Madagascar,Tourmaline,2004,ggg education Madagascar Tourmaline
Some forms of parent involvement with the school such as communications with school, volunteering, attending school events and parent--parent connections appeared to have little effect on student achievement, especially in high school. Helpi Translation jobs are undertaken by professional translators who are well versed with at least two languages.Translation can work at two levels: inter-state or regional language translation and inter-national or foreign language translation.
© 2004 gggems.com All rights reserved. (Na, Li,Ca) (Fe2, Mg, Mn, Al)3 Al6 I(OH)4 I (BO3)3ISi6O18I · Crystallographic properties: Trigonal. Hardness 7 - 7.5 Density 3.02 to 3.26 Refractive index: 1.62 - 1.64 · Chemical Properties: Alumina borosilicate with fluorine. Occurences: In the acid magmatic rocks and associated pegmatites, limestones and schists, placers. Coloured tourmalines are related to sodolithic pegmatites. One distinguishes two principal types of tourmalines: the hexagonal type and the triangular one. · The hexagonal type is especially characterized by the presence, in the prismatic zone, of the well developed S1 faces, and those of L always narrow. When the crystals Bi-terminated, one finds with the one of the ends of the ternary axis the rhomboedron R, and with the other same the rhomboedron combined with that (0111) = P. · The triangular type, here is never finished at the two ends, it is characterized by the prevalence of faces I in the prismatic zone, while those S are very narrow just as those S2 which accompany them. The crystals on the finished end carry the base C, combined with the rhomboedron R; in the same way sometimes with the rhomboedron P and the base C 1 2 3 4 Fig. 1& 2 : Triangular type Fig. 3 & 4 :Hexagonal type Very rare type of Rubellite from Antsongombato tourmaline: white head and red body. 5 6 Crystal of the hexagonal type finished Polychrome tourmaline being in Tsilaizina, Madagascar. at a peak frequently found in Tsilaisina. Liddicoatite Tourmaline Deep-PinkTourmaline Blue-greenTourmaline. Indigolite from Anjanabonoina. Antsongombato type. ( Kunar valley, Afghanistan.) · Colors of tourmalines: Blue is due to bivalent iron, (magnesium gives a clearer blue) the manganese produce tone from pink to red, chromium and vanadium is in green tourmalines, the yellow and the brown one is produced by trivalent iron. Diagrammatic provision Growth zoning and geometrical drawings in a SLICED TOURMALINE of a complete crystal cut tourmaline sliced in section from Vohitrakanga. parallel to the ternary axis. Rubellite Chrome Tourmalines Indigolite from Anjahamiary. Macle of green tourmaline Antsongombato type. from Tsaniria. ( Madagascar ) Estaknala ( Pakistan ) ( Madagascar ) ( Madagascar ) Sketch of the Antsongombato mine ( Antsirabe area) at the beginning of the 20th century. The attack Mine of Alakamisy Itenina ( Fianarantsoa area). measured about fifteen meters, the coal face was to This mine is worked in alluvium, the first stones were hillside 10 meters above the brook, it showed the discovered in 1989 in a rice plantation. It produced presence of a large sill of hard pegmatite, laid out in rubellites and remarkable tourmalines with geometrical benches lities by a secondary cleavage. To the wall drawings. one sees a schistous limestone greenish and broken up, to the roof, one distinguishes only clay. This deposit was famous for its red-ruby tourmalines. The Mine of Anjanabonoina, located in the high plateaus, produced rubellites, green tourmalines, brown-orange, pink, blue-sky, purple, and a variety of rare stones since the end of the 19th century. This deposit is elluvial. ¦ Cutting Styles ¦ Characteristics ¦ Crystalline Systems ¦ Madagascar Sapphire ¦ ¦ Tourmaline Polychrome ¦ Tourmaline Crystal ¦ Tourmaline Crystal 2 ¦ Tourmaline Slice ¦ Your guide to GGGems All the pictures on this site have been shot by gggems.com Alain Darbellay © 1987 - 2004 gggems.com All rights reserved.
Madagascar,Tourmaline,2004,ggg