Feldspathoidal

/ˌfɛldspæθɔɪˈdəl/ adjective

Definition

Resembling or relating to feldspathoids; having characteristics similar to feldspathoid minerals.

Etymology

From 'feldspathoid' plus the adjective suffix '-al.' Used in geology to describe rocks or minerals that have feldspathoid-like properties or compositions.

Kelly Says

The term 'feldspathoidal' lets geologists describe whole rock families without listing every mineral—saying a rock is 'feldspathoidal' immediately tells other scientists it's silica-poor and rich in light-colored minerals!

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