 | | Journal (article/letter/editorial) | | ARTICLE Tantalite-(Mn) from the Borborema Pegmatite Province, northeastern Brazil: conditions of formation...tantalite-(Mn) from the Alto do Giz pegmatite in the Borborema Pegmatite Province, northeastern Brazil were...crystals. The results demonstrate that in the Alto do Giz pegmatite, water- and alkaline carbonate-rich fluids...responsible for the transport and deposition of tantalite-(Mn) at temperatures around 600°C and about 4 kbar. Moreover...show that during crystallization of the tantalite(Mn), three different components coexisted, which are |  | | Report (issue) | | Mn2+Ta2O6 Tantalite-(Mn) Crystal Data: Orthorhombic. Point Group: 2/m 2/m 2/m. [Crystals short prismatic...subparallel crystals; massive] (by analogy to columbite-(Fe)). Twinning: [On {021} and {023}, may produce...5.0930(9) Z = 4 X-ray Powder Pattern: Salinas, Brazil. 2.99 (10), 3.69 (9), 2.41 (7), 1.738 (7), 1.483...Series: Dimorphous with tapiolite-(Mn); forms series, with columbite-(Mn), and with tantalite-(Fe) and tantalite-(Mg)...tantalite-(Mg). Mineral Group: Columbite group. Occurrence: An accessory and primary constituent of granite |  | | Book | | BARTORELLI ::• . . .. MINERALS & PRECIOUS STONES OF BRAZIL Sponsored by: VALE MINISTER.IO DA CULTURA ©...Crystal of multicolored tourmaline (84 x 26 mm), Lavra do Sapo, Ferruginha, Conselheiro Pena, Minas Gerais...(Camara Brasileira do Livro, SP, Brazil) Cornejo, Carlos .Minerals & precious stones of Brazil. Carlos Cornejo...pedras preciosas do Brasil Bibliography 1. Gemology 2. Geology 3. Minerals - Brazil 4. Minerals- Classification... Mineralogy 6. Mineralogy - Brazil - History 7. Precious stones - Brazil I. Bartorelli, Andrea. II. Title |  | | Journal (article/letter/editorial) | | data obtained from melt inclusions primarily in pegmatite quartz we have shown in this, and previous papers...system. This provides important evidence that pegmatite-forming processes have already begun at high temperatures...constraints of its own, so drawing conclusions about pegmatite-forming processes from data gained from slightly...Thomas at al. (2000) demonstrated for T the pegmatite-granite system from Ehrenfriedersdorf, Erzgebirge...However, an analysis of the inclusion diversity in pegmatite quartz clearly shows a vapor phase can also coexist |  | | Book (volume) | | and Peng Wenshi (1982). However, these publications do not contain any analytical data for reference samples...Н3О+, K, Sr, REE, Y, Ba, Mn, Ca; M(1) ¼ Ca, Mn, REE, Na, Sr, Fe; M(2) ¼ Fe, Mn, Na, Zr, Ta, Ti, K, Ba,...octahedron and major Mn–O-stretching band positions in IR spectra of tetravalent Mn oxides was obtained...data (open circles) and as ΣVIM2+ ¼ Ti + Nb + Mg + Mn + Fe + Zn 8 for samples with unknown structures...labuntsovite-Mn (19, 21, 23), vuoriyarvite-K (20), karupmøllerite-Ca (24), kuzmenkoite-Mn (25, 27, 30) |
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