Magnesium is common in laptops, as it is lighter than Aluminum. My yard allows me to mix it with Aluminum as long as there is not a lot of it. It is used in a bunch of different Aluminum alloys. One thing to understand is that it is extremely flammable, and difficult to extinguish once it ignites. Large chunks/pieces are difficult to ignite, but grindings/small broken pieces are more likely to start a fire.