So from this single passage, I can then look up the geologic literature to determine if there is any place nearby where recent volcanic activity has occurred. I collected this specimen this past summer. The crystals were exposed by etching the calcite away with dilute hydrochloric acid. The best crystals of inesite from North America are found at the Hale Creek Mine. A local college library is the best place to obtain this information, followed by a public library.
College libraries tend to have a much more comprehensive array of references to review.
A quick review of the literature in the library can develop a large list of potential sites to visit. I collected this specimen during the late fall of 1994. This particular specimen was encased in a fairly ugly smokey quartz crystal. I have had good luck in the past with a little book work before getting into my 4x4 and heading for the great outdoors. You too can stumble across a forgotten treasure trove of minerals.