IMA 2015-125 = cardite

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Marco E. Ciriotti
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IMA 2015-125 = cardite

Messaggio da Marco E. Ciriotti » gio 22 apr, 2021 11:06

Referenza:
▪ Elliott, P. (2021): Cardite, Zn5.5(AsO4)2(AsO3OH)(OH)3·3H2O, a new zinc arsenate mineral from Broken Hill, New South Wales, Australia. Mineralogy and Petrology, 115, (in press).

Abstract:
Cardite, Zn5.5(AsO4)2(AsO3OH)(OH)3·3H2O, is a new secondary mineral from the Block 14 Opencut, Broken Hill, New South Wales, Australia. Cardite occurs as radiating sprays of acicular crystals to 0.09 mm in length associated with anglesite, pyromorphite and köttigite. The mineral is white to pinkish white and pale tan with a white streak. Crystals are translucent with a vitreous lustre. The tenacity is brittle and the fracture is uneven. The calculated density is 4.02 g/cm3. Electron microprobe analyses (WDS mode) gave ZnO 43.39, CdO 7.26, CoO 1.24, MnO 0.59, FeO 0.12, As2O5 38.84, SO3 0.20, H2O (calc) 9.97, total 101.61 wt%. The empirical formula calculated on the basis of 18 oxygen atoms is (Zn4.75,Cd0.50,Co0.15,Mn0.07,Fe0.01)5.48[(AsO4)2.01(SO4)0.02]2.03(AsO3OH)(OH)2.89·2.98H2O. Cardite is orthorhombic, Cmcm, with unit-cell dimensions (100 K): a = 15.110(3), b = 15.492(3), c = 6.3850(13) Å, V = 1494.7(5) Å3 and Z = 4. The eight strongest lines in the X-ray powder diffraction pattern are [d(Å), (I), (hkl)]: 10.783 (100) (110), 7.564 (85) (200), 4.143 (48) (221), 3.328 (31) (041), 3.012 (20) (421), 2.763 (31) (222), 2.668 (24) (312), 2.451 (21) 260, 351, 461). The crystal structure of cardite (R1 = 0.067 for 13938 observed reflections with Fo > 4σ(Fo)) contains sheets of edge-sharing octahedra in which there is one vacancy for each four Zn cations in the sheet. Two orthogonal sheets lie parallel to (110) and to (1–10) and link along [001] by sharing common octahedra. AsO4 tetrahedra link to both sides of the sheet by corner-sharing. ZnO4 tetrahedra occupy channels in the structure and link to the sheets via corner-sharing AsO4 tetrahedra.
Marco E. Ciriotti

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

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Luciano Vaccari
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Re: IMA 2015-125 = cardite

Messaggio da Luciano Vaccari » mar 27 apr, 2021 9:07

Si sa da dove deriva il nome?
Ben oltre le idee di giusto e di sbagliato c'è un campo. Ti aspetterò laggiù.
(Jalaluddin Rumi- XIII sec.)

Luciano
Socio AMI zona Modena
(Formigine)

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Marco E. Ciriotti
Messaggi: 28417
Iscritto il: ven 25 giu, 2004 11:31
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Re: IMA 2015-125 = cardite

Messaggio da Marco E. Ciriotti » mar 27 apr, 2021 10:24

Sì, certo si sa. E' obbligatorio indicarlo sempre.

Prof. George William Card, petrologo e mineralogista australiano che studiò il deposito, curatore del Mining Museum, Sydney, dal 1893 al 1927.
Marco E. Ciriotti

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

Avatar utente
Luciano Vaccari
Messaggi: 10939
Iscritto il: mer 30 giu, 2004 8:23
Località: Via Pietro Giusti 23 41043 Formigine -MO-

Re: IMA 2015-125 = cardite

Messaggio da Luciano Vaccari » mar 27 apr, 2021 12:43

Grazie.
Ben oltre le idee di giusto e di sbagliato c'è un campo. Ti aspetterò laggiù.
(Jalaluddin Rumi- XIII sec.)

Luciano
Socio AMI zona Modena
(Formigine)

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Marco E. Ciriotti
Messaggi: 28417
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Re: IMA 2015-125 = cardite

Messaggio da Marco E. Ciriotti » mer 14 lug, 2021 13:35

Pubblicazione effettuata.

Referenza:
▪ Elliott, P. (2021): Cardite, Zn5.5(AsO4)2(AsO3OH)(OH)3·3H2O, a new zinc arsenate mineral from Broken Hill, New South Wales, Australia. Mineralogy and Petrology, 115, 467–475.

Abstract:
Cardite, Zn5.5(AsO4)2(AsO3OH)(OH)3·3H2O, is a new secondary mineral from the Block 14 Opencut, Broken Hill, New South Wales, Australia. Cardite occurs as radiating sprays of acicular crystals to 0.09 mm in length associated with anglesite, pyromorphite and köttigite. The mineral is white to pinkish white and pale tan with a white streak. Crystals are translucent with a vitreous lustre. The tenacity is brittle and the fracture is uneven. The calculated density is 4.02 g/cm3. Electron microprobe analyses (WDS mode) gave ZnO 43.39, CdO 7.26, CoO 1.24, MnO 0.59, FeO 0.12, As2O5 38.84, SO3 0.20, H2O (calc) 9.97, total 101.61 wt%. The empirical formula calculated on the basis of 18 oxygen atoms is (Zn4.75,Cd0.50,Co0.15,Mn0.07,Fe0.01)5.48[(AsO4)2.01(SO4)0.02]2.03(AsO3OH)(OH)2.89·2.98H2O. Cardite is orthorhombic, Cmcm, with unit-cell dimensions (100 K): a = 15.110(3), b = 15.492(3), c = 6.3850(13) Å, V = 1494.7(5) Å3 and Z = 4. The eight strongest lines in the X-ray powder diffraction pattern are [d(Å), (I), (hkl)]: 10.783 (100) (110), 7.564 (85) (200), 4.143 (48) (221), 3.328 (31) (041), 3.012 (20) (421), 2.763 (31) (222), 2.668 (24) (312), 2.451 (21) 260, 351, 461). The crystal structure of cardite (R1 = 0.067 for 13938 observed reflections with Fo > 4σ(Fo)) contains sheets of edge-sharing octahedra in which there is one vacancy for each four Zn cations in the sheet. Two orthogonal sheets lie parallel to (110) and to (1–10) and link along [001] by sharing common octahedra. AsO4 tetrahedra link to both sides of the sheet by corner-sharing. ZnO4 tetrahedra occupy channels in the structure and link to the sheets via corner-sharing AsO4 tetrahedra.
Marco E. Ciriotti

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