-The chemical and the mineralogical composition of a group of pumiceous tufts associated with recent salic volcanic episodes from Tenerife (Canary Islands) have been studied. The investigation focused on the two main types of pyroclastic deposits of the zone: ash-flows and ash-falls. The samples can be classified chemically as trachytic and phonolitic rocks with an intermediate silica content a...

zeolites due to their structures can be used as molecular sieves for purification of materials and solutions. zeolites with phi and sod structure are so common and applicable for this purpose. hydroxy sodalite and phillipsite are the more abundant members of zeolites which display good selectivity for very small molecules and some ions such as sr, pb, zn, cu and rb. there is not any pure natura...

Zeolites due to their structures can be used as molecular sieves for purification of materials and solutions. Zeolites with PHI and SOD structure are so common and applicable for this purpose. Hydroxy sodalite and phillipsite are the more abundant members of zeolites which display good selectivity for very small molecules and some ions such as Sr, Pb, Zn, Cu and Rb. There is not any pure natura...

Zeolite Phi is synthesized by two methods reported previously. Results from X-ray powder diffraction and scanning electron microscopy suggest that t h e materials are physical mixtures of chabazite and offretite; one sample has a small amount of phillipsite. The X-ray powder diffraction data from these samples, and those reported previously, are indexed and their unit-cell parameters compare we...

Ion exchange represents one of the most promising processes for ammonium recovery from municipal wastewater (MWW). However, previous studies on ion did not optimize process or evaluate its robustness under real operational conditions. This experimental study aimed at (i) developing a procedure selection sorbent selective removal/recovery MWW, (ii) validating by applying it to several sorbents, ...

A new locality of böhmite and zeolite minerals, called „Soutěsky above the quarry“, occurs near quarry „Soutěsky“ on SW slope Hlídka hill, eastward Soutěsky village, about 5 km od town Děčín (Czech Republic). The mineralization is bound to vugs Cenozoic volcanics. Böhmite forms mostly whitish brownish hemispherical spherical clusters up mm in size. unit-cell parameters böhmite, refined from X-r...

This work deals with geopolymers based on local Jordanian resources, namely, kaolin and zeoltitic (phillipsite) tuff. The geopolymers were prepared from these two materials by a reaction with an alkali solution at 80oC. The research group of the present work has demonstrated in previous work that addition of zeolitic tuff to kaolin based-geopolymers increases the adsorption capacity toward Cu(I...

Abstract Flörkeite, a rare zeolite with PHI (phillipsite) framework type, was found in numerous amygdaloidal voids pyrometamorphic rocks of the Hatrurim Basin, Complex, Israel. This is second reported occurrence flörkeite previously Ca-rich xenolith from quarry at Bellerberg volcano near Ettringen, East Eifel volcanic area, Germany. The mineral empirical crystal chemical formula (K2.91Ca2.00Na0...