Si, Al - Tetrahedral sites Ca, Mg, Fe2+, Al- Octahedral sites Pyroxenes have a g
ID: 699694 • Letter: S
Question
Si, Al - Tetrahedral sites
Ca, Mg, Fe2+, Al- Octahedral sites
Pyroxenes have a general structural formula of XYZ2O6 , where Z= Si4+ or Al3+ in tetrahedral coordination
X= Na+, Ca2+ ,Mn2+, Mg2+ ,or Fe2+ filling octahedral sites called M2
Y= Mn2+, Mg2+, Al3+, Cr3+ or Ti4+ filling smaller octahedral sites called M1
Although Al is commonly present only in small amounts in the pyroxene structure, it can occur in both tetrahedral and octahedral coordination. High temperatures and relatively low pressures favour tetrahedral coordination for Al.
High pressures favour increased coordination number with negligible tetrahedral Al.
Explanation / Answer
The following is a chemical formula for a pyroxene: (Ca,Mg, Fe2+, Al)2(Si,Al)206 Which element(s) occupy the tetrahedral sites? Which element(s) occupy the octahedral sites? The following is a chemical formula for a pyroxene: (Ca,Mg, Fe2+, Al)2(Si,Al)206 Which element(s) occupy the tetrahedral sites? Which element(s) occupy the octahedral sites? The following is a chemical formula for a pyroxene: (Ca,Mg, Fe2+, Al)2(Si,Al)206 Which element(s) occupy the tetrahedral sites? Which element(s) occupy the octahedral sites?Related Questions
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