Tyrolite is normally just crust on a rock, or small acicular crystals, from most locales that I have seen. This piece, however, features huge, intensely green crystals on matrix, and is probably from the early 1900s. It is attractive and incredibly rich for the species. ex Conklin collection, and formerly in the American Museum of Natural History. NOTE this piece is stabilised on the backside, with glue (old). Joe Budd photos