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Originally Posted by Joe Durnavich
The titanium is typically bound up in the mineral ilmenite, which is more abundant in the basaltic lavas of the maria.
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The area I live in is largely originated via volcanism and all the sands we have are made mostly from crushed volcanic rock. This means that they are high in Iron and so are called Iron Sands and can be mined for the iron. Once the iron is removed there is only the rock slag left and guess what that mostly is.... Titanium. Unfortunately it is chemically bonded into the slag, unlike the iron, and so extracting it is cost prohibitive, but it is still about 60-70% Titainum.