Rich in or containing abundant feldspar; characterized by the presence of significant amounts of feldspar minerals.
From 'feldspar' plus the suffix '-ose,' meaning 'full of' or 'characterized by.' An older geological term similar in meaning to 'feldspathic.'
Older geology texts use 'feldspathose' instead of 'feldspathic'—this shows how scientific terminology evolves, and modern geologists prefer the '-ic' ending, making '-ose' mostly historical now!
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