Metamorphic Or Igneous (Context Dependent)

Biotite Schist

Biotite-bearing Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)

Gneiss

Gneiss

Greenstone

Metabasalt (often contains Chlorite, Actinolite, and Epidote)

Granite Gneiss

Granitic Gneiss

Nuummite

Nuummite (mixture of Anthophyllite and Gedrite)

Gneiss

Gneiss

Gneiss (Cobble)

Gneiss

Nephrite Jade

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

Greenstone

Metabasalt / Chlorite-Epidote Schist

Greenstone

Greenschist / Meta-basalt

Quartz-veined Gneiss

Gneiss with Quartz (SiO2) intrusions

Gneiss (specifically Banded Gneiss)

Gneiss

Banded Gneiss

Gneiss (Metamorphic high-grade, predominantly SiO2, Al2O3, K2O, Na2O)

Serpentine

Antigorite, Lizardite, or Chrysotile; (Mg,Fe)3Si2O5(OH)4

Quartz crystal cluster

Quartz (silicon dioxide, SiO₂)

Black Granite

Phaneritic Mafic Igneous Rock (likely Gabbronorite or Dolerite)

Sandstone (Arkose)

Arkose Sandstone (principally SiO2 with Feldspar)

Likely quartz fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz or quartz-rich rock

Orange Quartz (Citrine Quartz)

Silicon Dioxide (SiO2) with iron impurities

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Greenstone with Epidote or Quartz Vein

Epidiorite or Metabasalt (composed largely of Chlorite, Epidote, and Amphibole)

Quartz–mica metamorphic rock, likely schist

Quartz–muscovite/biotite schist; predominantly SiO₂ quartz with phyllosilicate micas

Magnetite / Iron Ore

Magnetite (Fe3O4)

Tumbled orbicular granite or granitic gneiss

Granite, chiefly quartz–feldspar–biotite/amphibole; exact variety uncertain from the image

Gold Ore

Native Gold (Au) in Quartz or Silicate matrix

Polished pink-and-black granite or gneiss

Granite–gneiss, chiefly quartz, feldspar, and biotite/amphibole

Schist

Mica Schist (formula variable based on mineral content, typically containing [K,Al,Fe,Mg,Si,O,H])

Epidote in Quartz

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) in Milky Quartz (SiO2)

Gneis

Gneiss (High-grade metamorphic rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)

Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)

Green-and-gold apatite-bearing rock, possibly epidote skarn

Apatite-group mineral, commonly fluorapatite (Ca₅(PO₄)₃F), with probable epidote and quartz; exact identification requires testing

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Peacock Ore

Bornite (Cu5FeS4) or Chalcopyrite treated with acid

Pyrite

Iron Sulfide (FeS2)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Gneiss (Stream-worn Cobble)

Gneiss (Metamorphic rock composed primarily of Quartz, Feldspar, and Mica)

Gneiss

Gneiss

Milky Quartz

Quartz (Silicon Dioxide, SiO2)