This is a classic pseudomorph from a well-known locality that has produced the best examples of Luzonite. The enargite here is being replaced by luzonite, is probably mostly replaced - but I do not think the replacement is 100% yet because of the general look of it. I could be wrong, and I cannot pin why I feel this way, but it just seems off in color or luster, to me, compared to the full luzonite pseudomorphs I have seen in the past. Perhaps it is caught in transition, partly each species. Rarely do you see these specimens on matrix and here we have it on both pyrite and host rock matrix. A fine old classic from a now defunct locale. Ex. Charlie Key.