Question:
Which one of the following minerals does not come under the category of Halite group?
Which one of the following minerals does not come under the category of Halite group?
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The halite group consists of simple isometric halide minerals that share the rock-salt (NaCl) structure type, such as halite, sylvite, sal ammoniac and villiaumite.
Updated On: Jun 16, 2026
- Cryolite
- Sylvite
- Sal Ammoniac
- Villiaumite
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The Correct Option is A
Solution and Explanation
Concept:
The halite group consists of simple isometric halide minerals that share the rock-salt (NaCl) structure type, such as halite, sylvite, sal ammoniac and villiaumite.
Step 1:
Sylvite (KCl), Sal Ammoniac (NH4Cl) and Villiaumite (NaF) all crystallise in the cubic system with the halite-type structure, so they belong to the halite group.
Step 2:
Cryolite (Na3AlF6) is a complex sodium aluminium fluoride that crystallises in the monoclinic system and does not share the simple rock-salt structure, so it does not belong to the halite group.
Answer: Option (1) — Cryolite.
The halite group consists of simple isometric halide minerals that share the rock-salt (NaCl) structure type, such as halite, sylvite, sal ammoniac and villiaumite.
Step 1:
Sylvite (KCl), Sal Ammoniac (NH4Cl) and Villiaumite (NaF) all crystallise in the cubic system with the halite-type structure, so they belong to the halite group.
Step 2:
Cryolite (Na3AlF6) is a complex sodium aluminium fluoride that crystallises in the monoclinic system and does not share the simple rock-salt structure, so it does not belong to the halite group.
Answer: Option (1) — Cryolite.
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