Determining the structure of a silicate mineral? - mineral sheet
Question:
The structure of silicates, whose composition is Fe 2 If ... O4
a. silicate framework
b. Independent tetrahedra
c. Single Chain
d. phyllosilicates
I understand that doing this with the formation of silicate tetrahedra to ... But I do not understand Fe2 comes into play, or how it fits, even if you already have an SiO4 tetrahedron.
Thanks for any help.
Mineral Sheet Determining The Structure Of A Silicate Mineral?
2 comments:
The mineral fayalite you mentioned, the end-member fayalite solid solution series forsterite belongs to Grupo olivine.
Olivine is generally Nessus-silicates. Here are a number of SiO 4 (-4) are to be tetrahit by metal cations (Mg 2 + or Fe 2 +) together. The corners of the tetrahedra are shared in fact by Fe or Mg.
She probably thought SiO4 is balanced, but it is not. SiO2 is balanaced but SiO4 negative with 4 charges.
His answer is, no doubt, (b) an isolated tetrahedron.
The structure depends on the size of the Fe 2 +. When these ions is small enough to pass each other between the tetrahedron, the contact, then a framework silicate can be formed,
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