IMA 2015-023 = strontioperloffite

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Marco E. Ciriotti
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IMA 2015-023 = strontioperloffite

Messaggio da Marco E. Ciriotti » lun 17 dic, 2018 11:32

Prossima pubblicazione.

Referenza:
▪ Elliott, P. (2019): Strontioperloffite, SrMn2+2Fe3+2(PO4)3(OH)3, a new bjarebyite-group mineral from the Spring Creek mine, South Australia, Australia. European Journal of Mineralogy, 31, (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: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: IMA 2015-023 = strontioperloffite

Messaggio da Marco E. Ciriotti » gio 07 mag, 2020 11:21

Pubblicazione effettuata.

Referenza:
▪ Elliott, P. (2019): Strontioperloffite, SrMn2+2Fe3+2(PO4)3(OH)3, a new bjarebyite-group mineral from the Spring Creek mine, South Australia, Australia. European Journal of Mineralogy, 31, 549–555.

Abstract:
Strontioperloffite, SrMn22+Fe23+PO43OH3⁠, is a new bjarebyite-group mineral from the Spring Creek copper mine, near Wilmington, South Australia, Australia. It occurs as tabular to bladed crystals up to 0.4 mm in size. Associated minerals are copper, cuprite, mitridatite and rhodochrosite. The colour is dark brownish orange and the streak is pale orange. The lustre is vitreous and crystals are translucent. Cleavage is excellent parallel to {100}. Calculated density is 3.89 g/cm3. The mineral is biaxial (–), with α = 1.805(4), β = 1.820(4), γ = 1.829(4). The calculated 2V is 75.0°. Chemical analysis by electron microprobe gave P2O5 31.90, As2O5 0.10, Fe2O3 23.62, Al2O3 0.17, FeO 1.55, MnO 19.41, CaO 0.38, SrO 8.90, BaO 8.65, H2Ocalc 4.08, total 98.81 wt%. The empirical formula based on 15 oxygen atoms is Sr0.57Ba0.38Na0.01∑0.96Mn1.832+Fe0.142+Ca0.05∑2.02Fe1.983+Al0.02∑2.00P3.00As0.01∑3.01O11.98OH3.02.
⁠The ideal formula is SrMn22+Fe23+PO43OH3. The mineral is monoclinic, P21/m, with a = 9.1830(18), b = 12.349(3), c = 5.0081(10) Å, β = 100.23(3)°, V = 558.91(19) Å3 and Z = 2. The strongest eight X-ray powder-diffraction lines [d in Å(I)(hkl)] are: 9.055(32)(100), 5.122(23)(120), 3.158(100)(031, 221¯ 1¯⁠), 3.106(53)(040), 2.985(20)(211), 2.938(22)(140, 310), 2.892(20)(131) and 1.921(53)(222, 350). Strontioperloffite is isostructural with members of the bjarebyite group. The crystal structure was solved from single-crystal X-ray diffraction data using synchrotron radiation and refined to R1 = 4.10% on the basis of 1620 unique reflections with Fo > 4σ(Fo).
Marco E. Ciriotti

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