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Bridging oxygen. Apical oxygen. Non-bridging oxygen. Ca 2 Si 2 O 6. Fe 2 Si 2 O 6. Mg 2 Si 2 O 6. 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. - PowerPoint PPT Presentation
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Bridging oxygen
Non-bridging oxygen
Apical oxygen
Ca2Si2O6
Mg2Si2O6
Fe2Si2O6
Ca
Mg Fe
Ca
Mg Fe
Quad Pyroxenes
Ca
Mg Fe
Quad Pyroxenes
Pyroxenoids
Ca
Mg FeEnstatite Ferrosilite
Wollastonite
Ca
Mg Fe
Diopside Hedenburgite
Ferrosilite
Ca
Mg Fe
Diopside Hedenburgite
Pigeonite
Ferrosilite
Ca
Mg Fe
Diopside Hedenburgite
Pigeonite
Augite
Enstatite Ferrosilite
Ca
Mg Fe
Diopside Hedenburgite
Pigeonite
Augite
Enstatite Ferrosilite
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
Chemistry of Amphiboles Name W0- 1 X2 Y5 Z8 tremolite Ca2 Mg5 Si8 O22(OH)2 anthophyllite Mg2
Mg5 Si8 O22(OH)2
gedrite Mg2 (AIMg4) (AISi7) O22(OH)2
___________________________________________________________________ tremolite Ca2 Mg5 Si8 O22(OH)2
tschermakite Ca2 (AIMg4) (AISi7) O22(OH)2
pargasite Na Ca2 (AIMg4) (AI2Si6) O22(OH)2
____________________________________________________________________ tremolite Ca2 Mg5 Si8 O22(OH)2
edenite Na Ca2 Mg5 (AlSi7) O22(OH)2
pargasite Na Ca2 (AlMg4) (AI2Si6) O22(OH)2 ___________________________________________________________________ tremolite Ca2 Mg5 Si8 O22(OH)2 ferroactinolite Ca2 Fe5 Si8 O22(OH)2 grunerite Fe2 Fe5 Si8 O22(OH)2
___________________________________________________________________ tremolite Ca2 Mg5 Si8 O22(OH)2 gluacophane Na2 (AI2Mg3) Si8 O22(OH)2
ferroglaucophane Na2 (Fe2+3Mg3) Si8 O22(OH)2
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