Discussion
All of the following contribute to the loss on ignition of a clay EXCEPT
Answer: A
Correct answer: quartz remaining unchanged in the sample
Loss on ignition is a weight loss, so anything that stays put contributes nothing. Quartz is stable to well above the ignition temperature and simply remains. The genuine contributors are the hydroxyl water leaving the clay lattice, which usually dominates, carbon dioxide from any carbonates, and organic matter burning away.
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