Bentonite is formed from the alteration of which material?

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Study for the ASBOG Fundamentals of Geology exam. Access flashcards, multiple-choice questions, and understand key geologic principles. Prepare confidently for your exam!

Multiple Choice

Bentonite is formed from the alteration of which material?

Explanation:
Bentonite forms when volcanic ash is altered in the presence of water to produce swellable clay minerals, mainly smectite such as montmorillonite. The glassy components in volcanic ash weather chemically to these fine-clay minerals, giving the characteristic swelling properties of bentonite. This specific origin distinguishes bentonite from clays that form from limestone (carbonate rock) or sandstone (silica/quartz-rich material) or from generic clay formed by weathering of various minerals. The volcanic-ash pathway is the key reason bentonite develops its distinctive clay mineralogy and behavior.

Bentonite forms when volcanic ash is altered in the presence of water to produce swellable clay minerals, mainly smectite such as montmorillonite. The glassy components in volcanic ash weather chemically to these fine-clay minerals, giving the characteristic swelling properties of bentonite. This specific origin distinguishes bentonite from clays that form from limestone (carbonate rock) or sandstone (silica/quartz-rich material) or from generic clay formed by weathering of various minerals. The volcanic-ash pathway is the key reason bentonite develops its distinctive clay mineralogy and behavior.

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