Making your own powdered cement by crushing rocks, DIY project

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I wanted to learn how to make my own cement, and I remember taking the ground Rock by digging Down Under small rocks, the grayish powder I got from under the Rocks falling on each other was then microwave, or heat it. In my case I use the microwave and old ones. After doing that I mixed it with water and I was able to make my own makeshift cement. But how do I Crush enough rocks to make this feasible for projects I want to do then I found this video.