IMA 2016-082 = redcanyonite

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Marco E. Ciriotti
Messaggi: 24899
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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IMA 2016-082 = redcanyonite

Messaggio da Marco E. Ciriotti » ven 18 mag, 2018 18:09

Prossima pubblicazione.

Referenza:
▪ Olds, T.A., Plášil, J., Kampf, A.R., Burns, P.C., Nash, B.P., Marty, J., Rose, T.P., Carlson, S.M. (2018): Redcanyonite, (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4, a new zippeite group mineral from the Blue Lizard Mine, San Juan County, Utah, USA. Mineralogical Magazine, 82, (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: 24899
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2016-082 = redcanyonite

Messaggio da Marco E. Ciriotti » sab 10 nov, 2018 13:46

Referenza:
▪ Olds, T.A., Plášil, J., Kampf, A.R., Burns, P.C., Nash, B.P., Marty, J., Rose, T.P., Carlson, S.M. (2018): Redcanyonite, (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4, a new zippeite group mineral from the Blue Lizard Mine, San Juan County, Utah, USA. Mineralogical Magazine, 82, (in press).

Abstract:
Redcanyonite (IMA2016-082), (NH4)2Mn[(UO2)4O4(SO4)2](H2O)4, occurs underground in the Blue Lizard mine, Red Canyon, White Canyon district, San Juan County, Utah, USA. It occurs with natrozippeite, brochantite, devilline, posnjakite, johannite, gypsum, bobcookite, pickingerite, pentahydrite, and the NH4-analog of zippeite, ammoniozippeite. Redcanyonite occurs as radial aggregates of red-orange needles and blades individually reaching up to 0.2 mm in length, with aggregates measuring up to 1 mm in diameter. Crystals are flattened on {010} and elongated along [100], exhibit perfect cleavage on {010}, and exhibit the forms {010}, {001}, {101}, and {10-1}. Twinning is ubiquitous, by 180° rotation on [100]. Redcanyonite is translucent with a pale orange streak, is nonfluorescent, has a hardness of 2 (Mohs), and has brittle tenacity with uneven fracture. Optically, redcanyonite is biaxial (+), α = 1.725(3), β = 1.755(3), γ = 1.850(5) (white light); 2V (meas.) = 60(2)°, 2V (calc.) = 61.3°; dispersion is r < v, very strong. Pleochroism: X = orange, Y = yellow, and Z = orange; Y << X < Z. The optical orientation is X = b, Y ≈ c*, Z ≈ a. The empirical formula is (NH4)2.02(Mn0.49Cu0.09Zn0.06)Σ0.64H+0.72[(UO2)4O4(S0.99P0.01O4)2](H2O)4, based on 4 U and 24 O apfu. Redcanyonite is monoclinic, C2/m, a = 8.6572(17), b = 14.155(3), c = 8.8430(19) Å, β = 104.117(18)°, V = 1050.9(4) Å3 and Z = 2. The structure was refined to R1 = 0.0382 for 1079 reflections with Iobs > 3σI. Uranyl oxo-sulfate sheets in redcanyonite adopt the well-known zippeite topology, which consists of zig-zag chains of uranyl pentagonal bipyramids linked by sulfate tetrahedra to form sheets. The sheets are linked to each other through bonds to interlayer NH4+ groups and octahedrally coordinated Mn2+, and by hydrogen-bonds from H2O groups. Redcanyonite is named for Red Canyon in southeast Utah, USA.
Marco E. Ciriotti

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