Données nouvelles sur la laumontite de la zone métamorphique de Libramont, Belgique [New mineralogical data on laumontite from the metamorphic zone of Libramont, Belgium]
Keyword(s):
New laumontite occurrences have been discovered at Bertrix, Ochamp and Luchy, in the metamorphic zone of Bastogne-Libramont. Wet chemical analyses lead to compositions close to Ca[Al2Si4O12].4H2O, with a slightly variable water content and a significant amount of potassium (up to 0.76% K2O). Infrared spectra show an ordered distribution of tetrahedral Si and Al, and relatively low hydrogen bonds between zeolitic water and crystal freamework. Laumontite crystallized in rocks fractures, under a presure lower than 3 kbar and a temperature between 170 and 280°C. The presence of albite in quartz veins and of laumontite in rocks fissures indicates a different geochemical behaviour for Na and Ca during this retrometamorphic phase.
1971 ◽
Vol 38
(295)
◽
pp. 328-334
◽
Keyword(s):
2011 ◽
Vol 199-200
◽
pp. 1906-1911
Keyword(s):
1976 ◽
Vol 32
(5)
◽
pp. 923-930
◽
Keyword(s):