An older or archaic term meaning containing abundant feldspar or having felspathic characteristics.
From 'felspar' combined with the suffix '-ose' (meaning 'full of' or 'characterized by'), using a more archaic pattern than modern '-ic' suffix. This term reflects 18th-century mineralogical terminology.
Felspathose is basically the fancy Victorian-era way of saying 'really loaded with feldspar'—like how people once said 'copious' instead of 'lots,' geological language got fancier too.
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