[CITATION][C] Simpsonite and other ranralates from Bikita, southern Rhodesia
AM MecGnecon - Mineral. Moo, 1946
[PDF][PDF] Puvsrcel Pnopnnrrts: Colorless. G.: 7.10 to 7.30. H.: 6i to 7. Fracture irregular; cleavage basal, good. Optically uniaxial, negative, with n approximately 2 and bire
PF Knnn - 1915 - minsocam.org
… Drscussror: Calogerasite is undoubtedly identical with simpsonite from Tabba Tabba, Australia,
… Bowley's statement that simpsonite is optically positive is incorrect. The name simpsonite …
… Bowley's statement that simpsonite is optically positive is incorrect. The name simpsonite …
Atomic structure holography using thermal neutrons
B Sur, RB Rogge, RP Hammond, VNP Anghel… - Nature, 2001 - nature.com
… of natural simpsonite, a rare oxide mineral of aluminium and tantalum with chemical formula
Al 4 Ta 3 O 13 (OH). Simpsonite … We also thank TS Ecrit for providing the simpsonite crystal. …
Al 4 Ta 3 O 13 (OH). Simpsonite … We also thank TS Ecrit for providing the simpsonite crystal. …
Alumotantite and natrotantite, new tantalum minerals in granitic pegmatites
AV Voloshin, YP Men'shikov… - International Geology …, 1982 - Taylor & Francis
… The reflectance of alumotantite is higher than that of simpsonite; characteristically the aniso…
In distinction from simpsonite, which also shines blue in cathode rays, the luminescence of …
In distinction from simpsonite, which also shines blue in cathode rays, the luminescence of …
[HTML][HTML] Sur un terme plombifère du groupe pyrochlore-microlite
A Safiannikoff, L Van Wambeke - Bulletin de Minéralogie, 1961 - persee.fr
… This mineral is associated with cassiterite, manganotantalite, microlite and simpsonite. It … ,
à de la microlite et à de la simpsonite. Il se présente en masses cristallines de couleur jaune à …
à de la microlite et à de la simpsonite. Il se présente en masses cristallines de couleur jaune à …
[PDF][PDF] Rankamaite, a new tantalum mineral from Kivu, Congo
O von Knorring, A Vorma… - Bulletin of the …, 1969 - pdfs.semanticscholar.org
… Safiannikoff concludes that the fibrous mineral which is associated with the viterous
simpsonite is similar to simpsonite in composition but contains a higher proportion of niobium. No …
simpsonite is similar to simpsonite in composition but contains a higher proportion of niobium. No …
[HTML][HTML] On the mineralogy and geochemistry of niobium and tantalum in some granite pegmatites and alkali granites of Africa
O von Knorring, A Fadipe - Bulletin de Minéralogie, 1981 - persee.fr
… Only waterworn pebbles of rankamaite have been found and the mineral constitutes the
fibrous matrix in which corroded remnants of simpsonite, minute grains of cassiterite and …
fibrous matrix in which corroded remnants of simpsonite, minute grains of cassiterite and …
The philadelphia mineralogical society.
JS Frankenfield - American Mineralogist: Journal of Earth …, 1945 - pubs.geoscienceworld.org
… Drscussror: Calogerasite is undoubtedly identical with simpsonite from Tabba Tabba, Australia,
… Bowley's statement that simpsonite is optically positive is incorrect. The name simpsonite …
… Bowley's statement that simpsonite is optically positive is incorrect. The name simpsonite …
Bahianite, Sb3Al5O14 (OH) 2, a new species
PB Moore, C do Prado Barbosa… - Mineralogical …, 1978 - cambridge.org
… It is related to the structure of simpsonite TaaAI4013(OH). … Like simpsonite, bahianite is
variable in composition and this results from both substitution over the four non-equivalent …
variable in composition and this results from both substitution over the four non-equivalent …
Recent mineral occurrences from Northeastern Brazil
R Wegner - Mineralogical Record, 2000 - search.proquest.com
… The Alto des Furnas pegmatite also produced manganotantalite pseudomorphs after
simpsonite up to 5 cm across. Some of these pseudomorphs are quite sharp and are intergrown …
simpsonite up to 5 cm across. Some of these pseudomorphs are quite sharp and are intergrown …