Metamorphic Or Sedimentary Depending On Local Grade

Limestone (specifically Tufa or Travertine)

Calcium Carbonate (CaCO3)

Limonite Concretion (Ironstone)

Limonite (Hydrated Iron(III) Oxide-Hydroxide, FeO(OH)·nH2O)

Blue Chalcedony

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Conglomerate

Clastic sedimentary rock (Conglomerate)

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities

Ruby in Kyanite

Corundum in Disthene (Al2SiO5 + Al2O3)

Siltstone

Siltstone (primarily composed of microcrystalline Quartz and Feldspar)

Ironstone (Limonitic Concretion)

Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Flint / Chert

Silicon dioxide (SiO2)

Lapis Lazuli

Lazurite (primary mineral component), (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron Oxide inclusions)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Mica Schist

Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)

Agate (specifically Carnelian Agate or Lake Superior style Agate)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Leopard Skin Jasper

Rhyolite (Silicon Dioxide with impurities), SiO2

Pyrite

Iron Sulfide (FeS2)

Emerald (Tumbled Beryl)

Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities

Chalcedony Nodule in Matrix

Silicon Dioxide (SiO2)

Chert (specifically Jasper/Brown Chert)

Silicon Dioxide (SiO2)

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Lapis Lazuli

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Charoite

Charoite (K(Ca,Na)2Si4O10(OH,F)·H2O)

Lapis Lazuli

Na8[Al6Si6O24]n(S,Cl,SO4,OH)2

Quartzite (River Cobble)

Quartzite (SiO2)

Dendritic Agate / Moss Agate

Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions

Picture Jasper

Silicified sedimentary or volcanic rock (primarily SiO2)

Dragon Stone

Argillaceous Sedimentary Rock (Ohko Stone)

Fossilized Sand Tiger Shark Tooth

Carcharias taurus / Striatolamia macrota (mineralized as Hydroxylapatite/Francolite)

Conglomerate

Conglomerate (Sedimentary rock)

Botryoidal Chalcedony (likely Desert Rose/Agatized Geode Crust)

Silicon Dioxide (SiO2)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Yellow Ocher (Limonite)

Limonite (Hydrated Iron Oxide) - FeO(OH)·nH2O

Sandstone

Sandstone (arenite is a more specific geological term for a clean sandstone, while wacke refers to a dirty sandstone with significant matrix)

Moonstone

Orthoclase (Potassium Aluminum Silicate), Formula: (K,Na)AlSi3O8

Jadeite Jade

Jadeite (Sodium Aluminum Silicate, NaAlSi₂O₆)

Serpentine (Serpentinite)

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4