Reminds of the Anne McCaffrey Crystal Singer series where crystals were mined for use in their space-faring technology. Each crystal was unique and would be tun

Reminds of the Anne McCaffrey Crystal Singer series where crystals were mined for use in their space-faring technology. Each crystal was unique and would be tuned to a particular use. https://en.wikipedia.org/wiki/Crystal_Singer https://en.wikipedia.org/wiki/Crystal_Singer