Minerals

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

Bay Scallop Shell

Argopecten irradians (Biogenic Calcium Carbonate / CaCO3)

Howlite

Calcium borosilicate hydroxide (Ca2B5SiO9(OH)5)

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxides

Zebra Stone (Silicified Siltstone)

Silicified Siltstone with Quartz/Kaolinite inclusions

Flower Agate

Chalcedony (SiO2) with Platy inclusions

Conglomerate

Conglomerate (clastic sedimentary rock)

Ferruginous Sandstone with Concretion

Sandstone (SiO2 dominated with Fe2O3 cement)

Ammonite Fossil

Ammonoidea (subclass)

Moss Agate

Chalcedony (SiO2) with inclusions of manganese or iron oxide

Granite Gneiss

Felsic Gneiss (composed of Quartz, Feldspar, and Biotite)

Petrified Wood

Silicified Wood (SiO2)

Fuchsite Quartzite (Green Quartzite)

Fuchsite-bearing Quartzite (K(Al,Cr)2(AlSi3O10)(OH)2 + SiO2)

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Geode with Quartz Crystal Cavity

Silicon Dioxide (SiO2) in Calcareous/Siliceous Matrix

Ferruginous Quartz (Iron-stained Quartz)

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

Specular Hematite (Specularite)

Hematite (Alpha-Fe2O3)

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Ferruginous Sandstone

Arenite with limonite/goethite cement

Banded Iron Formation (Chert/Jasper)

Banded Iron Formation (BIF)

Obsidian

Volcanic Glass (Primary composition: SiO2 - Silicon Dioxide)

Chert (Mookaite style Jasper)

Microcrystalline Quartz (SiO2) with Hematite/Goethite inclusions

Petrified Wood

Silicified wood (primarily Quartz/Chalcedony, SiO2)

Dragon Stone (Dragon Blood Jasper)

Epidote with Pietersite or Red Jasper inclusions (varied SiO2 and Ca2(Al,Fe)3(SiO4)3(OH))

Moqui Marble (Concretion)

Iron oxide concretion (Goethite/Hematite and Sandstone)

Moqui Marble (Iron Oxide Concretion)

Iron Oxide Concretion (primarily Limonite/Hematite around a Sandstone center)

Picture Jasper

Jasper (Silicon Dioxide, SiO2 with impurities)

Quartz (specifically Milky/Yellow Quartz)

Silicon Dioxide (SiO2)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Script Jasper

Silicon Dioxide (SiO2) with impurities

Conglomerate

Conglomerate (Clastic sedimentary rock)

Ironstone Concretion (Boji Stone/Moqui Marble type)

Goethite/Hematite-encrusted Sandstone Concretion

Petrified Wood

Silicified wood (primarily Silicon Dioxide, SiO2)

Blue Quartzite

Quartzite (primarily SiO2) with inclusions like Dumortierite or Magnesio-riebeckite

Rose Quartz

Quartz (Silicon Dioxide - SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Dalmatian Jasper

Aplite with Arfvedsonite inclusions

Sea Shell (Fighting Conch Fragment)

Calcium Carbonate (CaCO3) - Strombus alatus fragment

Quartzite with Iron Inclusions

Metamorphosed Quartz Sandstone (SiO2 with Fe2O3)

Chert Nodule

Microcrystalline Silica (SiO2)

Limestone (Tufa/Travertine)

Sedimentary Calcium Carbonate (CaCO3)

Geode (Unopened)

Silica-rich concretion (SiO2)