 | | Journal (article/letter/editorial) | | AND PHYSICAL PROPERTIES OF TOURMALINE WITH ITS POSITION IN THE PEGMATITE* M. H. Staetz, K. J. MunarA...AesrRAcr Tourmaline crystals of the bizonal, Iepidolite-bearing Brown Derby pegmatites no. 2 and no. 3 of Gunnison...Gunnison County, Colo., show a consistent variation in color, refractive index, and composition wittr...wittr position in the pegmatite. Starting with the outer wall of the pegmatite and going inward toward the...the core, the colors of the tourmaline crystals are black, dark green, blue, light green, and pink. The |  | | Journal (article/letter/editorial) | | structure of an alkali cation-deflcient, vanadium tourmaline has been refined (R : 0.Ml for 2727 rntensitydata)...evaluatethe effectsof tourmaline composition on structural distortion. V-tourmaline, (Nao*Ca.r"Mgo.,rIGor)(Mg...membersof the tourmaline group, most notably a recently refined aluminousdravite. Analysis of tourmaline-groupstructural...octahedralanglevariancesand mean 9b-O bond length; (3) a negativecorrelation betweenditrigonality and 9b...betweenthe sizesof the 9b and l8c octahedrain refined tourmaline structures and the extensive and possibly complete |
|
