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Keywords from Image Description:
Helvine. Helvine Helvite Locality Poudrette quarry Demix quarry UniMix quarry Desourdy quarry Carrire Mont SaintHilaire Mont SaintHilaire Rouville RCM Montrgie Qubec Canada FOV mm MOB coll MSH helvite can be reliably distinguished from genthelvite via its UV response deep red vs green Horvath et al Min Rec etc According to Mandarino