Mineral (Pseudomorph)

Gneiss

Gneiss

Iron-stained Quartz

Silicon Dioxide with Limonite (SiO2 + FeO(OH)·nH2O)

Gneiss (with iron staining)

Gneiss

Gabbro

Gabbro (Mafic Plutonic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (Metamorphic Rock)

Gneiss

Granite (Dioritic variant)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (specifically a Granitic Gneiss)

Gneiss (Composition: Quartz, Feldspar, Mica)

Feldspar in Matrix

Feldspar group minerals in metamorphic or igneous matrix

Copper Ore (Malachite and Limonite bearing rock)

Copper-bearing rock with secondary copper minerals

Magnetite (Lodestone)

Magnetite (Fe3O4)

Pyrite

Iron Sulfide (FeS2)

Sandstone Pebble

Arenite (Sandstone)

Sandstone

Arenite (SiO2 primarily)

Quartz Geode

Silicon Dioxide (SiO2)

Quartz Geode

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrous ferric oxide)

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Fossilized Shark Tooth

Chondrichthyes (Class) fossil

Granite

Felsic intrusive igneous rock

Native Copper

Native Copper (Cu)

Blue Apatite

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

Amygdaloidal Basalt

Amygdaloidal Mafic Volcanic Rock

Vanadinite

Pb5(VO4)3Cl

Turquoise

CuAl6(PO4)4(OH)8"""""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" • 4H2O (Hydrated copper and aluminum phosphate)

Turquoise

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

Limonite

FeO(OH)•nH2O

Hematite (Botryoidal / Kidney Ore)

Iron Oxide (Fe2O3)

Lepidolite

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

Limonite with Ironstone

Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

Limonite (Ironstone)

Hydrous ferric oxides (FeO(OH)·nH2O)

Gneiss (with Quartz-Feldspar vein)

Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)

Sandstone (Ferruginous)

Arenite (Fe2O3 staining)

Polished serpentine

Serpentine-group minerals, chiefly lizardite and/or antigorite; approximate formula Mg₃Si₂O₅(OH)₄

Goldstone (Brown)

Aventurine glass

Shattuckite (Blue Quartz/Jasper Matrix)

Shattuckite (Copper Silicate Hydroxide - Cu5(SiO3)4(OH)2)

Schist

Mica Schist (Metamorphic rock)

Chrysocolla

Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O

Ironstone Concretion (Limonite/Goethite)

Ferruginous Sandstone or Limonite (FeO(OH)·nH2O)