Containing or composed of feldspar; having the characteristics or composition of feldspar.
From 'feldspar' plus the adjective suffix '-ic.' Used in geology and mineralogy to describe rocks and minerals that are rich in or dominated by feldspar.
Feldspathic rocks are so common that geologists often use this term as shorthand—saying 'that's feldspathic' tells other geologists immediately that quartz probably isn't the star mineral of the rock!
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