Mineral (Silicate Replaced Organic Material)

Chert (with Quartz Vein)

Chert (Siliceous sedimentary rock, predominantly Microcrystalline Quartz SiO2)

Petoskey Stone

Hexagonaria percarinata (Fossilized Coral)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)

Pearl (with Peridot)

Calcium carbonate (CaCO3) + Conchiolin; Peridot: Magnesium iron silicate (Mg, Fe)2SiO4

Black Marble

Recrystallized Calcite (CaCO3)

Iolite (Cordierite)

Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18

Chert (specifically Flint)

Chert (SiO2)

Travertine

Calcareous Tufa / Travertine (CaCO3)

Turquoise, Pearl, and Coral Necklace

CuAl6(PO4)4(OH)8·4H2O (Turquoise) / CaCO3 (Pearl and Coral)

Chert (varieties include Flint and Jasper)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Olivine in Basalt (Peridot)

Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) / Scoriaceous Basalt (Host Rock)

Olivine (Peridotite)

Magnesium Iron Silicate - (Mg, Fe)2SiO4

Chert (Jasper/Common Opal mix)

Microcrystalline Quartz (SiO2)

Sodalite

Sodalite (Sodium Aluminum Silicate Chloride) - Na8(Al6Si6O24)Cl2

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Chert (with Quartz vein/coating)

Microcrystalline Quartz (SiO2)

Zebra Rock / Zebra Marble

Banded Limestone-Marble Transition

Orange Quartz with Epidote

Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate hydroxide (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Chert (specifically Blue Chert or Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Unakite

Epidotized Granite

Olivine (Peridotite)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Jasper with Quartz Vein

Silicon Dioxide (SiO2) with impurities

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

Soapstone

Steatite (composed primarily of Talc: Mg3Si4O10(OH)2)

Coquina / Limonite-stained Limestone

Sedimentary Limestone with Iron Oxyhydroxide (FeO(OH)·nH2O)

Slag (Industrial Glass Slag)

Amorphous Silicate Glass (often containing Al, Ca, Mg, and Ti oxides)

Sandstone

Arenite (SiO2 predominantly)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert Nodule (Flint)

Chert (Cryptocrystalline Silica - SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert Arrowhead (Projectile Point)

Microcrystalline Quartz (SiO2)

Shale

Fissile Clay-dominant Mudrock (SiO2, Al2O3, K2O, Na2O, CaO, MgO)

Chert (and/or Flint)

Microcrystalline Quartz (SiO2)

Tiger's Eye

Titanium-containing Quartz (Silica: SiO2)

Chert (varieties include Flint and Jasper)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Fossilized Shark Tooth

Carcharodon (Galeocerdo sp. or Lamniform)

Mother of Pearl and Onyx

Aragonite (Mother of Pearl) and Chalcedony (Onyx)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)