"The primary component of the Earth's upper mantle, it is a common mineral in Earth's subsurface,[...]". This sentence, also from that same Wikipedia article, s

"The primary component of the Earth's upper mantle, it is a common mineral in Earth's subsurface,[...]". This sentence, also from that same Wikipedia article, seems to suggest that availability wouldn't be the problem. But, whether the whole process is practical/reasonable, is another question entirely.