| List I (Structural characteristics of the minerals) |
List II (Type of clay mineral) |
| A. Presence of K ion in the interlayer space of crystal structure in clay |
I. Vermiculite minerals |
| B. Mg ions are adsorbed between the crystal units of clay minerals |
II. Smectite |
| C. Presence of one brucite layer (Mg(OH)₂) along with 2:1 type of clay mineral in the crystal lattice |
III. Illite |
| D. 2:1 type of expanding minerals |
IV. Chlorite |
A → III (Illite): Illite has K⁺ ions in the interlayer, making it non-expanding.
B → I (Vermiculite): Mg²⁺ ions are adsorbed between layers, giving it intermediate expansion.
C → IV (Chlorite): Has a characteristic brucite layer in addition to the 2:1 structure.
D → II (Smectite): Includes minerals like montmorillonite, which exhibit high swelling due to their expanding nature.
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