Flywheel/src/main/resources/data/create/recipes/crushing/gravel.json

{
    "type": "create:crushing",
    "ingredients": [
    	{
    		"item": "minecraft:gravel"
    	}
    ], 
	"results": [
		{
			"item": "minecraft:sand",
			"count": 1
		},
		{
			"item": "minecraft:clay_ball",
			"count": 1,
			"chance": 0.1
		},
		{
			"item": "minecraft:flint",
			"count": 1,
			"chance": 0.2
		}
	],
	"processingTime": 250
}