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What is the percentage composition of quartz in Southern bentonite?

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in Casting-Forming-Welding I by (687k points)
What is the percentage composition of quartz in Southern bentonite?

(a) 5%

(b) 10%

(c) 15%

(d) 20%

I had been asked this question in final exam.

The question is from Molding Sands Binders topic in portion Molding and Core Sands of Casting-Forming-Welding I

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Right answer is (c) 15%

The explanation: Bentonite is classified into 2 types, namely, Sodium montmorillonite and Calcium montmorillonite.  Southern bentonite also called as Calcium montmorillonite is known to have a percentage composition 15% of quartz.

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