 | | Report (issue) | | Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O Oxy-dravite Crystal Data: Hexagonal. Point Group: 3m. As prismatic...2001(1) Z=3 X-ray Powder Pattern: Osarara, Narok district, Kenya. 2.963 (100), 3.483 (84), 2.576 (68)...(1) 8.56 2.65 0.10 [2.65] 101.58 (1) Osarara, Narok district, Kenya; average of 10 electron microprobe...& Series: Oxy-dravite is related to oxy-schorl, oxy-chromium-dravite, oxy-vanadium-dravite, and povondraite...muscovite. Distribution: From Osarara, Narok district, Kenya. Name: As a dravite with Al3+ + O2– → Mg2+ + |  | | Journal (article/letter/editorial) | | Mineralogist, Volume 98, pages 1442–1448, 2013 Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, a new...50007, SE-10405 Stockholm, Sweden 2 Abstract Oxy-dravite, Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O, is a new...of Osarara (Narok district, Kenya) and occurs in quartz-muscovite schist. Crystals of oxy-dravite are...density of 3.073 g/cm3. In plane-polarized light, oxy-dravite is pleochroic (O = orange and E = pink) and uniaxial...uniaxial negative: ω = 1.650(5), ε = 1.620(5). Oxy-dravite is rhombohedral, space group R3m, with the unit-cell |  | | Journal (article/letter/editorial) | | 1007/s00269-015-0743-z ORIGINAL PAPER Spectroscopy of red dravite from northern Tanzania Michail N. Taran1 · M. Darby...Springer-Verlag Berlin Heidelberg 2015 Abstract Low-Fe dravite with a formula of Na0.66Ca0.16 Mg2.62Fe0.33Mn0...Sambu may be found to be marked as belonging to Kenya, but in reality, it is located near the border in...distinctly different from the red dravite from the Osarara, Narok district, in Kenya that was formerly studied...heat treatments for color enhancement. Keywords Dravite · Tourmaline · Optical spectroscopy · Mössbauer |  | | Journal (article/letter/editorial) | | single-crystal neutron diffraction study of oxy-dravite G. D. GATTA1,*, F. BOSI2,3, G. J. MCINTYRE4 1...neutron diffraction study of oxy-dravite from Osarara (Narok district, Kenya) was performed. Intensity data...measured by infrared spectroscopy. K EY WORDS : oxy-dravite, tourmaline, crystal chemistry, neutron Laue...multi-methodological study on oxydravite from Osarara (Narok district, Kenya), based on single-crystal X-ray diffraction...spectroscopy (UV/VIS). The empirical formula of the Osarara oxy-dravite is as follows: X (Na0.83&0.15K0.02)S1.00 |  | | Journal (article/letter/editorial) | | (H2O) Mammoth-Saint Anthony mine, Tiger, Pinal County, Arizona, USA (32º42’23’’N 110º40’59’’W) Anthony...Department, Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers...collections of the Natural History Museum of Los Angeles County, Los Angeles, California, USA, catalogue numbers...West Sunday mine, Slick Rock district, San Miguel County, Colorado, USA Anthony R. Kampf*, Joe Marty, Barbara...collections of the Natural History Museum of Los Angeles County, Los Angeles, CA 90007, USA, catalogue numbers |  | Ertl, Andreas, Baksheev, Ivan A., Giester, Gerald, Lengauer, Christian L., Yu. Prokofiev, Vsevolod, Zorina, Lidiya D. (2016) Bosiite, NaFe3+ 3(Al4Mg2)(Si6O18)(BO3)3(OH)3O, a new ferric member of the tourmaline supergroup from the Darasun gold deposit, Transbaikalia, Russia. European Journal of Mineralogy, 28 (3) 581-591 doi:10.1127/ejm/2016/0028-2540 | Journal (article/letter/editorial) | | followed by a second generation of oxy-dravite and a third generation of dravite. Bosiite also coexists with...ZAl4 → ZFe3+4. Further, bosiite is related to oxy-dravite, ideally Na(Al2Mg)(Al5Mg)(Si6O18)(BO3)3(OH)3O...Fe-bearing dravite in Darasun, whereas in the Western Carpathians it evolved from schorl–dravite to povondraite...4) of a new tourmaline (recently described as oxy-dravite by Bosi & Skogby, Fig. 1. Black bosiite aggregates...supergroup Fig. 2. Photograph of bosiite and oxy-dravite from the Darasun gold deposit (field of view ~3×4 |  | Bosi, Ferdinando, Reznitskii, Leonid, Hålenius, Ulf, Skogby, Henrik (2017) Crystal chemistry of Al–V–Cr oxy-tourmalines from Sludyanka complex, Lake Baikal, Russia. European Journal of Mineralogy, 29 (3) 457-472 doi:10.1127/ejm/2017/0029-2617 | Journal (article/letter/editorial) | | online 23 December 2016 Crystal chemistry of Al–V–Cr oxy-tourmalines from Sludyanka complex, Lake Baikal,...10405 Stockholm, Sweden Abstract: Twelve Al–V–Cr oxy-tourmalines from the Sludyanka crystalline complex...Mg)]–O3(O2)–Y(Cr), while the incorporation of V3þ into the oxy-tourmaline structure is controlled by the local arrangement...reliable guide to derive the composition of Al–V–Cr oxy-tourmalines from refractive-index measurements. Key-words:...with a statistically significant dataset of Al–V–Cr oxy-tourmalines is still missing. To explore the crystal-chemical |  | | Journal (article/letter/editorial) | | induced cation redistribution in Fe‑bearing oxy‑dravite and potential geothermometric implications Ferdinando...Berlin Heidelberg 2016 Abstract Iron-bearing oxy-dravite was thermally treated in air and hydrogen atmosphere...octahedrally coordinated Y and Z sites, an Fe3+-bearing oxy-dravite sample was thermally treated in air or hydrogen...respectively. The Fe3+-bearing oxy-dravite of the present study was taken from oxy-dravite holotype material and...refinement Crystal fragments of the heat-treated oxy-dravite (samples H2 and AIR) were selected for X-ray |  | | Book | | MINERALS& GEMSTONES of East Africa Burundi, Kenya, Rwanda, Tanzania and Uganda Bruce Cairncross Published...Africa 10 East African resources 12 Burundi 13 Kenya 14 Rwanda 16 Tanzania 17 Uganda 20 Gemological properties...through Tanzania, Kenya, Ethiopia and into the Sudan - has blessed East Africa, Kenya and Tanzania, with...now mainland Tanzania) and then progressing to Kenya - I am proud to say that the coloured gemstones...fact is that both of the national gemstones of Kenya and Tanzania (tsavorite and tanzanite, respectively) |  | | Book (edition) | | JMPS MM MP NJMA ZRMO Republic province prefecture county departement departamento ...19.99, 9.79, Chro1110-a/11111ino-povo11draite -dravite. 19.62, /J= 110°42', Z = 8. d: 9.3(10)- 9.1(10)-4... Morocco. AM 91, 2012. 1249-1270, 2006. Fluor-dravite NaMg 3AllFl(OH) 3l(B0 3) 31Si6O1J Fluorbritholite-(Y)...4.2(7) - 4.0(7)- 2.97(10) 2.04(8). Similar to dravite,. brown, blackish brown to France black, transparent...mibia, and from Maikain, Pavlodar dist., Kazakhstan. Oxy-schorl Na(Fei 3+Al)Al6 [Ol(OHMBO3)3ISi6O1s] (9.C |
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