Question

Match the minerals in Group I with the corresponding composition in Group II. 
Group I          Group II 
P. Leucite        1. (K,Na)AlSi₃O₈ 
Q. Andradite   2. NaAlSi₂O₆ 
R. Sanidine      3. KAlSi₂O₆ 
S. Jadeite         4. Ca₃Fe₂Si₃O₁₂ 
 

• A. P–3; Q–1; R–4; S–2
• B. P–2; Q–3; R–1; S–4
• C. P–1; Q–4; R–2; S–3
• D. P–3; Q–4; R–1; S–2

Hint:

Feldspathoid (Leucite): KAlSi₂O₆
Feldspar (Sanidine): (K,Na)AlSi₃O₈
Garnet (Andradite): Ca₃Fe₂Si₃O₁₂
Pyroxene (Jadeite): NaAlSi₂O₆

Answer 1

The Correct Option is D

Step 1: Identifying mineral formulas.
- Leucite: KAlSi₂O₆ — a feldspathoid mineral containing potassium and aluminum silicate.
- Andradite: Ca₃Fe₂Si₃O₁₂ — a calcium–iron garnet variety.
- Sanidine: (K,Na)AlSi₃O₈ — high-temperature alkali feldspar.
- Jadeite: NaAlSi₂O₆ — a pyroxene group mineral.
Step 2: Matching.
P–3 (Leucite → KAlSi₂O₆)
Q–4 (Andradite → Ca₃Fe₂Si₃O₁₂)
R–1 (Sanidine → (K,Na)AlSi₃O₈)
S–2 (Jadeite → NaAlSi₂O₆)
Step 3: Conclusion.
The correct matching is (D) P–3; Q–4; R–1; S–2.