Over 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
create fine crystals, twins, and vivid colors. After a brief
introduction, the general treatment begins with an explanation of
the chemistry and taxonomy of the group. A section on their
formation and geochemistry explains the kinds of environments where
feldspars are formed. Detailed entries for each mineral provide
locality information and full-color photos so that collectors can
see what good specimens look like and which minerals one might
expect to find in association with them. An extensive bibliography
is provided for further study.
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