Crystal Structure of Near-Endmember Arrojadite-(BaNa) from Big Fish River, Yukon, Canada

Tomes, Heidi E.; Cecco, Veronica E. Di; Tait, K. T.; Cámara, Fernando

doi:10.3749/canmin.1800018

Cited by 1 publication

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“…Arrojadite-group minerals occur also associated with quartz related to hydrothermal activity accompanying a high-phosphorus, extremely fractionated topaz-"zinnwaldite" leucogranite in the Gemerská Poloma area (Košice Region, Slovak Republic; Števko et al, 2015, 2018). Arrojadite-group minerals are also reported in sedimentary rocks, as in northwestern Yukon Territory, Canada (Robertson, 1982;Young & Robertson, 1984;Robinson et al, 1992;Tomes et al, 2018), although this is a unique locality. The space group of dickinsonite was given by Wolfe (1941) as C2/c.…”

Section: Introductionmentioning

confidence: 93%

Fluorcarmoite-(BaNa), the first Mg-dominant mineral of the arrojadite group

Cámara¹,

Bittarello²,

Ciriotti³

et al. 2019

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was found in a pebble of the riverbed of the upper Maremola Creek, close to the village of Isallo, in the Magliolo municipality (Savona, Liguria, Italy). The root-name is after Monte Carmo di Loano, the highest peak in the area, namesake of the tectonic unit where the mineral was found and the first locality where phosphate mineralization has been found in the region. The mineral is associated with quartz and almandine and has microscopic inclusions of fluorapatite and possible graftonite. It occurs as yellow-orange and translucent crystals in an anhedral centimetric nodule embedded in quartz. Fluorcarmoite-(BaNa) is brittle, and no cleavage or parting was observed. It has a yellow-orange streak, a vitreous lustre, does not fluoresce under shortwave or longwave ultraviolet light and is weakly pleochroic (light yellow). Fluorcarmoite-(BaNa) is optically biaxial positive, with a = 1.6240(5), b = 1.6255(5), c = 1.6384(5) (589 nm), 2V meas = 35(2)°and 2V calc = 37.9°. Raman spectroscopy shows the presence of weak bands in the OH-stretching region. The average chemical composition is (wt%, wavelength-dispersive-mode electron microprobe):

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Section: Introductionmentioning

confidence: 93%