Discussion
The basic unit of every silicate mineral is the
Answer: B
Correct answer: silicon-oxygen tetrahedron
Every silicate is built from a silicon atom surrounded by four oxygens at the corners of a tetrahedron. The whole classification of the silicates follows from how those tetrahedra are joined - isolated, in chains, in double chains, in sheets or in a framework - and so, in turn, do their cleavage and their hardness.
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