An archaic variant spelling of feldspar or felspar used in older mineralogical texts.
A rare alternative spelling combining 'fels-' with the archaic suffix '-path' (from Greek 'pathos,' meaning nature or essence). This variant appears in 18th and 19th-century geological literature but is largely obsolete.
Felspath is basically the forgotten cousin of feldspar—you'll only find it in really old geology books, and it shows how scientists kept trying different spellings before they settled on the standard 'feldspar' we use today.
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