eaglercraft-1.8-workspace/desktopRuntime/resources/assets/minecraft/blockstates/stone.json

{
    "variants": {
        "normal": [
            { "model": "stone" },
            { "model": "stone_mirrored" },
            { "model": "stone", "y": 180 },
            { "model": "stone_mirrored", "y": 180 }
        ]
    }
}