Gravel is a kind of lime when viewed as a material for concrete. How about when a pebble hits a drop of water from the tip of a stalactite, it turns into gravel?
How about generating gravel by having flowing water go on top of granite? Or even quartz since that's what it's made up of? Or even the other two rock types andesite and diorite? The raw form of those rock types i mean (not quartz). Since they rarely are used for building anyways? *thinkingface*
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