Question

Given below mineral species and their soil silicate classification
A. Tourmaline - Cyclosilicates
B. Amphiboles - Inosilicates
C. Olivine - Nesosilicates
D. Feldspar - Phyllosilicates
E. Pyroxene - Tectosilicates
Choose the correct answer from the options given below:

• A. A, B and D only
• B. A, B, D and E only
• C. A, B, C and E only
• D. A, B and C only

Hint:

Silicate classification:
- Nesosilicates: Olivine
- Inosilicates: Amphiboles, Pyroxenes
- Phyllosilicates: Micas, Clays
- Tectosilicates: Feldspar, Quartz
- Cyclosilicates: Tourmaline

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
Silicate minerals are classified according to the arrangement of their \(\text{SiO}_4\) tetrahedra, forming isolated, chain, ring, sheet, or framework structures.

Step 2: Classification of Minerals:
The given minerals belong to the following silicate groups:
• Tourmaline $\rightarrow$ Cyclosilicate (ring structure)
• Amphiboles $\rightarrow$ Inosilicate (double-chain structure)
• Olivine $\rightarrow$ Nesosilicate (isolated tetrahedra)
• Feldspar $\rightarrow$ Tectosilicate (framework structure)
• Pyroxene $\rightarrow$ Inosilicate (single-chain structure) Thus, statements A, B, and C are correct, while D and E are incorrect.

Step 3: Final Answer:
A, B and C only} Hence, the correct option is (A).
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