...Hong Zheng; Sturges W. Bailey Abstract The crystal structure of manandonite-2 H 2 , an Al-, Li-, B-rich analogue of amesite, has been refined in space group C 1 to R = 5.7%. Tetrahedral Si, Al, and B are partly ordered to give two mean T-O bond lengths near 1.603(1) Å and two near 1.667(1) Å. B has...

...F igure 3. Unit-cell dimensions vs. boron contents in tetrahedra of borocookeite, boron-bearing cookeites, and manandonite. The numbers correspond to the sample numbers in Table 1 . ...

...), steeply dipping dike. It is the type locality for manandonite ( Lacroix, 1912 ) and londonite ( Simmons et al. , 2001 ). What would become the type material was submitted for identification to one of us at a mineral show by a French dealer. The circumstances of the find are unfortunately unknown...

... the crystallographic site of silicon (Si) or aluminum (Al). In sheet silicates like borocookeite (a chlorite group mineral) and boromuscovite (mica group mineral), B 3+ partly replaces Al in tetrahedral coordination ( [4] Al 3+ ) ( Foord et al. 1991 ; Zagorsky et al. 2003 ), whereas in manandonite (another chlorite...

...-Antsirabé region, Antananarivo Province, Madagascar, is located in the Sahatany Pegmatite Field. Gem tourmaline (elbaite) has been mined in this marble-hosted, complex lithium–cesium–tantalum-type pegmatite since about 1900. Associated minerals are albite, microcline, quartz, spodumene, manandonite, bityite...

... (OH) 4 (7) OXID,HYDR,WEAT—Zn-bearing rocks 31 21. Manandonite Li 2 Al 4 (Si 2 AlB)O 10 (OH) 8 (4) HYDR,WEAT—complex Li-B pegmatites 32 Talc group (10 Å trioctahedral, non-expandable 2:1 layer structure; no interlayer cations) 22. Talc Mg 3 Si 4 O 10 (OH) 2 3 HYDR—olivines...

... with minor spodumene and/or lepidolite suggest dominance of elbaite-subtype pegmatites tending locally to spodumene or lepidolite subtypes, respectively. The local presence of borates such as hambergite, béhierite, and rhodizite-londonite, or borosilicates such as danburite, dumortierite, and manandonite...

...-dynamics Tables. A set of Prototype Tables . Codata Bulletin , 7X , 113 pp. Lacroix , A. ( 1915 ) Manandonite et cookeite . Bulletin de la Société française de Minéralogie et Cristallographie , 38 , 142 – 149 . Lin , F.C. and Clemency , C.V. ( 1981 ) The kinetics...