feldspathoid(redirected from feldspathoidal)
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Any of a group of relatively rare minerals that are chemically very similar to feldspars, but have too little silica to qualify as feldspars.
(Geological Science) any of a group of rock-forming minerals, such as leucite and sodalite, that are similar to feldspars but contain less silica
feld•spath•oid(ˈfɛld spæˌθɔɪd, ˈfɛl-)
1. Also, feld`spath•oi′dal. of or pertaining to a group of minerals similar in chemical composition to certain feldspars except for a lower silica content.n.
2. a mineral of this group, as nepheline or leucite.