generic name for a large and varied group of minerals, consisting of hydrous silicates in which the bases are alumina and the alkalies and alkaline earths; generally characterized by swelling up and fusing to a glass or enamel before the blowpipe, and often by gelatinizing with acids; commonly found in the cavities of igneous rocks. Examples are analcite, brewsterite, chabazite, harmotome, natrolite, phillipsite, stilbite, thomsonite, etc., tseoliidid - vett sisaldavate alumosilikaatide hulka kuuluv mineraalide rühm, milles katioonideks on pms. kaltsium ja naatrium, harvemini kaalium, baarium ja strontsium ning mõnikord magneesium ja mangaan