IMA 2021-082a = medvedevite

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Marco E. Ciriotti
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IMA 2021-082a = medvedevite

Messaggio da Marco E. Ciriotti » ven 13 mag, 2022 11:19

Prossima pubblicazione.

Referenza:
▪ Shablinskii, A.P., Avdontceva, M.S., Vergasova, L.P., Filatov, S.K., Avdontseva, E.Yu., Povolotskiy, A.V., Moskaleva, S.V., Kargopoltsev, A.A., Britvin, S.N., Shorets, O.U. (2022): Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012-2013, Kamchatka Peninsula, Russia. Mineralogical Magazine, 86, (in press).

Abstract:
Medvedevite, KMn2+V5+2O6Cl∙2H2O, is a new mineral discovered in the Toludskoe lava field, formed during the 2012-2013 Tolbachik fissure eruption. The mineral occurs as thin acicular transparent bright red crystals up to 0.15 mm. Medvedevite is associated with thénardite, halite, aphthitalite, leonite, kieserite, eugsterite and syngenite. The empirical formula calculated on the basis of 13+ positive charge units for the anhydrous part and 2H2O is (K1.02Na0.03)Σ1.05Mn2+0.95(V5+1.92S6+0.05Si0.04)Σ2.01O6.02Cl0.96∙2H2O. The crystal structure of medvedevite was determined using single-crystal X-ray diffraction data; monoclinic crystal system, the space group is P21/c, a = 7.1863(2), b = 10.1147(3), c = 12.7252(4) Å, β = 106.243(3)°, V = 888.04(5) Å3, Z = 4 and R1 = 0.029. The concept of “structural unit” and “interstitial complex” could be applied to the crystal structure of medvedevite. The structural units in medvedevite are based on the high bond-valence V5+O5 polyhedra which share edges and link into [V2O6] chains elongated along the a axis. The interstitial complexes consist of Mn2+, K+ cations and H2O groups and occupy the interstices between structural units. The mineral is optically biaxial (+), with α =1.782(2), β = 1.786(2), γ = 1.792(2), 2V(calc) = 41° (λ = 589 nm). The seven strongest lines of powder XRD pattern are [d, Å (I, %) (hkl)]: 7.79(100)(011); 5.70(11)(110); 4.75(14)(11-2); 3.89(29)(022); 3.25(53)(031); 2.958(79)(21-3); 2.850(33)(220). The mineral has been named in honor of the Russian geologist and chemist Robert Alexandrovich Medvedev (1939–2005).
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
Contatta:

Re: IMA 2021-082a = medvedevite

Messaggio da Marco E. Ciriotti » mer 26 ott, 2022 13:35

Pubblicazione effettuata.

Referenza:
▪ Shablinskii, A.P., Avdontceva, M.S., Vergasova, L.P., Filatov, S.K., Avdontseva, E.Yu., Povolotskiy, A.V., Moskaleva, S.V., Kargopoltsev, A.A., Britvin, S.N., Shorets, O.U. (2022): Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012-2013, Kamchatka Peninsula, Russia. Mineralogical Magazine, 86, 478-485.
Marco E. Ciriotti

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

Avatar utente
Marco E. Ciriotti
Messaggi: 31675
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
Contatta:

Re: IMA 2021-082a = medvedevite

Messaggio da Marco E. Ciriotti » mer 26 ott, 2022 13:35

Pubblicazione effettuata.

Referenza:
▪ Shablinskii, A.P., Avdontceva, M.S., Vergasova, L.P., Filatov, S.K., Avdontseva, E.Yu., Povolotskiy, A.V., Moskaleva, S.V., Kargopoltsev, A.A., Britvin, S.N., Shorets, O.U. (2022): Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012-2013, Kamchatka Peninsula, Russia. Mineralogical Magazine, 86, 478-485.
Marco E. Ciriotti

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

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