The silicate tetrahedron (SiO4
) is the basic
chemical unit of all silicate minerals. The number
of tetrahedra in the crystal structure and how
they are arranged determine how a silicate
mineral is classified.
Serpentine silicates are classified as ‘sheet
silicates’ because the tetrahedra are arranged
to form sheets. Amphibole silicates are classified
as ‘chain silicates’ because the tetrahedra
are arranged to form a double chain of two rows
aligned side by side. Magnesium is coordinated
with the oxygen atom in serpentine silicates. In
amphibole silicates, cationic elements such as
aluminium, calcium, iron, magnesium, potassium,
and sodium are attached to the tetrahedra.
Amphiboles are distinguished from one another
by their chemical composition. The chemical
formulas of asbestos minerals are idealized. In
The silicate tetrahedron (SiO4) is the basicchemical unit of all silicate minerals. The numberof tetrahedra in the crystal structure and howthey are arranged determine how a silicatemineral is classified.Serpentine silicates are classified as ‘sheetsilicates’ because the tetrahedra are arrangedto form sheets. Amphibole silicates are classifiedas ‘chain silicates’ because the tetrahedraare arranged to form a double chain of two rowsaligned side by side. Magnesium is coordinatedwith the oxygen atom in serpentine silicates. Inamphibole silicates, cationic elements such asaluminium, calcium, iron, magnesium, potassium,and sodium are attached to the tetrahedra.Amphiboles are distinguished from one anotherby their chemical composition. The chemicalformulas of asbestos minerals are idealized. In
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