A mineral or gemstone of undetermined or variable composition, sometimes used in jewelry or lapidary work.
From Greek 'agate' (a type of stone) combined with the mineral suffix '-lite' (stone). This term appears in older mineralogical texts but lacks a precise modern definition.
The vague definition of 'agalite' in mineralogy shows how scientists had to reclassify and rename stones as chemical analysis improved — what was once considered one mineral might actually be several different ones!
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