This is a SHARP and unusual replacement, one which I had personally not seen before but I did verify with several oldtime collectors at the Springfield show. It is an approx 1 x 1 inch specimen (a full thumbnail) with a single upright, freestanding SHARP crystal of talc that has fully replaced a chondrodite. Phil Scalisi and a few others I showed it to said it was amazing for this material, and unusually sharp.