A silica tetrahedron is

1.	A silica tetrahedron is
A.	formed by four oxygen ions with their centres at the vertices of a tetrahedron and a silicon ion at the interstitial site inside the oxygen array
B.	a four sided figure (actually a square) arrangement of silicon ions, with one oxygen at the centre of the square
C.	the basic building block of all crystalline and glassy forms silica
D.	both (a) and (c)
Answer» E.

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A silica tetrahedron is

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