Mineral (Silicate Replaced Organic Material)

Chrysoprase (Nickel-bearing Chalcedony)

Silicon Dioxide (SiO2) with traces of Hydrous Nickel Silicates

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement

Chert (Jasper)

Silicon dioxide (SiO2)

Moss Agate

Silicon Dioxide (SiO2) with mineral inclusions of hornblende or chlorite

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Mookaite Jasper

Silicified Radiolarite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Jasper and Quartz River Pebble

Silicon Dioxide (SiO2) with impurities

Moss Agate / Carnelian Agate

Silicon Dioxide (SiO2) with iron and manganese inclusions

Chert

Microcrystalline Quartz (SiO2)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Plagioclase Feldspar

NaAlSi3O8 – CaAlSi2O8 (Sodium-Calcium Aluminum Silicates)

Turquoise and Red Coral

Turquoise: CuAl6(PO4)4(OH)8·4H2O; Red Coral: Corallium rubrum (organic gemstone)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Chert (specifically Yellow/Tan Chert)

Silicon Dioxide (SiO2)

Slag (Industrial Glass/Metal)

Ferrous slag or Glassy silicate byproduct

Aquamarine

Aquamarine (Beryl variety) - Be3Al2(Si6O18)

Red Jasper

Jasper (Silicate mineral - SiO2)

Jasper

Jasper (Silicate mineral, SiO2)

Carnelian (Orange Chalcedony)

Silicon Dioxide (SiO2)

Chert (Nodule)

Silicon Dioxide (SiO2)

Chert Pebble with Quartz Veins

Microcrystalline Quartz (SiO2)

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

Coquina or Fossiliferous Limestone

Fossiliferous Calcarenite (CaCO3)

Red Jasper

Jasper (Silicon Dioxide, SiO2)

Chert (specifically Green Chert/Jasper)

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Mica Schist

Mica Schist (predominantly Muscovite or Biotite sheet silicates)

Chert (Jasper)

Microcrystalline Quartz (SiO2) with Iron Oxide inclusions

Green Moss Agate

Silicon Dioxide with inclusions (SiO2)

Tiger's Eye

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

Tiger's Eye

Tiger's eye (Pseudomorph of Quartz after Crocidolite), SiO2

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Chert Nodule (with Flint core)

Sedimentary Cryptocrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2)

Chalcedony

Chalcedony (SiO2)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Amber

Succinates (Organic compound: C10H16O)