Sedimentary (Man Made Composite)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Pyrite

Pyrite (Iron Disulfide), FeS2

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Chalk (Limestone variant)

Calcium Carbonate (CaCO3)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Travertine

Terrestrial Sedimentary Form of Calcium Carbonate (CaCO3)

River Cobble (Quartzite-rich Sandstone)

Clastic Sedimentary Rock (Litharenite/Quartzite transition)

Fossiliferous Limestone with Crinoid stems

Calcite-rich Biogenic Sedimentary Rock (CaCO3)

Oolitic Ironstone

Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)

Wood Jasper

Siliceous sedimentary rock (variety of Chert/Chalcedony)

Chalk (Calcitic)

Calcium Carbonate (CaCO3) - Biogenic Sedimentary Rock

Chert (variations include Flint or Jasper)

Chert (chemical sedimentary rock), Quartz (SiO2)

Conglomerate

Clastic Sedimentary Conglomerate (SiO2, CaCO3, etc.)

Ironstone (likely Ferruginous Siltstone/Sandstone)

Ferruginous sedimentary rock (FeOx-rich clastic)

Bituminous Coal

Organic-rich sedimentary rock (Complex hydrocarbons)

Brecciated Chert

Sedimentary Chert (SiO2) with Calc-Silicate mineralization

Microcrystalline Limestone Pebble

Carbonate sedimentary rock (Calcium Carbonate, CaCO3)

Shale

Fissile Mudrock (Clay-rich Sedimentary Rock)

Anthracite Coal

Anthracite (Carbon-rich metamorphic sedimentary rock)

Red Sandstone (Hematitic)

Clastic sedimentary rock (SiO2 with Fe2O3 inclusions)

Mookaite Jasper

Siliceous (chert) sedimentary rock, a form of Jasper

River Stone (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock (Lithic Wacke / Siltstone)

Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)

Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)

Red Sandstone

Clastic sedimentary rock (primarily SiO2 with Fe2O3)

Ironstone (Limonitic Shale)

Ferruginous Siltstone / Goethite-rich Sedimentary Rock

Banded Sandstone (Liesegang Rings)

Sedimentary Arenite (SiO2 with FeO/Fe2O3 impurities)

Sandstone Concretion

Sandstone (Sedimentary Rock) with silica or calcite cement

Fossilized Coral (Petoskey Stone or Rugose Coral)

Antophyllum (Hexagonaria) or Scleractinia (CaCO3)

Honey Calcite

Calcium Carbonate (CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Glauconitic Sandstone (Greensand)

Glauconitic Quartz Arenite (containing Glauconite, (K,Na)(Fe3+,Al,Mg)2(Si,Al)4O10(OH)2)

Brecciated Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Greywacke

Dirty Sandstone (Lithic wacke)

Map Jasper (Grey Picasso Jasper)

Silicon Dioxide (SiO2) with impurities

Sandstone

Quartz Arenite (a common type of sandstone, given the appearance), Arkose, Greywacke (depending on mineralogy)

Shale (with minor calcite veining)

Clastic sedimentary rock (primarily clay minerals and quartz)

Blue Chalcedony

Silicon Dioxide (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Grey Limestone Pebble

Limestone (Calcium Carbonate - CaCO3)

Optical Calcite (Iceland Spar)

Calcite (Calcium Carbonate, CaCO3)

Hematite

Iron(III) oxide (Fe2O3)

Hematite (Iron Ore)

Hematite (Fe2O3)