Sedimentary (Secondary Formation)

Sandstone (lithic wacke)

Arenite / Lithic Wacke (mostly SiO2 with rock fragments)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone

Arenite (primarily SiO2)

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)

Limestone (Ocherous)

Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)

Red Sandstone

Arenite (primarily Quartz, SiO2, with Iron Oxide cementing agent)

Red Sandstone

Arenite with Hematite (Fe2O3) cement

Coal (specifically Bituminous or Anthracite)

Organic sedimentary rock; primarily Carbon (C) with varying H, S, O, N

Milky Quartz

Silicon Dioxide (SiO2)

Jasper

Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (primarily SiO2)

Native Copper

Native Copper (Cu)

Turquoise

CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)

White Agate (Chalcedony)

Silicon Dioxide (SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Banded Agate (Dyed Purple)

Agate (Variety of Chalcedony/Quartz), SiO2

Banded Chert

Microcrystalline Quartz (SiO2)

Microcrystalline Limestone Pebble

Carbonate sedimentary rock (Calcium Carbonate, CaCO3)

Petoskey Stone

Hexagonaria percarinata

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Magnetite (Lodestone variety)

Magnetite (Fe3O4)

Optical Calcite (Iceland Spar)

Calcium Carbonate (CaCO3)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Dendritic Agate (specifically Orange/Tumbled)

Silicon Dioxide (SiO2) with Oxide Inclusions

Ferruginous Quartzite (Chert)

Quartzite with Iron inclusions (SiO2 + Fe2O3)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (Ferruginous)

Arenite (with iron oxide cement, Fe2O3)

Limestone

Calcium Carbonate (CaCO3)

Banded Iron Formation

Banded Iron Formation (BIF)

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Limonite (Ironstone)

Limonite (FeO(OH)·nH2O)

Quartz (Druzy)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lazurite-dominant rock, (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2

Jasper (Cream/Yellow variety)

Silicon dioxide (SiO2)

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Yellow Jasper (Chalcedony)

Silicon Dioxide with Iron inclusions (SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Tree Agate

Dendritic Agate (Silicon Dioxide, SiO2)