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(W.S.MacK.) Feldspathoids The feldspathoids are a group of aluminosilicate
minerals that contain the alkali metal sodium and, in some varieties, potassium
and calcium. Because extensive chemical substitution occurs in natural
This article treats the crystal structure and physical and chemical properties of the
feldspathoids, as well as their occurrence in nature and laboratory synthesis. For
further information on crystal structure, see CRYSTALloGRAPHY, and for ...
Identification of feldspathoids Mineral stability fields Origin and distribution of
nepheline and analcime Famous feldspathoid localities. Figure 3: Scapolite
structure shown as two-dimensional projection. (See text for explanation of U, D,
and T.) ...
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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