Minerals

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Basalt with Amygdules

Amygdaloidal Basalt

Ammonite Fossil (Polished Section)

Ammonoidea (typically mineralized with Calcite CaCO3)

Gneiss (with Mica and Quartz)

Gneissic Metamorphic Rock

Gneiss

Gneiss

Milky Quartz

Silicon Dioxide (SiO2)

Fluorite Tower

Fluorite (Calcium Fluoride - CaF2)

Siltstone or Sandstone Pebble

Lithic Arenite / Quartzose Siltstone

Milky Quartz with Chlorite/Epidote

Silicon Dioxide (SiO2) with phyllosilicate or sorosilicate inclusions

Chert (Nodular Chert)

Microcrystalline Quartz (SiO2)

Fossil Shark Tooth

Odontaspididae (likely Carcharias sp.)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Clear Quartz

Silicon Dioxide (SiO2)

Petrified Bone Pebble

Silicified Fossilized Bone

Peach Moonstone

Orthoclase Feldspar ((K,Na)AlSi3O8) with inclusions

Mica Schist

Mica Schist (primarily Muscovite or Biotite Schist)

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in sedimentary/volcanic host

Jasper

Jasper (Silicon Dioxide, SiO2)

Turquoise (Green variety)

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

Clear Quartz

Crystalline Silicon Dioxide (SiO2)

Moqui Marble (Shaman Stone)

Ironstone Concretion (Fe2O3 with a sandstone core)

Green Jasper

Silicon Dioxide (SiO2) with impurities

Banded Agate

Cryptocrystalline Quartz (SiO2)

Fossilized Crab Carapace (Concretion)

Decapoda (fossil), typically preserved in calcite or siderite concretion

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Slate

Slate (Foliated metamorphic rock consisting mainly of quartz and muscovite or illite)

Grey Agate

Silicon Dioxide (SiO2) - variety: Agate/Chalcedony

Chert (often colloquially called Flint)

Chert (Microcrystalline Quartz, SiO2)

Olivine (Peridotite)

Magnesium Iron Silicate - (Mg, Fe)2SiO4

Mixed Polished Gemstones (Tumbled Stones)

Mixed Silicates and Oxides (SiO2, KAlSi3O8, Ca2Al2Be3Si6O22, etc.)

Ironstone (Limonite/Hematite)

Ferruginous Sedimentary Rock (composed largely of Fe2O3 and FeO(OH)·nH2O)

Green Jasper

Silicon dioxide (SiO2)

Basalt with Iron Oxides

Mafic Igneous Rock (Mafite)

Limestone

Sedimentary rock composed of Calcium Carbonate (CaCO3)

Quartz Crystal Fragment

Quartz (Silicon Dioxide, SiO2)

Glauconite (Greensand)

(K, Na)(Fe3⁰, Al, Mg)₂(Si, Al)₄O₁₀(OH)₂

Quartz (Milky variant)

Silicon Dioxide (SiO2)

Banded Marble

Recrystallized Calcite (CaCO3)

Chert (Nodule)

Silicon Dioxide (SiO2)

Blue Quartzite (Blue Aventurine / Dumortierite Quartz)

Quartzite with inclusions (SiO2 with AlAl4BSi3O18)

Milky Quartz

Silicon Dioxide (SiO2)