Mineral (Pseudomorph)

Sunstone

Heliolite (Oligoclase or Orthoclase Feldspar), (Ca,Na)(Al,Si)4O8

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Rough Citrine Quartz

Silicon Dioxide (SiO2) with ferric iron impurities

Amethyst (Quartz)

SiO2 (Silicon Dioxide)

Yellow Calcite

Calcite (Calcium Carbonate, CaCO3)

Specular Hematite (Specularite)

Iron Oxide (Fe2O3)

Schist

Mica Schist (variety: Muscovite/Biotite Schist)

Sandstone

Clastic Sedimentary Rock (composed mostly of quartz, SiO2)

Sandstone

Arenite (primarily SiO2)

Sandstone (Beach Pebble)

Clastic sedimentary rock (primarily Quartz and Feldspar)

Sandstone (likely Siltstone)

Arenite or Siltstone (high SiO2 content)

Aquamarine

Beryllium aluminum silicate (Be3Al2Si6O18)

Sandstone

Arenite (primarily SiO2)

Agate (Fortification Agate)

Banded Chalcedony (SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz Geode

Silicon Dioxide (SiO2)

Gold Nugget

Native Gold (Au)

Sandstone

Clastic sedimentary rock (primarily SiO2)

Carnelian Agate

Silicon Dioxide (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Gold Nugget

Native Gold (Au)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Gold-Bearing Quartz

Silicon Dioxide with Native Gold (SiO2 + Au)

Yellow Quartz (Citrine/Yellow Jasper)

Silicon Dioxide (SiO2)

Geode (unopened nodule)

Silicon Dioxide (SiO2) Nodule

Yellow Calcite

Calcium Carbonate (CaCO3)

Calcite

Calcium Carbonate (CaCO3)

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (SiO2 based with primary clasts 0.0625 to 2 mm)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

River Rock (likely Siltstone or fine-grained Sandstone)

Clastic Sedimentary Rock

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

Citrine or Yellow Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Nephrite Jade

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

Rose Quartz

SiO2 (Silicon Dioxide with trace inclusions of dumortierite)

Olivine (Peridot)

Olivine (Mg, Fe)2SiO4

Fuchsite (Green Muscovite in Quartz)

Chromium-rich Muscovite (K(Al,Cr)2(AlSi3O10)(OH)2)

Green Moss Agate

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

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Dalmation Stone (Dalmation Jasper)

Peralkaline rock (primarily Feldspar and Quartz with Arfvedsonite spots)

Biotite (Black Mica)

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