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Astrophyllite. Astrophyllite Size cm Locality Poudrette quarry Demix quarry UniMix quarry Desourdy quarry Carrire Mont SaintHilaire Mont SaintHilaire Rouville RCM Montrgie Qubec Canada The xl is about cm and about mm thick MOB coll By the MSH astrophyllite rules of thumb given by Paula Piilonen CMMA Newsletter Mar would expect