Crystal chemistry of the sakhaite–harkerite solid solution

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Marco E. Ciriotti
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Crystal chemistry of the sakhaite–harkerite solid solution

Messaggio da Marco E. Ciriotti » mer 01 ago, 2018 12:08

Prossima pubblicazione.

Referenza:
▪ Evans, R.J., Groat, L.A., Cempírek, J., Škoda, R., Grew, E.S., Bernard, C. (2018): The crystal chemistry of the sakhaite–harkerite solid solution. American Mineralogist, 103, (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: 24839
Iscritto il: ven 25 giu, 2004 11:31
Località: via San Pietro, 55 I-10073 Devesi/Cirié TO - Italy
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Re: Crystal chemistry of the sakhaite–harkerite solid solution

Messaggio da Marco E. Ciriotti » gio 01 nov, 2018 10:46

Pubblicazione effettuata.

Referenza:
▪ Evans, R.J., Groat, L.A., Cempírek, J., Škoda, R., Grew, E.S., Bernard, C. (2018): The crystal chemistry of the sakhaite–harkerite solid solution. American Mineralogist, 103, 1749–1760.

Abstract:
Sakhaite, ca. Ca48Mg16(BO3)32(CO3)16(HCl,H2O)2, is a rare rock-forming borate-carbonate mineral typically occurring in high-temperature, low-pressure calcareous skarns. It forms a complete solid solution with harkerite, ca. Ca48Mg16[AlSi4(O,OH)16]4(BO3)16(CO3)16(HCl,H2O)2. The solid solution can be described with the general formula Ca48(Mg,Fe,Mn)16(CO3)16[AlaSi5–a(O,OH)16]y(BO3)32–4y(HCl,H2O)n, where ymax = 8 and nmax = 16 – y. In this study, we examine samples of sakhaite and harkerite from four localities worldwide: Titovskoye deposit, Sakha Republic, Russia (type locality for sakhaite); Solongo B deposit, Buryatia Republic, Russia; Camas Malag, Skye, Scotland (type locality for harkerite); as well as a sakhaite-like mineral from the Kombat Mine, Tsumeb. The Si:B ratios of the samples ranged from that of end-member sakhaite (containing B only) to that of end-member harkerite (Si:B = 1:1), with several intermediate compositions. All samples were deficient in B relative to the ideal composition, implying significant substitution for borate groups. The Si:Al ratio of silicate-containing samples ranged from the ideal 4:1 to 4:1.5, implying substitution of Al at the Si site. The cubic unit-cell parameter was found to increase linearly with increasing Si content, except for the sakhaite-like mineral from Tsumeb. This mineral was found to have significant substitution of Pb for Ca (0.4–0.5 apfu) and was poor in Cl, which in most sakhaite and harkerite samples occupies the interstitial site surrounded by four borate groups. This interstitial site in the Tsumeb samples appears to be, instead, mainly occupied by H2O, which may qualify the mineral as a distinct species.
Marco E. Ciriotti

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