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Opals are found in the ground and people who mine them also tend to live underground.I hear there might be cheap units at the Opal Tower
Opal is also the name for a petrol substitute used in communities where sniffing has been a problem. It's low octane but it runs the engine. Benefit is people can't really sniff it apparently so that's why it's used.
So putting that together we've got something that's highly flammable, not very strong and found underground. Probably not the best choice of name for a skyscraper.....