& Richard W. Hazlett, Joshua Tree National Park Geology, Joshua Tree National Park Association, 2002. Waymark is … The Upper Putnam pegmatite in Haywood County elevated xenoliths of aplitic granodiorite, several inches to … However, individual dikes display a wide range in grain size. Iberian Zone may be classified into four types: aplite-pegmatite dykes occurring in pegmatitic fields, Li mineralization associated with leucogranitic cupolas, beryl-phosphate pegmatites and quartz-montebrasite veins. Abundant Li-Cs-Ta aplite-pegmatite dykes were emplaced in the western Central Iberian Zone of the Iberian Massif during the Variscan Orogeny. All 3 are igneous in nature and shares like minerals. Granite, aplite, and pegmatite. Unpublished Ph.D. thesis, Stanford University, Stanford, CA, 326 p. (5) A very fine-grained felsitic aplite also developed locally from the gas phase, as the result of a “pressure quench” where increments of the gas phase were able to escape from the system. COMPOSITE APLITE-PEGMATITES 1685 At several localities pegmatites that were intruded into gneisses car-ried up with them angular xenoliths of aplitic tonalite or granodiorite. Pegmatite-aplite dikes typically have a finegrained footwall, coarse-grained hanging wall, and a core zone with miarolitic cavities. Their origin and petrogenetic relationships with the widespread granitoids have led to a currently rekindled discussion about anatectic vs. granitic origin for the pegmatitic melts. FOORD, E. E. (1976) Mineralogy and petrogenesis of layered pegmatite-aplite dikes in the Mesa Grande district, San Diego County, California.. PEGMATITE, SILEXITE, AND APLITE IN THE GRANITES OF THE LYON MOUNTAIN QUADRANGLE The granites.-Several varieties of granite and granitic syenite constitute the main bulk of the rocks of this district. The genetic relationship between a granite pluton and adjacent complex of rare-metal pegmatite-aplite-banded sheets (Megiliggar Sheet Complex - MSC) has been studied at the border of the Tregonning topaz granite at Megiliggar Rocks, Cornwall, SW England. Pegmatite crystal texture form within pegmatitic rock may be taken to extreme size and perfection. This is a drive by cache and can only be seen heading south. The structure and look of this cliff probably formed at the same time. Tom Frost, USGS geologist directed me to this visual striking site and gave me a brief description of what happened. The following sources were used to generate this cache: Trent, D.D. Feldspar within a pegmatite may display exaggerated and perfect twinning, exsolution lamellae, and when affected by hydrous crystallization, macroscale graphic texture is known, with feldspar and quartz intergrown. The only difference between the pegmatite and aplite are the crystal sizes. 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