10/17/2023 0 Comments Westland survival where to find basaltThe crystal structure topology and maximum possible symmetry of the idealised structure are what really matters. Hence, the differences are far too slight to merit multiple species names, and analcime is a common example of a number of minerals which occur in multiple crystal system/space group varieties. Macroscopically, the crystals always look pseudocubic, apart from the very slight nonzero birefringence and fine lamellar twinning visible in the polarising microscope, because the ordering and crumpling happens in different directions in different lamellae, and over the whole crystal it averages out. The reduction to various lower symmetries occurs because of slight changes in the ordering of Si and Al atoms and slight crumpling of the framework. The mineral occurs in multiple crystal systems but the aluminosilicate framework of the crystal structure does not change in topology at all. Possible unnamed K analogue is known ( 'UM1967-09-SiO:AlHKNa'). Analcime-Pollucite Series and the Analcime-Wairakite Series.
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