A low silica AFI zeolite and a high purity gmelinite zeolite that have a SiO.sub.2 /Al.sub.2 O.sub.3 ratio of about 10 or less are provided.

Un bas zéolite de la silice AFI et un zéolite de gmelinite de grande pureté qui ont un rapport de SiO.sub.2 /Al.sub.2 O.sub.3 environ de 10 ou moins sont fournis.
 
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> Optical fiber with large effective area and low dispersion slope for submarine applications

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