GATE CE 2018 Set 2 — Question 21
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Geotechnical Engineering → Soil Phase & Index Properties → Soil Type Identification
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Question
The clay mineral, whose structural units are held together by potassium bond is
Correct answer
(B) Illite
Solution
Illite is a 2:1 clay mineral where the structural units (one octahedral sheet between two tetrahedral sheets) are held together by non-exchangeable potassium ions () in the interlayer spaces. These potassium bonds are relatively strong, making illite less expansive than smectite but more so than kaolinite (which is held by hydrogen bonds).
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