Mineral (Silicate Replaced Organic Material)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Chert (specifically Flint or Jasper variant)

Microcrystalline or Cryptocrystalline Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Tumbled Green Jasper

Silicon Dioxide (SiO2) with mineral inclusions

Eudialyte in Matrix

Eudialyte [Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2]

Chert (Field Stone)

Microcrystalline / Cryptocrystalline Quartz (SiO2)

Chert (Nodule)

Chert (SiO2)

Epidote in Granite Gneiss

Epidote bearing Orthogneiss (Ca2(Al,Fe)3(SiO4)3(OH))

Banded Chert (Jasper)

Silicon Dioxide (SiO2)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Rhodonite

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

Chert (variously identified as Flint)

Microcrystalline Quartz (SiO2)

Flint

Chert (a form of cryptocrystalline quartz, chemical formula SiO₂)

Blue Quartz (Aventurine)

Silicon Dioxide (SiO2) with inclusions of Dumortierite or Magnesio-riebeckite

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and clay inclusions

Lepidolite and Rubellite (Pink Tourmaline) in Quartz

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite) and Na(Li,Al)3Al6(BO3)3Si6O18(OH)4 (Elbaite/Pink Tourmaline)

Chert (variously identified as Flint)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Chert (Smooth River Pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Tiger's Eye (dark/grey variant)

Pseudomorph of Quartz after Crocidolite (SiO2)

Tiger's Eye

Silicon Dioxide (SiO2)

Chert (Nodular or Massive Variety)

Cryptocrystalline Quartz (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Amber

Succinite (C10H16O)

Fuchsite

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Fulgurite

Fulgurite (Lechatelierite-rich variety)

Fossiliferous Shale Matrix

Clastic Sedimentary Rock with Brachiopod or Mollusk shell fragments

Limonite with Iron Inclusions

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

Chert / Flint Nodules in Limestone

Silicon Dioxide (SiO2) within Calcium Carbonate (CaCO3)

Amazonite

KAlSi3O8 (Potassium Aluminum Silicate)

Chert (Jasper focus)

Silicon dioxide (SiO2) - Microcrystalline Quartz

Sandstone

Sandstone (clastic sedimentary rock, composed predominantly of sand-sized minerals or rock fragments)

Tiger's Eye (Rough)

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Ferruginous Sandstone (Ironstone)

Sedimentary rock with Limonite/Goethite cement

Chert (specifically Flint or Novaculite variant)

Chert (Microcrystalline Quartz, SiO2)

Red Jasper

Microcrystalline Quartz (SiO2) with Hematite impurities

Travertine

Calcareous Tufa (CaCO3)

Dyed Dalmatian Jasper (Dalmatian Stone)

Perthitic Feldspar with Arfvedsonite inclusions

Chert (Jasper/Flint variety)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Chert (Yellow Jasper variant)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Amber

Succinite (organic hydrocarbon)