Abstract
This New Mineral Names has entries for nine new minerals, including cayalsite-(Y), engelhauptite, flurlite, hydroniumpharmacoalumite, mambertiite, paradsasvarite, perettiite-(Y), shuvalovite, and suseinargiuite. # Cayalsite-(Y)* {#article-title-2} T. Malcherek, J. Schluter, M. Cooper, N. Ball, and T. Husdal (2015) Cayalsite-(Y), a new rare-earth calcium aluminium fluorosilicate with OD character. European Journal of Mineralogy , 27(5), 683–694. The new mineral cayalsite-(Y) (IMA 2011-094), ideally CaY6Al2Si4O18F6 was found in cavities of Y-fluorite in two granitic NYF-pegmatites hosted by 1742 ± 46 Ma granitic gneiss in Tysfjord, Nordland, Norway: Stetind (68°10′15.20″N 16°33′10.65″E) and Ovre Lapplaegeret (68°02′3.26″N 16°00′14.98″E). At both localities, cayalsite-(Y) occurs as a late-stage mineral forming colorless to faintly pink vitreous prismatic crystals up to 1.2 × 0.4 mm or radiating aggregates. Observed crystal forms are: prisms {011}, {012}, {110}, {210}, {201}; dipyramids {221}, {312}; and pinacoids {100}, {010}, {001}. Closely associated minerals at both localities are bastnasite-(Ce), hematite and vyuntspakhkite-(Y). Hundholmenite-(Y) and a montmorillonite-like mineral are found in Stetind. Cayalsite-(Y) has been found in two polytypes (1 M and 1 O ). Both polytypes occur as intergrown crystals in Stetind while only the 1 O -polytype has been clearly identified at Ovre Lapplaegeret. Cayalsite-(Y) has a white streak, vitreous luster, and does not show any fluorescence. It is brittle with uneven fracture and no observed cleavage. The micro-indentation hardness of 1 O polytype (the load weight not given) VHN = 1049 kg/mm2 (10 390.7 MPa) corresponds to ~6½ of Mohs scale. The density was not measured. …
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