Metamorphic Rock (Primarily Composed Of Minerals)

Orange Quartz

Crystalline Silicon Dioxide (SiO2) with iron oxide inclusions

Staurolite

Staurolite (Fe2+2Al9Si4O23(OH))

Petrified Wood

Silicified Wood (SiO2 - Silicon Dioxide)

Granite

Granite (Mainly Quartz, Alkali Feldspar, and Plagioclase)

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Unakite

Epidotized Granite

Yellow Quartz Pebble

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Diorite

Diorite (Intermediate intrusive igneous rock)

Magnetite (Lodestone)

Magnetite (Fe3O4)

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

Aphanitic mafic volcanic rock with secondary mineral inclusions (e.g., CaAl2Si3O10·3H2O for Scolecite)

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Blue Quartzite

Quartzite with inclusions (SiO2)

Granite

Phaneritic plutonic rock (primarily Quartz, Feldspar, and Mica)

Bumblebee Jasper

Hydrothermal Volcanic Rock (Primarily Calcite with Orpiment - As2S3, Realgar, and Pyrite)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Limonitic Quartzite

Metamorphosed sandstone with Limonite (FeO(OH)·nH2O) staining

Vesicular Basalt (Amygdaloidal)

Amygdaloidal Basalt (Mafic volcanic rock)

Basalt (Greenstone)

Amygdaloidal Basalt / Chloritized Basalt

Clear Quartz

Silicon dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Sandstone (Greywacke/Lithic Sandstone)

Arenite / Lithic Sandstone

Sandstone Concretion

Clastic sedimentary rock (primarily Silica, SiO2, or Calcium Carbonate, CaCO3)

Diorite

Diorite (intermediate intrusive igneous rock)

Quartzite

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartzite Pebble

Quartzite (primarily SiO2)

Iron-Stained Quartz (Riverside Cobble)

Silicon Dioxide (SiO2) with Limonite/Hematite inclusions

Granite

Phaneritic Plutonic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Petrified Wood

Silicified Wood (primarily SiO2)

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Coral Fossil (Petrified Coral)

Scleractinia (Order) - Calcified Fossil Skeleton (CaCO3)

Bornite (Peacock Ore)

Bornite (Cu5FeS4)

Lapis Lazuli

Complex mixture containing Lazurite ((Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2), Calcite, and Pyrite

Pumice (Volcanic Rock)

Vesicular volcanic rock (composed largely of amorphous volcanic glass)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Chert / Flint Conglomerate

Silicified Sedimentary Breccia (primarily SiO2)