Granitic pegmatites are usually associated with large granite stocks, masses, and batholiths, as in New England, the Black Hills of South Dakota, and Governador Valadares in the state of Minas Gerais, Brazil. Compositionally, the pegmatites consist of the feldspars, quartz, and muscovite with local concentrations of accessory minerals such as beryl , spodumene , tourmaline , columbite -tantalite, triphylite-lithiophilite, amblygonite , and minor sulfides and arsenides. Although the bulk composition reflects that of the parent granite, important differences prevail. Pegmatites usually afford a deficit of Ti4+ with respect to the granite, and the Mn/Fe ratios in accessory phases are much greater, with values in the latter ranging from 0.10 to 0.95. The range Mn/Fe = 0.20–0.40 is most frequently encountered. In addition, local concentration of minor to trace–quantity elements is encountered, such as Li1+, Fe2+, B3+, P5+, Nb5+ and Ta5+. As with granites, the pegmatites are depleted in Cr3+...
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Cross-references
Collecting Minerals; Museums, Mineralogical; Rock-Forming Minerals; Vein Minerals; see also mineral glossary and individual mineral groups.
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Moore, P.B. (1981). Pegmatite minerals . In: Mineralogy. Encyclopedia of Earth Science. Springer, Boston, MA. https://doi.org/10.1007/0-387-30720-6_98
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