Q362
Y-index value for illitic type clay is
A.
0 - 5
B.
5 - 25
AnswerC.
> 25
D.
None of the above
Answer: Option B
Solution
Answer: Option B
Solution:
An illite is a group of closely related non-expanding clay minerals. It is a secondary mineral precipitate, and an example of phyllosilicate, or layered alumino-silicate. Its structure is a 2 : 1 sandwich of silica tetrahedron-alumina octahedron-silica tetrahedron.The y-index value for illitic clay is between 5 - 25.