ActuallyAdditions/src/main/resources/assets/actuallyadditions/models/item/blockQuartzStair.json

{
    "parent": "actuallyadditions:block/blockQuartzStairs",
    "display": {
        "thirdperson": {
            "rotation": [ 10, -45, 170 ],
            "translation": [ 0, 1.5, -2.75 ],
            "scale": [ 0.375, 0.375, 0.375 ]
        },
        "gui": {
            "rotation": [ 0, 180, 0 ]
        }
    }
}