6cm
Dimensions: 6cm

Description: I wouldn't have guessed that this would come back as epistilbite because of its fibrous nature... but maybe it's not the fibrous stuff that he tested? That's my suspicion at least - maybe there's some fibrous material growing on epistilbite? The sample I sent in didn't have any loose fibers, it was just the substrate (I think). Sending the whole thing in the mail would have been more illuminating, but it's as mentioned fragile.