Crystal structure and chemistry of lithium-bearing trioctahedral micas-3T
Abstract:Chemical analyses and crystal structure refinements were performed on lithian siderophyllite-3T crystals from granitic pegmatites of the anorogenic Pikes Peak batholith (Colorado) to characterize the crystal chemistry and relations with trioctahedral lithium-bearing micas showing different stacking sequences. Chemical data show that the studied samples fall on the siderophyllite polylithionite join, closer to the siderophyllite end-member. Single-crystal X-ray refinements were carried out on three samples (two of which were taken from core and rim of the same crystal) in space-group P3112 (the agreement factor, R obs, varies between 0.034 and 0.036).Mean bond distances and mean electron counts of M1, M2 and M3 octahedral sites indicate an orderedcation distribution with M1 and M3 positions substantially larger than M2. In the sample with the largest iron content, the M2 mean electron count increases aswell as the
Document Type: Research Article
Publication date: 2003-04-01
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