FOORD, E. E. (1976) Mineralogy and petrogenesis of layered pegmatite-aplite dikes in the Mesa Grande district, San Diego County, California.. The main Li minerals of these bodies include Li-mica, spodumene and/or petalite in … 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. 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. Unpublished Ph.D. thesis, Stanford University, Stanford, CA, 326 p. The following sources were used to generate this cache: Trent, D.D. This is a drive by cache and can only be seen heading south. However, individual dikes display a wide range in grain size. Granite, aplite, and pegmatite. Waymark is … The structure and look of this cliff probably formed at the same time. (4) Granular pegmatite crystallized from the mobile, aqueous gas phase, after its accumulation in zones within the denser, supercooled liquid. 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. 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. Pegmatite-aplite dikes typically have a finegrained footwall, coarse-grained hanging wall, and a core zone with miarolitic cavities. (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. & Richard W. Hazlett, Joshua Tree National Park Geology, Joshua Tree National Park Association, 2002. All 3 are igneous in nature and shares like minerals. 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. 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 crystal texture form within pegmatitic rock may be taken to extreme size and perfection. Tom Frost, USGS geologist directed me to this visual striking site and gave me a brief description of what happened. 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