The present invention relates to selectively isolating gases using a natrolite-based zeolite, and more particularly, to a novel natrolite-based zeolite and to selectively isolating hydrogen andor helium gas using a natrolite-based zeolite. The subject invention also concerns methods for synthesizing the compounds of the invention. a victim, and the monitoring party so remote location of the called party and the monitoring personnel. The vehicle unit includes a user interface component that presents the received navigation information and records user requests.