IMA 2016-099 = arsenmedaite
- 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:
IMA 2016-099 = arsenmedaite
Prossima pubblicazione.
Referenza:
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, (in press).
Referenza:
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, (in press).
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- TOSATO FABIO
- Messaggi: 7528
- Iscritto il: ven 13 gen, 2006 11:39
- Località: via A.Cantele n.15 35129 PADOVA
Re: IMA 2016-099 = arsenmedaite
Complimenti a tutti.
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.
- 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 2016-099 = arsenmedaite
Referenza:
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, (in press).
Abstract:
The new mineral species arsenmedaite, ideally Mn2+6As5+Si5O18(OH), has been discovered in quartz veinlets in the braunite ore deposit of the Molinello mine, Graveglia Valley, Ne, Genova, Liguria, Italy. It occurs as orange-reddish prismatic crystals, up to 200 μm in length, with a vitreous lustre, associated with braunite, quartz, calcite, As-rich medaite, calcian rhodocrosite, talc, and ganophyllite. Electron microprobe analysis of arsenmedaite gave (in wt%): V2O5 = 1.84, As2O5 = 6.81, SiO2 = 38.75, CaO = 0.70, MnO = 50.28, H2Ocalc = 1.42, total 99.80. On the basis of ΣMe = 12 atoms per formula unit, the chemical formula of arsenmedaite is (Mn5.89Ca0.10)Σ5.99[(As0.49V0.17)Σ0.66Si5.35]Σ6.01O17.69(OH)1.31. The main diffraction lines are [d in Å (relative intensity) hkl]: 3.266 (100) 081, 3.159 (72) 052, 3.094 (82) 221, 2.963 (83) 091, 2.935 (79) 211, 2.788 (68) 072, and 2.612 (98) 082. The crystal-structure study gives a monoclinic unit cell, space group P21/n, with a = 6.7099(3), b = 29.001(1), c = 7.5668(3) Å, β = 95.469(3)°, V = 1465.7(1) Å3, Z = 4. The crystal structure has been solved and refined to R1 = 0.062 on the basis of 3526 reflections with F0 > 4σ(F0) and 287 parameters. Arsenmedaite is isotypic with medaite. In its crystal structure, six- to seven-fold coordinated Mn-centred polyhedra form wavy ribbons linked to TO4 tetrahedra centred by Si and (As,V). Its formation is likely related to the late-stage circulation of As- and Mn-rich hydrothermal fluids during the final stages of the Alpine tectono-metamorphic evolution of the manganese ore deposits of Eastern Liguria.
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, (in press).
Abstract:
The new mineral species arsenmedaite, ideally Mn2+6As5+Si5O18(OH), has been discovered in quartz veinlets in the braunite ore deposit of the Molinello mine, Graveglia Valley, Ne, Genova, Liguria, Italy. It occurs as orange-reddish prismatic crystals, up to 200 μm in length, with a vitreous lustre, associated with braunite, quartz, calcite, As-rich medaite, calcian rhodocrosite, talc, and ganophyllite. Electron microprobe analysis of arsenmedaite gave (in wt%): V2O5 = 1.84, As2O5 = 6.81, SiO2 = 38.75, CaO = 0.70, MnO = 50.28, H2Ocalc = 1.42, total 99.80. On the basis of ΣMe = 12 atoms per formula unit, the chemical formula of arsenmedaite is (Mn5.89Ca0.10)Σ5.99[(As0.49V0.17)Σ0.66Si5.35]Σ6.01O17.69(OH)1.31. The main diffraction lines are [d in Å (relative intensity) hkl]: 3.266 (100) 081, 3.159 (72) 052, 3.094 (82) 221, 2.963 (83) 091, 2.935 (79) 211, 2.788 (68) 072, and 2.612 (98) 082. The crystal-structure study gives a monoclinic unit cell, space group P21/n, with a = 6.7099(3), b = 29.001(1), c = 7.5668(3) Å, β = 95.469(3)°, V = 1465.7(1) Å3, Z = 4. The crystal structure has been solved and refined to R1 = 0.062 on the basis of 3526 reflections with F0 > 4σ(F0) and 287 parameters. Arsenmedaite is isotypic with medaite. In its crystal structure, six- to seven-fold coordinated Mn-centred polyhedra form wavy ribbons linked to TO4 tetrahedra centred by Si and (As,V). Its formation is likely related to the late-stage circulation of As- and Mn-rich hydrothermal fluids during the final stages of the Alpine tectono-metamorphic evolution of the manganese ore deposits of Eastern Liguria.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- 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 2016-099 = arsenmedaite
Pubblicazione effettuata.
Referenza:
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, 117-126.
Referenza:
▪ Biagioni, C., Belmonte, D., Carbone, C., Cabella, R., Zaccarini, F., Balestra, C. (2019): Arsenmedaite, Mn2+6As5+Si5O18(OH), the arsenic analogue of medaite, from the Molinello mine, Liguria, Italy: occurrence and crystal structure. European Journal of Mineralogy, 31, 117-126.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
- TOSATO FABIO
- Messaggi: 7528
- Iscritto il: ven 13 gen, 2006 11:39
- Località: via A.Cantele n.15 35129 PADOVA
Re: IMA 2016-099 = arsenmedaite
COMPLIMENTI A TUTTI
Tosato Fabio
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.
"Il vero viaggio di scoperta non consiste nel cercare nuove terre, ma nell'avere nuovi occhi." M. Proust
Noi siamo anche quello che non siamo riusciti ad essere.
Sic transit gloria mundi.
Re: IMA 2016-099 = arsenmedaite
Complimenti a tutti e a Manlio Callandria scopritore del minerale.
- 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 2016-099 = arsenmedaite
Copie per uso personali saranno disponibili per eventuali interessati, non appena scaricabili dal sito web della rivista.
Marco E. Ciriotti
«Things are interesting only in so far as they relate themselves to other things»
«Things are interesting only in so far as they relate themselves to other things»
-
- Messaggi: 616
- Iscritto il: mer 31 gen, 2007 16:44
- Località: Cavour - Torino
Re: IMA 2016-099 = arsenmedaite
Prenoto una copia, grazie Marco.
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Le difficoltà della vita piegano alcuni uomini, ma ne rafforzano altri.
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Walter Bonatti
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