different between feldspathoidal vs feldspathoid

English

From feldspathoid +? -al.

feldspathoidal (not comparable)

From German Feldspath (“feldspar”) +? -oid.

feldspathoid (countable and uncountable, plural feldspathoids)

(mineralogy) Any of a small group of igneous, plutonic, and volcanic minerals formed in magma that did not contain enough silica to satisfy all the chemical bonds. Feldspathoids are silica-poor variants of the feldspar group.

analcime, cancrinite, hauynite, kalsilite, lazurite, leucite, nepheline, nosean, sodalite

feldspathoid (not comparable)

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