The presence of satellite reflections seems to be a universal property of nepheline (Vulić et al., 2011) most samples show a practically complete Si-Al-ordering, but some exhibit disorder up to 20%.Įbay Warning: Some dealers on Ebay are selling aragonite specimens as 'nepheline'. ![]() Likely polymorphous with so-called carnegieite and 'α-carnegieite'.Ĭompare the related kalsilite and 'UM1967-10-SiO:AlHNa', the latter being possibly a natural analogue of "nepheline hydrate". Common in nepheline syenite, an igneous rock often found in alkaline complexes. 42, April 2018.Ī rock-forming mineral, and classed as a feldspathoid. ![]() ![]() A very important change concerning nepheline is found in the recent (42th) IMA Newsletter: potassium is essential in nepheline and the formula is changed to that recognized by Mindat See for details, and CNMNC Newsletter No.
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