Dims: 2.5" x 2.1" x 0.9"(6.4 x 5.3 x 2.3 cm)
Wt: 3.57 oz.(101.2 g)
If I didn't know any better, I would swear that this specimen was actually a clam shell! This Biotite specimen is one of the weirdest that I have ever seen. It shows no hexagonal crystal form whatsoever, and has no straight edges or faces on it. It is shaped like a flattened, round nodule and has the black-brown color, pearly luster, and flaky, micaceous tendencies that one would expect from Biotite. The cleavage plane is aligned so that the flattest surfaces of the nodule correspond with what would be a crystal's basal faces. There appear to be tiny slivers of albite on both of these faces. If you have more knowledge of this type of Biotite specimen than I do, please write me and tell me about it, particularly details about its formation.