We found one dictionary that defines the word feldsparphyre:

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1. feldsparphyre: Wiktionary

Definitions from Wiktionary (feldsparphyre) ▸ noun:  A feldspathic porphyry. ▸ Words similar to feldsparphyre ▸ Usage examples for feldsparphyre ▸ Idioms related to feldsparphyre ▸ Wikipedia articles (New!) ▸ Popular adjectives describing feldsparphyre ▸ Words that often appear near feldsparphyre ▸ Rhymes of feldsparphyre ▸ Invented words related to feldsparphyre