IMA # (see text) = camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite

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Marco E. Ciriotti
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IMA # (see text) = camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite

Messaggio da Marco E. Ciriotti » mer 08 mag, 2019 17:07

Prossima pubblicazione.

IMA 2018-025 / 2017-106 / 2018-089 / 2017-103 / 2018-022 / 2018-023 = camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite, ríosecoite

Referenza:
▪ Kampf, A.R., Nash, B.P., Celestian, A.J., Dini, M., Molina Donoso, A.A. (2019): Camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite: six new hydrogen-arsenate minerals from the Torrecillas mine, Iquique Province, Chile. Mineralogical Magazine, 83, (in press).

Abstract:
The new minerals camanchacaite, NaCaMg2[AsO4]2[AsO2(OH)2], chinchorroite, Na2Mg5(As2O7)2(AsO3OH)2(H2O)10, espadaite, Na4Ca3Mg2[AsO3OH]3[AsO2(OH)2]9·7H2O, magnesiofluckite, CaMg(AsO3OH)2(H2O)2, picaite, NaCa[AsO3OH][AsO2(OH)2], and ríosecoite, Ca2Mg(AsO3OH)3(H2O)2, were discovered on two closely related specimens collected from the Torrecillas mine, Iquique Province, Chile. These minerals occur as secondary phases on massive quartz-hematite also in association with anhydrite, gypsum, halite and talmessite. Camanchacaite is monoclinic, C2/c, a = 12.470(9), b = 12.554(9), c = 6.848(9) Å, β = 113.75(2)°, V = 981.3(16) Å3 and Z = 4. It has a protonated alluaudite-type structure. Chinchorroite is triclinic, P-1, a = 8.7777(2), b = 8.8570(3), c = 9.7981(7) Å, α = 91.097(6), β = 110.544(8), γ = 103.167(7)°, V = 690.43(7) Å3 and Z = 1. The structure contains abbreviated chains of five edge-sharing Mg octahedra that are linked by pyroarsenate and hydrogen-arsenate groups. Espadaite is orthorhombic, Ccca, a = 12.3649(10), b = 22.181(2), c = 18.3292(13) Å, V = 5027.1(7) Å3 and Z = 4. The structure is based on heteropolyhedral sheets of formula {Ca3Mg2[AsO3(OH)]2[AsO2(OH)2]10}4- that contain large voids; NaO6 polyhedra occupy the interlayer region. Magnesiofluckite is triclinic, P-1, a = 8.4143(6), b = 7.5321(5), c = 6.8917(4) Å, α = 82.477(6), β = 97.682(6), γ = 95.379(6)°, V = 427.84(5) Å3 and Z = 2. It is isostructural with fluckite. Picaite is monoclinic, P21/c, a = 7.2474(4), b = 14.6547(7), c = 7.2624(5) Å, β = 99.520(7)°, V = 760.70(8) Å3 and Z = 4. The structure contains chains of edge-sharing Na- and Ca octahedra with bridging AsO3(OH) and AsO2(OH)2 tetrahedra. Ríosecoite is triclinic, P-1, a = 6.8110(9), b = 7.3156(12), c = 11.7773(17) Å, α = 83.466(6), β = 84.394(6), γ = 79.779(6)°, V = 571.95(15) Å3 and Z = 2. The structure contains tetramers of edge-sharing CaO7 and CaO8 polyhedra linked by MgO6 octahedra and bridging AsO3(OH) groups to form chains.
Marco E. Ciriotti

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Marco E. Ciriotti
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Re: IMA # (see text) = camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite

Messaggio da Marco E. Ciriotti » ven 10 mag, 2019 14:37

In questa piccola miniera cilena, da tempo dismessa, di Torrecillas, Iquique Province, Chile sono state, al momento, identificate 16 nuove specie minerali:

Arseniti:
Cuatrocapaite-(K) K3(NaMg☐)(As3+2O3)6Cl6·16H2O
Cuatrocapaite-(NH4) (NH4)3(NaMg☐)(As3+2O3)6Cl6·16H2O
Gajardoite KCa0.5As3+4O6Cl2·5H2O
Torrecillasite NaAs3+4O6Cl

Arseniati:
Camanchacaite ☐NaCa(MgMg)[AsO4][AsO3(OH)]2
Canutite ☐NaMn(MnMn)[AsO4][AsO3(OH)]2
Chinchorroite Na2Mg5(As2O7)2(AsO3OH)2(H2O)10 (pyroarsenate + protonated arsenate)
Chongite CaMg2Ca2(AsO4)2(AsO3OH)2·4H2O
Currierite Na4Ca3MgAl4(AsO3OH)12·9H2O
Espadaite Na4Ca3Mg2[AsO3(OH)]2[AsO2(OH)2]10·7H2O
Juansilvaite Na5Al3[AsO3(OH)]4[AsO2(OH)2]2(SO4)2·4H2O
Magnesiocanutite Na☐Mn(MgMg)(AsO4)(AsO3OH)2
Magnesiofluckite CaMg(AsO3OH)2(H2O)2
Magnesiokoritnigite Mg(AsO3OH)·H2O
Picaite NaCa[AsO3OH][AsO2(OH)2]
Ríosecoite Ca2Mg(AsO3OH)3(H2O)2

Una Valletta cilena… Questi minerali secondari si formano per l'influenza sulle discariche minerarie dell'evento nebbioso tipico del Deserto di Atacama, chiamato camanchaca.
""Camanchacas are marine stratocumulus cloud banks that form on the Chilean coast, by the Earth's driest desert, the Atacama Desert, and move inland. (In Peru, camanchaca is called garúa) On the side of the mountains where these cloud banks form, the camanchaca is a dense fog that does not produce rain. The moisture that makes up the cloud measure between 1 and 40 microns across, too fine to form rain droplets"".

I seguenti altri minerali secondari di arsenico sono anch'essi presenti:

Arsenites
Arsenolite As2O3
Claudetite As2O3
Lucabindiite KAs4O6Cl

Arsenates
Chudobaite Mg5(AsO4)2(HAsO4)2·10H2O
Hörnesite Mg3(AsO4)2·8H2O
Lavendulan NaCaCu5(AsO4)4Cl·5H2O
Mahnertite NaCu3(AsO4)2Cl·5H2O
Mansfieldite AlAsO4·2H2O
Natropharmacoalumite NaAl4(AsO4)3(OH)4·4H2O
Natropharmacosiderite NaFe3+4(AsO4)3(OH)4·6-7H2O
Scorodite Fe3+AsO4·2H2O
Talmessite Ca2Mg(AsO4)2·2H2O
Wendwilsonite Ca2Mg(AsO4)2·2H2O
Marco E. Ciriotti

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Re: IMA # (see text) = camanchacaite, chinchorroite, espadaite, magnesiofluckite, picaite and ríosecoite

Messaggio da TOSATO FABIO » ven 10 mag, 2019 16:28

Un posto interessante da perderci la mazzetta e la testa con le analisi.
Tosato Fabio
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