Bivalve Fossil (Shell Fragment)
Class Bivalvia (Calcium Carbonate - CaCO3)
sedimentary
Category
Igneous And Fossil
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Favosites Fossil (Honeycomb Coral)
Favosites sp. (Extinct genus of tabulate coral)
sedimentary
Echinoidea (Fossil Sea Urchin)
Echinodermata Echinoidea
sedimentary
Cockle Shell (Fossil or Recent)
Class Bivalvia, Family Cardiidae (e.g., Cerastoderma edule for common cockle)
Sedimentary (Biogenic, a type of fossil)
Ironstone Concretion
Goethite-rich Siltstone / Siderite (FeCO3)
sedimentary
Shale with Iron Oxide Staining
Fissile Mudstone (primarily clay minerals and quartz)
sedimentary
Slag Glass
Amorphous Silicate (Man-made)
industrial byproduct
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limestone with fossiliferous textures
Bioclastic Limestone (CaCO3)
sedimentary
Limestone
Sedimentary rock composed primarily of Calcium Carbonate (CaCO3)
sedimentary
Chert (River Pebble)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone or Siltstone
Arenite (if sandstone)
Sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Biogenic Inclusions
sedimentary
Amber
Succinicum (Organic polymer, largely C10H16O)
Organic Mineral
Amber
Succinicum (Succinite); C10H16O
Mineraloid (Organic)
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Chert (specifically Blue Chert/Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (with Iron Oxide cement)
sedimentary
Limestone
Sedimentary rock primarily composed of Calcite (CaCO3)
sedimentary
Limestone Pebble
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Limonite pseudo-concretion (Ironstone)
Limonite (FeO(OH)·nH2O) / Goethite
sedimentary
Ironstone Concretion
Ironstone (Limonite/Goethite Concretion)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert Nodules (with Quartz Inclusions)
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Ironstone Concretion
Siderite or Hematite Concretion (FeCO3 or Fe2O3)
sedimentary
Siltstone with Concretion
Siltstone (composed of hydraulic silicates and quartz particles)
sedimentary
Milky Quartz with Dendritic Inclusions
Silicon Dioxide (SiO2)
mineral
Red Shale
Lutite (primarily composed of clay minerals and iron oxides like hematite, Fe2O3)
sedimentary
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
Red Sandstone
Clastic Sedimentary Mineraloid (predominantly Quartz grains with Iron Oxide cement)
sedimentary
Limonite Concretion (Goonie or Rattlestone)
Limonite (FeO(OH)·nH2O)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Sandstone
Arenite (Clastic Sedimentary Rock)
sedimentary
Coquina or Fossiliferous Limestone
Fossiliferous Limstone (CaCO3)
sedimentary
Sandstone
Arenite (SiO2 primarily)
sedimentary
Limestone with Quartz/Calcite Veins
Sedimentary Limestone (CaCO3 with SiO2 or CaCO3 intrusions)
sedimentary
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary