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The Morphology of Hydrothermally Synthesized Stilbite Type Zeolites

✍ Scribed by H. Ghobarkar; O. Schäf; U. Guth

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
255 KB
Volume
142
Category
Article
ISSN
0022-4596

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✦ Synopsis

Stilbite, stellerite, and barrerite-zeolites having the stilbite framework-were synthesized in a temperature range between 200 and 250°°C by hydrothermal conversion of artificial waterfree precursor glasses of the respective same composition at 1 kbar H 2 O pressure. No template materials and no sol-gel-like preparation technique was applied. Stilbite was formed from glass of the composition 1Na 2 O-8CaO-9Al 2 O 3 -54SiO 2 with monoclinic symmetry (C2/m, a

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## Abstract Plagioclase crystals Ab~20~An~00~ and nearly pure anorthite were grown on the surface of artificial melts by hydrothermal treatment at 2 kb. The average crystal size was 0.002 to 0.008 mm. In the temperature range of 400° to 600°C a pseudohexagonal habit was observed for anorthite while