Organic (Sedimentary Context)

Red Jasper

Silicon Dioxide with Hematite inclusions (SiO2 + Fe2O3)

Chert / Flint (with Jasper inclusions)

Microcrystalline Quartz (SiO2)

Galena

Lead(II) sulfide (PbS)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Pyrite (Iron Pyrites)

Iron Sulfide (FeS2)

Red Jasper

Silicon Dioxide (SiO2) with iron inclusions

Likely calcite-rich limestone or marble

Calcite (CaCO₃); possibly recrystallized limestone (marble)

Hematite (Iron Ore Boulder)

Hematite (Fe2O3)

Quartzite

Quartzite (SiO2)

Marble

Recrystallized Carbonate Rock (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Pyrite

Iron Disulfide (FeS2)

Quartzite

Quartzite (primarily SiO2)

Chert (often called Flint or Jasper)

Silicon Dioxide (SiO2)

Chert (Flint)

Chert (SiO2)

Chert/Flint

Silicon dioxide (SiO2)

Chert (Flint/Novaculite)

Microcrystalline Quartz (SiO2)

Chert

Microcrystalline silica (SiO2)

Marble

Recrystallized Calcite (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Epidote

Epidote; Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Marble (Carrara style)

Recrystallized Calcite-rich Metamorphic Rock (CaCO3)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Specular Hematite

Specularite (Fe2O3)

Red Jasper with Quartz Vein

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Sulfide (FeS2)

Pyrite

Iron Disulfide (FeS2)

Magnetite

Magnetite (Fe3O4)

White Marble

Recrystallized Calcite (CaCO3)

Marble

Metamorphosed Limestone (principally CaCO3)

Pyrite

Iron Sulfide (FeS2)

Hematite

Iron(III) oxide (Fe2O3)

Chert / Jasper Pebble

Microcrystalline Quartz (SiO2)

Chert / River Jasper

Microcrystalline Quartz (SiO2)

Yellow Calcite

Calcium Carbonate (CaCO3)