"A soul coin was made from a special type of iron called infernal iron. They were large coins, measuring 5 in (0.13 m) in width and 1 in (0.025 m) in thickness. They usually weighed about 0.33 lb (150 g). Both sides of the coin had infernal script etched onto its surface.
Each soul coin was infused with the soul of a single creature. The soul was tormented and filled with despair. As a result, any creature of a non-evil alignment was only able to carry a few coins at a time. A creature of an evil alignment was able to carry as many coins as they wished." (Adam Lee, Christopher Perkins (September 17, 2019). Baldur's Gate: Descent into Avernus. (Wizards of the Coast), p. 225. ISBN 0786966769.)

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