 Why does Evans have difficulty identifying crystals?
Evans, who had no watch, thought of the time as a quarter after Australia. Evans was a prospector, and like all prospectors, a sort of jackknife geologist, selenologist, rather. Evans sealed the turbine from the rest of the steam system by closing the shut-off valves. For example, because of an order of his stating that there would be no alcoholic beverages within the survey building, the entire survey was assured of a constant supply of home-made, but passably good liquor. The solar furnace was a rough parabola of mirrors used to focus the sun's heat on anything that it was desirable to heat.
 They were not actually crystals to begin with
 All of the crystals he found were very rare  He does not have much experience in doing so  They were not actually crystals to begin with  None of the crystals were native to the moon