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  • $\begingroup$ Rocks are durable in the form of solid blobs, but a hollow high rising tower will crumble at the first major earthquake. $\endgroup$ Commented Nov 5, 2016 at 12:04
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    $\begingroup$ @ddriver Logically you'd reinforce it the same way we do with concrete. Tungsten has a high enough melting point to use as a frame in molten basalt. Basalt has somewhere between 3 and 6 times the compressive strength of concrete and is much less subject to acid etching and wind erosion. You could then use the same type of earthquake-resistant designs we're developing now and the ones in non-earthquake-prone areas should last quite a long time. The cost would be insane though, so nobody will do it. $\endgroup$ Commented Nov 8, 2016 at 20:13