Metamorphic Minerals

 

Minerals occurring mostly in PELITIC (aluminous) rocks:

 

            MUSCOVITE             KAl2(AlSi3)O10(OH)2

            BIOTITE                     K(Fe, Mg)3(Al,Fe)(Si3O10(OH)2

           

            Al2SiO5 polymorphs:     ANDALUSITE (low-P)

                                                KYANITE (high-P)

                                                SILLIMANITE (high-T)

 

            STAUROLITE (Fe, Mg, Zn)2Al9Si4O23(OH)

           

            ALMANDINE-PYROPE Garnet         (Fe, Mg)3Al2(SiO4)3  

           

Minerals occurring mostly in  CALCAREOUS rocks:

 

            DIOPSIDE-HEDENBURGITE            Ca (Fe, Mg)Si2O6

            TREMOLITE-ACTINOLITE              Ca2(Fe, Mg)5Si8O22(OH)2

            HORNBLENDE

 

            Carbonates:      CALCITE        DOLOMITE

 

            EPIDOTE  (Ca-Al-Fe) hydrated silicate

 

            Ca Garnets:      GROSSULARITE  (Ca, Al) garnet

                                    ANDRADITE    (Ca, Fe) garnet

 

Minerals occurring mostly in MAFIC rocks:

 

            AUGITE

            HORNBLENDE  Moderate to high-Ca (Fe+Mg) amphibole

 

            PLAGIOCLASE

 

            CHLORITE   Hydrated Mg-Fe Clay (“mica-like”)

            EPIDOTE  

            ACTINOLITE High-Ca (Fe+Mg) amphibole

 

Minerals occurring mostly in ULTRAMAFIC rocks:

 

            Hydrous: ACTINOLITE  CHLORITE TALC  SERPENTINE 

 

            Anhydrous:  Olivine  clinopyroxene  orthopyroxene  spinel  pyrope garnet  Jadeite