Mineralological Specimen

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert Nodule in Limestone

Chert (Microcrystalline Quartz, SiO2) and Limestone (Calcium Carbonate, CaCO3)

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Ferruginous Quartz

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

Pyrite

Iron Sulfide (FeS2)

Yellow Chalcedony

Silicon Dioxide (SiO2)

Graphic Granite

Graphic Granite (a variety of Pegmatite)

Weathered Quartzite or Chert Pebble

Silicon Dioxide (SiO2)

Sandstone (Water-worn Cobble)

Arenite (variable composition, primarily SiO2)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Chrysocolla

Hydrated copper silicates (Cu,Al)2H2Si2O5(OH)4·nH2O

Sandstone Cobble with Liesegang Rings

Arenite with iron oxide precipitation (SiO2 matrix with Fe2O3 banding)

Milky Quartz

Silicon Dioxide (SiO2)

Chert Nodule

Chert (SiO2)

Amazonite

K(AlSi3O8) - Microcline (Lead-bearing variety)

Quartzite (with possible Calcite/Limestone weathering)

Quartzite (primarily SiO2)

Pink Granite

Granite (Alkali-feldspar granite)

Quartz (Rose/Milky variety)

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2)

Fossiliferous Limestone

Bioclastic Limestone (composition: CaCO3)

Sandstone (likely Siltstone or Mudstone variety)

Clastic Sedimentary Rock (primarily SiO2 with iron oxides)

Fossilized Gastropod in Chert/Limestone

Internal mold of Gastropoda (Class) with CaCO3 or SiO2 mineral formula

Septarian Nodule (Septarian Dragon Stone)

Septarian Concretion (Composition: Calcite, Aragonite, and Limestone/Clay)

Jasper or Chert

Silicon Dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Sandstone (with biological crust)

Arenite (SiO2 based)

Pegmatite (Granitic)

Granitic Pegmatite containing Quartz, Feldspar, and Tourmaline (Schorl)

Fossil Coral

Scleractinia (fossilized calcium carbonate)

Sandstone (Iron-stained)

Arenite (composed primarily of SiO2 with Fe2O3 staining)

Fossiliferous Limestone

Biogenic Limestone (Calcium Carbonate, CaCO3)

Geode with Iron-Stained Quartz/Calcite

Silicon Dioxide (SiO2) or Calcium Carbonate (CaCO3) in Sedimentary Matrix

Desert Rose

Gypsum (variety Selenite) or Barite, CaSO4·2H2O

Fossiliferous Limestone (Crinoidal)

Bioclastic Limestone (predominantly CaCO3)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Clear Quartz Cluster

Silicon Dioxide (SiO2)

Diorite (Salt and Pepper Rock)

Phaneritic Plutonic Diorite; chemical composition roughly 52-63% silica (SiO2)

Chert (Jasper/Chalcedony)

Microcrystalline Silica (SiO2)

Quartz (Milky/Gravel variety)

Silicon Dioxide (SiO2)

Feldspar-rich Quartzite

Feldspathic Quartzite (Metamorphosed Sandstone)

Chalcedony Nodule (Agate/Chert)

Chalcedony (cryptocrystalline Silicon Dioxide, SiO2)

Amygdaloidal Basalt with Agate/Chalcedony Infills

Amygdaloidal Basalt (Composition: SiO2 and (Mg,Fe)2SiO4 in matrix; SiO2 in amygdule)