Minerals

Granite Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gold Nugget (Placer Gold)

Native Gold (Au)

Blue Apatite

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

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Blue Apatite

Fluoroapatite (Ca5(PO4)3F)

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Tiger's Eye (with Blue Tiger's Eye / Hawk's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2 with inclusions)

Quartz Pebble

Silicon Dioxide (SiO2)

Bauxite

Bauxite (Al2O3·2H2O)

Lepidolite

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

Amygdaloidal Basalt

Amygdaloidal Basalt

Gneiss (Metamorphic Rock)

Gneiss (variable mineral formula primarily containing Quartz, Feldspar, and Mica)

Amethyst (Polished/Carved Crystal)

Silicon Dioxide (SiO2) with trace Iron (Fe)

Dalmatian Jasper

Peralkaline Feldspar Diorite/Rhyolite

Limonite (Ironstone Concretion)

Limonite (Hydrous ferric oxide mixture, FeO(OH)·nH2O)

Iron Gossan (Limonite/Goethite)

Hydrated Iron Oxides (FeO(OH)·nH2O) from oxidation zones

Diorite

Diorite

Banded Gneiss

Gneiss (Metamorphic Rock)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2)

Chondrite Meteorite Fragment

Ordinary Chondrite (L or H type)

Native Copper with Malachite and Chrysocolla

Native Copper (Cu) with Malachite [Cu2CO3(OH)2] and Chrysocolla [(Cu,Al)2H2Si2O5(OH)4·nH2O]

Limonite

Hydrous Iron Oxide (often Goethite FeO(OH), Lepidocrocite γ-FeO(OH), and other amorphous iron oxyhydroxides)

Sandstone

Arenite (Siliclastic sedimentary rock), SiO2 + various minerals

Quartz

Silicon Dioxide (SiO2)

Yellow Topaz (Imperial or Precious Topaz)

Al2SiO4(F,OH)2 (Aluminum Silicate Fluoride Hydroxide)

Honey Calcite

Calcium Carbonate (CaCO3)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Granite

Granite (High-silica plutonic rock)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)

Amygdaloidal Basalt

Amygdaloidal Basalt (with secondary mineral infilling)

Sulfur

Native Sulfur (S)

Vanadinite

Vanadinite (Pb5(VO4)3Cl)

Rose Quartz

Silicon Dioxide with traces of Titanium, Iron, or Manganese (SiO2)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Petrified Wood

Silicified Wood (primarily Quartz/Chalcedony, SiO2)

Sandstone with Iron Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Sandstone (Ferruginous)

Clastic sedimentary rock (SiO2 with Fe2O3)

Greenstone (Epidosite)

Epidosite (Metamorphosed Basalt/Diabase)

Quartz River Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)