Sedimentary Or Igneous (Secondary Formation)

Banded Chert

Silicon Dioxide (SiO2)

Diamond (in jewelry)

Carbon (C)

Jasper Breccia

Brecciated Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Sandstone

Sandstone (Sedimentary rock composed of silicate grains)

Dolerite (Diabase)

Dolerite / Diabase

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Basalt

Extrusive Mafic Igneous Rock

Sandstone (likely Siltstone or fine-grained Sandstone)

Sedimentary Rock (Clastic)

Jasper (Tumbled)

Silicon Dioxide (SiO₂)

Banded Agate (specifically Lace Agate type)

Silicon Dioxide (SiO2)

Granite

Granite (a plutonic igneous rock)

Green Jasper (Agate-Jasper mixture)

Silicon Dioxide (SiO2) with impurities

Pink Dyed Agate (Pink Agate Slice)

Silicon Dioxide (SiO2) - Chalcedony / Cryptocrystalline Quartz

Copper Ore (with Azurite and Malachite)

Cuprite, Azurite (Cu3(CO3)2(OH)2), Malachite (Cu2(CO3)(OH)2)

Chert (Yellow Jasper/Flint)

Microcrystalline Quartz (SiO2)

Chert (specifically Jasper/Flint pebble)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone (with Liesegang rings or joints)

Clastic Sedimentary Rock (primarily Quartz with Iron Oxide cement)

Chert (includes Flint & Jasper)

Chert (Siliceous sedimentary rock, chemical formula SiO2)

Chert (Jasper)

Chert / Microcrystalline Quartz (SiO2)

Chert

Microcrystalline Quartz (SiO2)

Chert (Iron-stained or Jasperoid)

Microcrystalline Quartz (SiO2)

Chert (vuggy variety)

Microcrystalline silica (SiO2)

Pyrite

Iron Sulfide (FeS2)

Sandstone

Arenite (primarily SiO2)

Green Chert (Jasper)

Silicon Dioxide (SiO2)

Basalt

Basalt (Extrusive Mafic Igneous)

Botryoidal Goethite on Quartz

Goethite (α-Fe3+O(OH)) on Quartz (SiO2)

Orange Calcite (Dogtooth/Cluster)

Calcium Carbonate (CaCO3)

Granite

Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Granite

Granite (Felsic Plutonic Rock)

Greenstone

Greenschist (composed of actinolite, chlorite, and epidote)

Basalt

Basalt (Mafic volcanic rock, primarily Plagioclase and Pyroxene)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Lapis Lazuli

Lapis Lazuli (a rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2, with varying amounts of Calcite, Pyrite, and Sodalite).

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Granite (weathered pebble)

Granite (plutonic igneous rock)

Limonite-stained Quartz / Quartzite

Silicon Dioxide (SiO2) with iron hydroxides (FeO(OH)·nH2O)

Chert (and Fossilized Brachiopod shell)

Sedimentary Cryptocrystalline Quartz (SiO2)

Chert (often called Jasper or River Siltstone)

Microcrystalline Quartz (SiO2)

Chert (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Jasper)

Microcrystalline Quartz (SiO2)