Bridging oxygen Apical oxygen Non-bridging oxygen.

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Presentation transcript:

Bridging oxygen Apical oxygen Non-bridging oxygen

Ca2Si2O6 Fe2Si2O6 Mg2Si2O6

Ca Mg Fe

Quad Pyroxenes Ca Mg Fe

Quad Pyroxenes Ca Pyroxenoids Mg Fe

Wollastonite Ca Mg Fe Enstatite Ferrosilite

Ca Diopside Hedenburgite Mg Fe Ferrosilite

Ca Diopside Hedenburgite Pigeonite Mg Fe Ferrosilite

Ca Diopside Hedenburgite Augite Pigeonite Mg Fe Enstatite Ferrosilite

Ca Diopside Hedenburgite Augite Pigeonite Mg Fe Enstatite Ferrosilite

Y = ions in 5 octahedral M2, M1, M3 sites Amphibole Site Nomenclature W0-1 X2 Y5 Z8O22 (OH,F)2 W = ions in A site, 10-12 coordinated (Na, K) X = ions in 2 M4 sites, 6-8 coordinated (Mg, Fe2+, Ca, Na) Y = ions in 5 octahedral M2, M1, M3 sites (Mg, Fe2+, Fe3+, Al, Ti) Z = Si or Al in tetrahedral sites