 | | Journal (article/letter/editorial) | | cassiterite and numerous Nb, Ta-oxide minerals. At Lutsiro pegmatite, foordite is replaced by mosaic fine-grained...aggregate of secondary foordite-thoreaulite + columbite-tantalite + Ta-rich cassiterite. Simpsonite is...Key-words: foordite, thoreaulite, cassiterite, columbite, tantalite, simpsonite, alkali-bearing Nb-Ta minerals...(Buttgenbach, 1933). Later, thoreaulite from Lutsiro, Rwanda, was shown to have Nb/Ta at. ratio > 1 (Thoreau...of cassiterite plus columbite after primary foordite from Lutsiro pegmatite, Rwanda, was described by Černý |  | | Book | | MINERALS& GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published...East African resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties...is not commonly known that neighbouring Uganda, Rwanda and Burundi are also sources of some interesting...the gem-quality tourmaline that can be found in Rwanda). Literature on the subject is limited; the previous...of the five featured countries - Burundi, Kenya, Rwanda, Tanzania and Uganda - and introduces the reader |  | | Book (edition) | | overgrowth by its darker colour that relates to its higher Fe content and its hexagonal shape, while it is completely...end-member compositions; another example is Mg and Fe in olivine. Crystallographic System & Point Group...to darker brown internal reflections) in a massive Fe-poor sphalerite (orange internal reflections), jordanite...rutile, and ulvöspinel separating from ilmenite). Fe-, Cu-, and Ag-containing sulfides are even more out...interstitial space. Examples include various Cr, Fe, and Ti oxides as well as sulfides, the latter crystallizing |  | | Book (edition) | | Platinum Potassium Praseodymium Radium Radon H In I Ir Fe Kr La Pb Li Lu Mg Mn Hg Mo Nd Ne Ni Nb N Os 0 Pd...Cand CSPG Pennskiye gubemskiye wdomo.sti (Perm district ga=elle) Pl,ilosopl,ical Maga=ine Periodico de...Obshchestva xiv A □ Abclsonite, CJ1H32N4 Ni, tric., Western Oil Shale Corporation drill core WOSCO, Sec 36...Big Pack Mountain, northeast Quadrangle, Green River Formations, near Dragon, Uintah County. Utah, USA...Rafael swell about 47 miles southwest of Green River, Emery County, Utah, USA, 41. 82-90, 49, 1578-1602 |
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