Mineral (Processed Alloy)

Carved Stone Turtle

Carved Soapstone and Quartz

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Agate (specifically, multi-colored or pastel-dyed agate)

Silicon dioxide (SiO2) - specifically, a cryptocrystalline variety of quartz known as Chalcedony, with banding classified as Agate. (If it were Fluorite, the chemical formula would be Calcium Fluoride - CaF2).

Limonite Concretion

FeO(OH)·nH2O (Hydrated Iron Oxide)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Granite fragment

Granite (Felsic Plutonic Rock)

Orange Calcite

Calcium Carbonate (CaCO3)

Aquamarine

Beryl (Be3Al2Si6O18), specifically the blue-green variety

Pallasite Meteorite

Pallasite (Stony-iron meteorite; Fe-Ni alloy with (Mg,Fe)2SiO4 olivine)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Shark Tooth Fossil

Carcharocles megalodon or similar extinct shark tooth

Petrified Wood

Silicified Wood (primarily SiO2 - Silicon Dioxide)

Petrified Wood

Silicified Wood (primarily SiO2)

Snowflake Obsidian

Volcanic Glass with Cristobalite inclusions

Moqui Marble

Hematite-Goethite Concretion (Fe2O3 / FeO(OH))

Spinifex Texture Komatiite

Komatiite (Ultramafic Volcanic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (SiO2 enriched metamorphic rock)

Kidney Stone

Calcium Oxalate (CaC2O4·nH2O)

Limonite Geode (Ironstone Concretion)

Limonite [FeO(OH)·nH2O] with possible Quartz or Calcite interior

Apophyllite cluster

Fluorapophyllite-(K), KCa4(Si8O20)(F,OH)·8H2O

Fossilized Tooth Fragment

Vertebrate Fossil (Mammalia indet.)

Lepidolite

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

Kidney Stone

Nephrolith (typically Calcium Oxalate - CaC2O4)

Bismuth

Bismuth (Bi)

Fossil Shark Tooth

Selachii fossil

Petrified Wood

Silicified wood (primarily SiO2)

Kidney Stone

Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)

Shark Tooth Fossil

Vertebrate fossilized tooth

Kidney Stone (Calcium Oxalate / Uric Acid)

Calcium Oxalate Monohydrate (Whewellite) / Calcium Oxalate Dihydrate (Weddellite)

Purpurite

Manganese Iron Phosphate, Mn3+(PO4)

Hematite

Iron Oxide (Fe2O3)

Fossilized Bone Fragment

Vertebrate Fossil

Banded Sandstone / Quartzite Pebble

Sedimentary quartz arenite with liesegang banding

Falcon's Eye (Blue Tiger's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Cobaltian Calcite

Cobalt-bearing Calcite (Ca,Co)CO3

Blue Apatite

Apatite (Ca5(PO4)3(F,Cl,OH))

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral inclusions

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Fossil Shark Tooth

Chondrichthyes (Class)