Discussion
Which of the following minerals is a ring silicate ?
Answer: D
The ring silicate is Tourmaline.
Silicates are classified by how their SiO4 tetrahedra link. In ring silicates (cyclosilicates) the tetrahedra join into closed rings; tourmaline and beryl both contain six-membered rings.
Pyrophyllite is a sheet silicate (phyllosilicate), enstatite a single-chain silicate (pyroxene, an inosilicate), and forsterite, the magnesium olivine, an island silicate (nesosilicate) whose tetrahedra are isolated from one another.
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