Very sharp, typically bladed and disclike crystals of this rarely crystallized species, from THE classic locality in the US. This was not the first locality, but it has remained the best in the USA for sharp crystals and they are quite different in habit from the fine brucite found at a very few other lcoales (Kazakhstan, and South Africa) today. This piece has large, translucent crystals to 2 cm across, and combined with the overall size of the specimen is thus fairly significant. Ex. George Loud collection and University of Chicago Museum collection