Mineral (Silicate Replaced Organic Material)

Cinnabar in Quartz

Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions

Banded Agate

Agate (Cryptocrystalline variety of Silica, SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone (likely Arkosic or Lithic)

Clastic Sedimentary Rock (SiO2 with accessory minerals)

Quartz (specifically Clear and Rose Quartz)

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Chert (specifically Gray/Blue Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Pyrite

Pyrite (Iron sulfide, FeS₂)

Sandstone

Arenite (primarily SiO2 - Silicon Dioxide)

Sandstone (Red)

Arenite (Fe2O3 heavy)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Red Shale

Lutite (primarily composed of Hydrous Aluminum Silicates with Hematite staining)

Chert (Green variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Granite Pebble

Granite (composed primarily of Quartz, Feldspar, and Mica)

Sandstone (Ferruginous)

Arenite (Fe-rich)

Milky Quartz

Silicon Dioxide (SiO2)

Chert (Flint) with Glauconite

Microcrystalline Quartz (SiO2)

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Septarian Nodule

Septarian Concretion (Complex of Calcite, Aragonite, and Limestone/Mudstone)

Septarian Nodule

Septarian Concretion (CaCO3 with Siderite/Calcite/Aragonite)

Vesicular Basalt (Scoria)

Basalt (Extrusive Igneous Rock)

Arfvedsonite in Quartz (also known as Eudialyte/Garnet Syenite variety)

Arfvedsonite [Na3(Fe2+)4Fe3+Si8O22(OH)2] within a silicate matrix

Blue Aragonite

Aragonite (Calcium Carbonate, CaCO3)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Zebra Jasper

Silicon Dioxide (SiO2) with impurities; typically a form of Chalcedony/Microcrystalline Quartz

Map Jasper (Picasso Stone)

Metamorphosed Calcium Carbonate (Crystalline Limestone or Marble with Silicate inclusions/impurities)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (often composed of Quartz, SiO2)

Mica Schist

Crystalline Schist (often primarily Muscovite or Biotite sheet silicates)

Red Sandstone

Arenite (primarily Quartz with Hematite cement)

Cloudy Quartz

Quartz (Silicon Dioxide, SiO2)

Diamond

Diamond (pure Carbon, C)

Ironstone Concretion (Limonite/Goethite)

Iron oxide concretion (contains FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Lepidolite (in Quartz Matrix)

Lepidolite [K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2]

Chert (Nodular)

Chert (SiO2 - Microcrystalline Quartz)

Chert Pebble (Jasper variety)

Microcrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based with quartz grains)