Which of the following used to be more precious than gold or silver,due to difficulties refining it?

Question

Quizplus · Accepted Answer

Aluminum used to be more precious than gold or silver because it was difficult to refine it. In the 19th century, it was even more valuable than gold due to the challenges in its extraction and production. However, advancements in technology have made it easier to refine aluminum, and it is no longer as precious as it once was.

Which of the Following Used to Be More Precious Than