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Aschroftine-(Y) Micro and rare species collections. K5Na5(Y,Ca)12Si28O70(OH)2(CO3)8·8H2O Canada Quebec, Mt. St-Hilaire. “occurs as very fine, divergent sprays, tufts and small masses of randomly oriented capillary to fibrous crystals in a very small number of cavities in the breccia zones and in some miarolitic cavities in nepheline syenite. Individual crystals are very thin (0.01 mm across), 2-20 mm long, flexible, soft and commonly bent. The luster is silky and the color is very pale violet, pale pink and white. Associated minerals are microcline, albite, aegirine, quartz, bastnäsite, lorenzenite, brookite, elpidite, leucosphenite, cordylite and narsarsukite. The fine, acicular lorenzenite occurring in the breccia cavities bears a very close resemblance to aschroftine-(Y) and the two species are sometimes intimately intergrown, making reliable sight identification nearly impossible. Lorenzenite, however, is far more common than aschroftine-(Y) and fluoresces pale yellow under short wave ultraviolet radiation. Aschroftine is not fluorescent.”1 1 Mineralogical Record, Vol. 21, 1990, p296-7.
Aschroftine Greenland Narsarsuk. When Sam Gordon collected at Narsarsuk in 1923 he reported discovering specimens of kalithomsonite which was later found not to be a variety of thomsonite but rather a new mineral and it was given the name aschroftine. “The mineral is vinaceous-pink in color; probably due to the 0.85% MnO present. It occurred as a more or less incoherent mass of acicular crystals, rarely measuring more than 4 mm in length, and 0.25 mm in thickness, although usually much smaller.”1 At Narsarsuk it is associated with calcite, elpidite, albite, graphite etc. 1 Mineralogical Record, Vol. 5, 122, p122.