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'crystal growth habits 5:335h passim to 336h ~jcwelry-making gem—carving
processes 10:166d facet, nearly plane surface on a rock caused by abrasion.
sandblasting effects on rock surfaces 19:844b Fa-ch'ang (Buddhist painter): see ...
The feldspars strxc to classify igneous rocks because they occur in many different
kinds of rocks and because they crystallize from silica melts in a definite
sequence (see Bowen's reaction series). In addition to igneous rocks, feldspars
occur in ...
In the U.S. these are known from New England; they occur in smaller bodies at
numerous sites in British Tertiary rocks and in the Oslo region of Norway, but their
most extensive development is in northern Nigeria. Rocks containing less than ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review