Silicate structure
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10 Terms
What is a nesosilicate?
A mineral with isolated SiO₄ tetrahedra.
Give an example of a nesosilicate.
Olivine.
What is an inosilicate?
A mineral with chain structures of tetrahedra.
What is the structural difference between pyroxene and amphibole?
Pyroxene has single chains; amphibole has double chains.
What is a phyllosilicate?
A mineral with sheet structures of tetrahedra.
Give an example of a phyllosilicate.
Muscovite or biotite.
What is a tectosilicate?
A mineral with a 3D framework of tetrahedra.
Give an example of a tectosilicate.
Quartz or feldspar.
Why does amphibole have 60°/120° cleavage?
Because of its double-chain structure.
Why does pyroxene have ~90° cleavage?
Because of its single-chain structure.