Non Geological

Jasper with Iron Staining

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Fluorite

Calcium Fluoride (CaF2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Milky Quartz Pebble

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Nephrite Jade

Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)

Amazonite

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

Biotite (Black Mica)

Biotite (K(Mg,Fe)3AlSi3O10(OH)2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Chert (Flint)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Green Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite inclusions

Chert (and Limestone) River Cobble

Microcrystalline Quartz (SiO2) within Calcium Carbonate (CaCO3)

Green Moss Agate

Agate (Silicon Dioxide - SiO2) with inclusions of hornblende or chlorite

Honey Calcite Geode Segment

Calcite (Calcium Carbonate, CaCO3)

Chert / Flint

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Jasper (Red Jasper)

Jasper (Silicon Dioxide, SiO2)

Pink Granite

Felsic intrusive igneous rock (composition: SiO2 and Al2O3)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone

Arenite (primarily Quartz, SiO2)

Labradorite (Polished Crystal Point)

Labradorite (a calcium-enriched feldspar mineral), (Ca, Na)(Al, Si)4O8

Granite

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

Chert (Black Chert/Flint)

Silicon Dioxide (SiO2)

Quartzite

Quartzite (primarily SiO2)

Lapis Lazuli

Na6Ca2(Al6Si6O24)(SO4,S,Cl,OH)2 (Lazurite-dominated rock)

Green Aventurine

Aventurine Quartz (SiO2 with inclusions of Fuchsite)

Chert (Jasper variety)

Chert (SiO2)

Quartz (Milky/Common variant)

Silicon Dioxide (SiO2)

Labradorite

Labradorite (Ca,Na)(Al,Si)4O8

Milky Quartz

Silicon Dioxide (SiO2)

Glauconitic Sandstone (Greensand pebble)

Glauconitic Quartz Sandstone (K(Fe,Al)2(Si,Al)4O10(OH)2)

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Citrine or Iron-Stained variety)

Silicon Dioxide (SiO2)

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

Quartzite

Quartzite (primarily SiO2)

Travertine (Ceramic Tile)

Terrestrial Sedimentary Rock / Calcium Carbonate (CaCO3)

Breccia

Breccia (Clastic Sedimentary Rock)

Quartz Pebble (Geode-like)

Silicon Dioxide (SiO2)

Yellow Quartzite

Quartzite (primarily SiO2)

Gold Nugget

Native Gold (Au)

Granite

Granite (Felsic Plutonic Rock)