http://www.cnr.it/ontology/cnr/individuo/prodotto/ID29174

Dellaventuraite, NaNa2(MgMn32+Ti 4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri manganese mine, Jhabua district, Madhya Pradesh, India. (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Dellaventuraite, NaNa2(MgMn32+Ti 4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri manganese mine, Jhabua district, Madhya Pradesh, India. (Articolo in rivista) (literal)

Anno

2005-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.2138/am.2005.1659 (literal)

Alternative label

Tait K.T.; Hawthorne F.C.; Grice J.D.; Ottolini L.; Nayak V.K. (2005)
Dellaventuraite, NaNa2(MgMn32+Ti 4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri manganese mine, Jhabua district, Madhya Pradesh, India.
in The American mineralogist; Mineralogical Society of America, Washington (Italia)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Tait K.T.; Hawthorne F.C.; Grice J.D.; Ottolini L.; Nayak V.K. (literal)

Pagina inizio

304 (literal)

Pagina fine

309 (literal)

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90 (literal)

Rivista

?The ?American mineralogist (Rivista)

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2-3 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

Tait K.T. 1), Hawthorne F.C. 1), Grice J.D. 2), Ottolini L. 3), Nayak V.K. 4). 1) Univ Manitoba, Dept Geol Sci, Winnipeg, MB R3T 2N2, Canada 2) Canadian Museum Nat, Div Res, Ottawa, ON K1P 6P4, Canada 3) CNR, Ist Geosci & Georisorse, Sez Pavia, I-27100 Pavia, Italy 4) H-21 Gitanjali Complex, Shanti Vihar Colony, Makronia Camp, P.O. Box Saugar 470-004, India (literal)

Titolo

Dellaventuraite, NaNa2(MgMn32+Ti 4+Li)Si8O22O2, a new anhydrous amphibole from the Kajlidongri manganese mine, Jhabua district, Madhya Pradesh, India. (literal)

Abstract

Dellaventuraite is a new amphibole species from the Kajlidongri manganese mine, Jhabua District, Madhya Pradesh, India. It occurs with leakeite, kornite, albite, braunite, and bixbyite associated with cross-cutting epigenetic veins that have reacted with regionally metamorphosed rocks containing Mn-rich minerals (braunite, bixbyite, jacobsite, spessartine) to produce Mn-rich amphiboles, Mn-rich pyroxenes, Mn-rich mica, piemontite, and manganophyllite. Dellaventuraite occurs as anhedral grains, the color of which varies from pink to red, depending on Mn content. It is brittle, H = 5, D-calc = 3.184 g/cm(3), has a pale pink streak, vitreous luster, and does not fluoresce in ultraviolet light; it has perfect cleavage on {110} and conchoidal fracture. In transmitted plane-polarized light, dellaventuraite is strongly pleochroic X = pale mauve-brown, Y similar to Z = dark red-brown; Y <^> a = 20degrees (in beta obtuse), Z = b, with absorption X < Y similar to Z. It is biaxial positive, eta(alpha) = 1.688 +/- 0.0003, eta(beta) = 1.692 +/- 0.005, eta(gamma) = 1.721 +/- 0.003, 2V((obs)) = 49 +/- 3degrees, 2V((calc)) = 41degrees. Dellaventuraite is monoclinic, space group C2/m, a = 9.808(1), b = 17.840(2), c = 5.2848(5) Angstrom, gamma = 104.653(1)degrees, V = 894.6(2) Angstrom(3), Z = 2. The strongest ten X-ray diffraction lines in the powder pattern are [d(l,hkl)]: 2.697(10,151), 2.542(9,-202), 3.127(8,310), 3.378(7,131),2.154(7,261),1.434 (7,-661),4.450(6,021), 8.459(5,110), 2.727(5,-331),2.328(5,-351). Analysis by a combination of electron microprobe, SIMS and crystal-structure refinement gives SiO2 = 54.22, Al2O3 = 0.81, TiO2 = 5.45, Fe2O3 = 6.44, Mn2O3 = 7.57, ZnO = 0.12, NiO = 0.16, MgO = 8.26, Li2O = 1.53, CaO = 1.85, Na2O = 8.12, K2O = 2.12, H2O = 0.80, Cr, V, F, Cl not detected, sum 97.41 wt%. The formula unit, calculated on the basis of 24(O,OH,F) is (K0.40Na0.61)(Na1.71Ca0.29) (Mg1.81Zn0.01Ni0.002Li0.90Fe0.713+Mn0.853+Ti0.604+Al0.10)(Si7.96Al0.04)O-22[(OH0.80 O-1.20]; the ideal end-member compostion NaNa2(MgMn23+LiTi4+)Si8O22O2. The crystal structure of dellaventuraite was refined to an R index of 3.8% using MoKalpha. X-ray intensity data. The M1 site is occupied by Ti4+, Mn3+, and Mg in approximately equal amounts, the M2 site is occupied primarily by Mg and Fe3+, and M3 is occupied by Li with minor Mg and Mn2+. Local bond-valence considerations suggest that O2- at O3 is linked to Ti4+Mg or Mn3+Mn3+ at the adjacent M I sites, and that OH at O3 is linked to MgMg at the adjacent M1 sites. (literal)

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