1991
DOI: 10.1180/minmag.1991.055.379.08
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Apophyllite and other zeolite-type minerals from the Whin Sill of the northern Pennines

Abstract: Apophyllite, analcite, chabazite, prehnite and stilbite are described from pectolite-, chlorite-, calcite- and quartz-bearing veins and joint coatings in the late Carboniferous quartz dolerite of the Whin Sill of the northern Pennines. These veins represent the final hydrothermal stages in the sill's emplacement and are not related to the widespread lead-zinc-barium-fluorite mineralization of the northern Pennine orefield. Thermogravimetric studies of apophyllites from the two Whin Sill occurrences reveal that… Show more

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Cited by 4 publications
(3 citation statements)
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“…La formación de fluorapofilita dentro de estas asociaciones parece muy vinculada a la hidrólisis del feldespato potásico (Young et al, 1991) Yposterior a la laumontita y, probablemente también de la estilbita.…”
Section: Discussionunclassified
“…La formación de fluorapofilita dentro de estas asociaciones parece muy vinculada a la hidrólisis del feldespato potásico (Young et al, 1991) Yposterior a la laumontita y, probablemente también de la estilbita.…”
Section: Discussionunclassified
“…Investigations of the thermal behavior of fluorapophyllite-(K) and of related end-members of the group were carried out by quite a large number of authors (e.g., [11,38,43,45,47,54,[61][62][63]). The DTA and TG curves recorded for fluorapophyllite-(K) from Aleului Valley using the analytical conditions given in Chapter 3 are given in Figure 7.…”
Section: Thermal Behaviormentioning
confidence: 99%
“…Two weak endothermic effects recorded at lower temperatures (81 °C and 121 °C) are due to the loss of adsorbed and fluid-inclusion water, respectively, from the (ground) sample. The first three endothermic effects, observed in fluorapophyllite by the majority of authors, e.g., [11,38,43,45,47,62,63], are due to dehydration and may be [11,38,43,45,47,62,63], are due to dehydration and may be interpreted as follows:…”
Section: Thermal Behaviormentioning
confidence: 99%