A rare mineral or geological formation, possibly a variant of or related to a known mineral species.
From allo- (other) + delph- (possibly relating to delphinite or similar minerals) + -ite (mineral suffix). This appears to be a highly specialized mineralogical term.
Allodelphite is so rare and obscure that it might only be known to a handful of mineralogists worldwide—these forgotten minerals remind us how much Earth still has to teach us!
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