This week's Geo-Whiz Quiz is another no-holds-barred, mixed-martial-arts General Geology Quiz that only the most polymathic of geophiles will master! Show us your wide intellectual range and your imperturbable aplomb as you take this challenging quiz. Do your worst—I'll bet you will.
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A miner (pun) quibble with the definition of ‘gangue’.
Gangue is not necessarily ‘worthless’ as it frequently contains some valuable mineral so it has worth but there is not enough mineral to be extracted economically. The mineral content is not worth extracting in other words.
Point taken!