Igneous, Sedimentary, Metamorphic

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Yellow Calcite

Calcium Carbonate (CaCO3)

Note: Image shows a biological specimen (Rat), not a rock. Representative geological equivalent: Galena (due to lead-grey colors in fur).

Galena (PbS)

Pyrite

Pyrite (FeS2)

Crystal Quartz Beads (likely Clear Quartz)

Quartz (SiO₂)

Blue Kyanite

Kyanite (Al2SiO5)

Milky Quartz Pebble with Matrix

Silicon Dioxide (SiO2)

Amphibolite / Hornblende Schist

Amphibolite

Greenschist

Chlorite schist

Sodalite in Quartz

Na8(Al6Si6O24)Cl2 (Sodalite) / SiO2 (Quartz)

Garnet (Almandine-Pyrope)

Almandine-Pyrope Mg3Al2(SiO4)3 to Fe3Al2(SiO4)3

Greenschist

Greenschist (composed mainly of actinolite/tremolite, chlorite, and epidote)

Greenstone (Greenschist)

Greenschist facies rock (containing chlorite, actinolite, and epidote)

Slate

Foliated Metamorphic Rock (Mainly composed of Quartz, Illite, Chlorite)

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Sodalite

Na8(Al6Si6O24)Cl2

Magnetite

Magnetite (Fe3O4)

Muscovite Mica (in Quartz matrix)

Potassium aluminum silicate hydroxide fluoride (KAl2(AlSi3O10)(F,OH)2)

Garnet and Quartz

Pyrope or Almandine (Red Garnets) and Quartz (Center Stone)

Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz (Water-worn pebble/nodule)

Quartz (Silicon Dioxide - SiO2)

Biotite Schist

Biotite Schist (Metamorphic Rock featuring K(Mg,Fe)3AlSi3O10(OH)2)

Pyrite

Iron Disulfide (FeS2)

Milky Quartz with Talc / Serpentine

Silicon Dioxide (SiO2) with Mg3Si4O10(OH)2

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Lapis Lazuli

Lapis Lazuli (Complex silicate mineral mix including Lazurite, Pyrite, and Calcite)

Greenstone

Chlorite schist or Epidosite

Mica (likely Muscovite)

Muscovite / KAl2(AlSi3O10)(OH)2

Schist

Mica Schist

Banded Gneiss

Gneiss (pronounced "nice")

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Garnet

Almandine formula: Fe3Al2(SiO4)3

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Red Jasper

Microcrystalline Quartz (SiO2)

Quartz (Iron-stained River Pebble)

Silicon Dioxide (SiO2)

Feldspar (Plagioclase / Orthoclase)

KAlSi3O8 / CaAl2Si2O8 - NaAlSi3O8

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Smoky Quartz with possible inclusion

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Serpentine

Serpentine group ((Mg,Fe,Ni,Al,Zn,Mn)3(Si,Al)2O5(OH)4)