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"--THE AMERICAN GENEALOGIST
GESELLCHEN
Fromme Bait Co
Charles Schif
industrial equipment
Collector's Guide to the Feldspar Group by Robert J. Lauf "--THE AMERICAN GENEALOGISTOver 100 vivid color photographs of beautiful feldspar minerals show each species in its geological context. The feldspar minerals, as a group, make up nearly sixty percent of the earth's crust. Large crystals are found at many locales worldwide, in both igneous and metamorphic rocks. Often, feldspar forms the matrix for stunning gem crystals found in pegmatites. This book explains how feldspars are formed and the complicated structural features that
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