The long, low, broad swoop of ink was totally unlike the stiff, jerky spikes that my advisor and I thought we might see, and it clearly indicated that my mineral was an opal. I stood and stared at the readout, knowing that there was no way I had—or anybody could have—possibly misinterpreted the result. It was opal and this was something I knew, something I could draw a circle around and testify to as being true. While looking at the graph, I thought about how I now knew something for certain that only an hour ago had been an absolute unknown, and I slowly began to appreciate how my life had
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