argillite (composed mainly of clay and silt-sized particles)
sedimentary
Category
Igneous And Fossil
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Sandstone (likely Fossiliferous Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Chert Nodule)
Silicon Dioxide (SiO2)
sedimentary
Shale
Lutaceous sedimentary rock
sedimentary
Banded Sandstone
Arenite with iron oxide banding
sedimentary
Red Sandstone
Arenite (with Iron Oxide)
sedimentary
Chert (River Pebble)
Chert (Microcrystalline Silicon Dioxide, SiO2)
sedimentary
Sandstone (likely Arkosic or Lithic)
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Coquina
Coquina Limestone (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (Red/Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Sandstone (Ferruginous)
Arenite with Iron-Oxide Cement
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone
Sedimentary rock composed of Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone (with Lichen)
Arenite (primarily SiO2)
sedimentary
Anthracite Coal
Anthracite (high-rank coal / Carbon)
metamorphic
Coal (most likely Bituminous or Anthracite)
Coal (organic sedimentary rock)
Sedimentary
Fossilized Coral (Favosites)
Favosites goldfussi / Tabulata
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Ironstone Concretion (likely)
Goethite/Hematite/Limonite cemented sediment
Sedimentary Rock
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite (Resin C10H16O)
mineral
Amber
Succinite (Fossilized Tree Resin)
mineral
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pyrite
Pyrite (FeS2)
Mineral
Stromatolite
Laminated biogenic sedimentary structure (Cyanobacteria)
sedimentary
Shale
Fissile mudstone (Shale)
sedimentary
Concretion
Various mineral compositions, typically carbonate or iron oxide cemented sediment
Sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily Quartz with Fe2O3 staining)
sedimentary
Gastropod Fossil (Snail Stone or Steinkern)
Class Gastropoda (Calcium Carbonate - CaCO3 / Silica - SiO2 replacing original shell)
sedimentary
Fossil Coral (likely Favosites or Honeycomb Coral)
Class Anthozoa, Order Tabulata, Genus Favosites
sedimentary
Chert (Vuggy or Fossilliferous)
Microcrystalline Quartz (SiO2)
sedimentary
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Bivalve Fossil (Internal Mold)
Class Bivalvia (Phylum Mollusca)
sedimentary
Fossil Coral (Rugose Coral)
Rugosa (extinct order); typically composed of Calcite (CaCO3) or replaced by Quartz (SiO2)
sedimentary
Agatized Fossil or Chalcedony Nodule
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Petrified Wood (Silicified Fossil)
Silicified Wood (SiO2)
sedimentary