Crystal Chemistry of Cancrinite-Group Minerals With an Ab-Type Framework: A Review and New Data. Ii. Ir Spectroscopy and Its Crystal-Chemical Implications

Abstract

We present a comparative analysis of powder infrared spectra of cancrinite-group minerals with the simplest framework, of AB type, from the viewpoint of crystal-chemical characteristics of extra-framework components. We provide IR spectra for typical samples of cancrinite, cancrisilite, kyanoxalite, hydroxycancrinite, depmeierite, vishnevite, pitiglianoite, balliranoite, davyne and quadridavyne, as well as the most unusual varieties of cancrinite-subgroup minerals (Ca-deficient cancrinite, H 2 O-free cancrinite, intermediate members of the series cancrinite -hydroxycancrinite, cancrinite-cancrisilite, cancrinitekyanoxalite, K-rich vishnevite, S 2 -bearing balliranoite). Samples with solved crystal structures are used as reference patterns. Empirical trends and relationships between some parameters of IR spectra, compositional characteristics and unit-cell dimensions are obtained. The effect of Ca content on stretching vibrations of CO 3 2is explained in the context of the cluster approach. The existence of a hydrous variety of quadridavyne is demonstrated.

Control of Carbon Dioxide Sequestration by Mechanical Activation of Red Mud

“…By milling, this absorption region and the 1640 cm −1 is decreasing in intensity, supporting the presence of water which was not removed by 105 °C drying and is mostly contained in goethite [75]. However, H 2 O in cancrinite is also producing bands in the 1630-1650 cm −1 region [76].…”

“…This is due to chemisorbed CO 2 and carbonate formation in fresh red mud, and since calcite amount is relatively stable according to the XRD, the variation of band position and intensity of this region is also related to cancrinite carbonation. Chukanov et al [76] reported overlapping bands at 1396, 1444 and 1489 cm −1 for a hydroxycancrinite-cancrinite transitional mineral phase. Values of 1381, 1397, 1434, 1480 and 1512 cm −1 are reported by Ventura et al [85].…”

Davidbrownite-(NH4), (NH4,K)5(V4+O)2(C2O4)[PO2.75(OH)1.25]4·3H2O, a new phosphate–oxalate mineral from the Rowley mine, Arizona, USA

“…Weak Raman bands and a stronger infrared band in the 1700–1600 cm –1 region, as seen in the davidbrownite-(NH 4 ) spectra, are consistent with the spectroscopic features of oxalate groups in potassium manganese oxalotophosphite (Orive et al ., 2018), ammonium vanadyl oxalatophosphite (Kouvatas et al ., 2017) and various minerals with essential (Frost and Weier, 2003) and non-essential (Chukanov et al , 2011) oxalate. The strong Raman band at 1499 cm –1 corresponds to the strong C–O stretch seen in other oxalates such as the 1496 cm –1 band in potassium–oxalate solution (Edwards et al , 1991), which also has a less-intense 1459 cm –1 band comparable to the 1453 cm –1 band in the davidbrownite-(NH 4 ) spectra.…”

Cancrinite–vishnevite solid solution from Cinder Lake (Manitoba, Canada): crystal chemistry and implications for alkaline igneous rocks

“…Cancrinite-group minerals commonly occur in silica-undersaturated rocks (syenites and ijolite-urtite series) either as a primary phase precipitated from evolved volatile-rich magmas, or as a product of reaction between primary nepheline and volatile-rich melts or fluids (Deer et al, 1992). Cancrinite and vishnevite have been recognized at numerous localities around the world (Pekov et al, 2011), but the best-studied examples are those from Laacher See, Eifel, Germany (Chukanov et al, 2011;Pekov et al, 2011); Loch Borralan, Scotland and Latium, Italy (Della Ventura et al, 2007); Ilmeny and Vishnevye Mountains, Urals, Russia (Hassan and Grundy, 1984;Della Ventura et al, 2007;Chukanov et al, 2011;Pekov et al, 2011); Dakhunur and Bayankol, Tuva, Russia (Reshetnyak et al, 1988); Kovdor, Khibiny and Lovozero, Kola Peninsula, Russia (Rastsvetaeva et al, 2007;Olysych et al, 2008); and Tamazert, High Atlas, Morocco (Chukanov et al, 2011;Pekov et al, 2011). In Canada, cancrinite was reported from biotitenepheline gneisses of the Bancroft area (Phoenix and Nuffield, 1949), where one of the collecting sites is colloquially known as the Cancrinite Hill, and sodalite syenites of Mont Saint-Hilaire (Horváth and Gault, 1990), but no detailed studies of any Canadian material have been published.…”

“…The most plausible explanation for this discrepancy is that OHor another undetected channel species is present in this phase, resulting in the overestimated carbonate content. An intermediate member of the cancrinitehydroxycancrinite series has been reported by Chukanov et al (2011), but conclusive identification of such phases is impossible in the absence of infrared data.…”