Portland cement (calcium / dolomite-magnesium chemistry)

Calcium counts as a structural material — used in larger quantity than iron, as Portland cement. Limestone → kiln → CaO → Ca(OH)₂ with water. Some Portland is calcium-magnesium from dolomite ore.

That's beryllium. Let's go down the periodic table — I'm going to skip magnesium for a second. Calcium — we've actually talked about that. How? It's used in larger quantities than steel. It's called Portland cement. I gave you the formula. You take calcium carbonate, called limestone — all these little sea critters gave their lives and deposited themselves at the bottom of the ocean over millions of years, and earthquakes brought them to the top. We mine it, turn it into powder, spread it on our lawns to get rid of acid rain. But we also can take it, put it in a kiln, drive off the CO2 at a thousand degrees centigrade, and end up with calcium oxide — burnt lime. Mix it with water and you get calcium hydroxide.