Sedimentary Or Igneous (Secondary Formation)

Orange Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with iron oxide cement)

Calamites (Fossilized Horsetail)

Calamites suckowii (Family: Calamitaceae)

Sandstone (Ferruginous)

Arenite (with Goethite/Limonite cement)

Basalt with Quartz/Calcite Vein

Basalt (Mafic Volcanic Rock with secondary mineralization)

Yellow Ochre / Limonite

Limonite (FeO(OH)·nH2O)

Granite

Granite (composed primarily of Quartz SiO2 and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8))

Granite

Phaneritic plutonic rock (Felsic)

Basalt with Limonite stains

Extrusive mafic igneous rock; Limonite (FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite (primarily SiO2 with Fe2O3 cementation)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic silicate with secondary mineral inclusions)

Satin Spar (Gypsum)

Hydrous Calcium Sulfate (CaSO4·2H2O)

Sandstone

Arenite (composed primarily of SiO2, or Silicon Dioxide)

Limestone

Calcium Carbonate (CaCO3)

Flexicalymene Trilobite Fossil

Flexicalymene meeki (Order Phacopida, Family Calymenidae)

Carnelian

Chalcedony (SiO2)

Red Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Chalcedony Geode Fragment

Microcrystalline Quartz (SiO2)

Red Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Basalt (River Pebble)

Basalt (dominated by Plagioclase Feldspar and Pyroxene)

Porphyritic Basalt

Amygdaloidal Porphyritic Basalt

Amygdaloidal Basalt with Secondary Minerals

Basalt containing secondary mineralization (likely Chlorite, Celadonite, or Zeolites)

Basalt with Secondary Mineralization (Likely Zeolites or Calcite)

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

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Quartz (SiO₂)

Travertine

Calcareous tufa (CaCO3)

Orange Calcite

Calcium Carbonate (CaCO3)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Variscite in Matrix

Variscite (AlPO4 · 2H2O)

Ferruginous Quartz

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

Carnelian

SiO2 (Silicon Dioxide), a variety of Chalcedony

Agate (or Chalcedony)

Silicon Dioxide (SiO2)

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Agate (Chert/Chalcedony)

Silicon Dioxide (SiO2)

Carnelian Agate

Silicon Dioxide (SiO2) with iron oxide impurities

Howlite

Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)

K2 Jasper (K2 Granite)

Azurite in Granite (K(Mg,Fe)3AlSi3O10(OH,F)2 + Cu3(CO3)2(OH)2)

Dinosaur Fossil (Tyrannosaurus rex skull replica/specimen)

Tyrannosaurus rex (fossilized in permineralized sedimentary matrix)

Granite

Granite (Felsic Plutonic Rock)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Turquoise (set in silver jewelry)

Turquoise - CuAl6(PO4)4(OH)8·4H2O (Hydrated copper and aluminum phosphate)