IMA 2018-080 = okieite

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Marco E. Ciriotti
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IMA 2018-080 = okieite

Messaggio da Marco E. Ciriotti » gio 07 nov, 2019 11:36

Prossima pubblicazione.

Referenza:
▪ Kampf, A.R., Adams, P.M., Nash, B.P., Marty, J., Hughes, J. (2020): Okieite, Mg3[V10O28]·28H2O, a new decavanadate mineral from the Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA. Canadian Mineralogist, 58, (in press).
Marco E. Ciriotti

«Things are interesting only in so far as they relate themselves to other things»

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Marco E. Ciriotti
Messaggi: 26873
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2018-080 = okieite

Messaggio da Marco E. Ciriotti » lun 20 gen, 2020 17:49

Pubblicazione effettuata.

Referenza:
▪ Kampf, A.R., Adams, P.M., Nash, B.P., Marty, J., Hughes, J. (2020): Okieite, Mg3[V10O28]·28H2O, a new decavanadate mineral from the Burro Mine, Slick Rock Mining District, San Miguel County, Colorado, USA. Canadian Mineralogist, 58, 125-135.

Abstract:
Okieite, Mg3[V10O28]·28H2O, is a new decavanadate mineral from the Burro mine, Slick Rock district, San Miguel County, Colorado, USA (type locality); the mineral is also found at the Hummer mine, Paradox Valley, Montrose County, also in Colorado. The mineral is rare; it occurs with dickthomssenite on montroseite- and corvusite-bearing sandstone. Crystals of okieite from the Burro mine are equant to prismatic, commonly appearing like curving columns (up to about 3 mm in length) and often exhibiting rounded faces. The streak of okieite is light orange yellow, and the luster is vitreous. The Mohs hardness is ca. 1½, the tenacity is brittle, the fracture is curved or conchoidal, there is no cleavage, and the measured density is 2.20(2) g/cm3. Okieite is biaxial (–), with α = 1.720(3), β = 1.745(3), γ = 1.765(3) (white light); 2V = 84(2)° with strong r < v dispersion. The optical orientation is X ^ a = 37°, Y ^ c = 28°, Z ^ b = 31°. No pleochroism is observed in okieite. The empirical formula from electron-probe microanalysis (calculated on the basis of V = 10 and O = 56 apfu as indicated by the structure) is Mg2.86[H0.28V5+10O28]·28H2O. Okieite is triclinic, P-1⁠, with a 10.55660(19), b 10.7566(2), c 21.3555(15)Å, α 90.015(6), β 97.795(7), γ 104.337(7)°, and V 2326.30(19)Å3, as determined by single-crystal X-ray diffractometry. The strongest four diffraction lines in the powder diffractograms are [d in Å(I)(hkl)]: 9.71(100)(-101, 0-11, 011, 101)⁠; 8.32(19) (-110)⁠; 11.04(17)(002); and 6.42(12)(110, -1-11, 1-12)⁠. The atomic arrangement of okieite [R1 = 0.0352 for 11,327 I > 2σI reflections] consists of a {V10O28}6– (decavanadate) structural unit and a {[Mg(H2O)6]3·10H2O}6+ interstitial complex. Only hydrogen bonding links the structural unit with the components of the interstitial complex. Okieite is isostructural with synthetic Mg3[V10O28]·28H2O. The name okieite is for Craig (“Okie”) Howell of Naturita, Colorado.
Marco E. Ciriotti

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