- Miniature, 3.3 x 2.9 x 3.1 cm
- Pikes Peak, Teller Co., Colorado, USA
Here is a twinned feldspar crystal, very sharp as if carved, that was collected by Ed Over and passed on to his friend Art Montgomery for sale. Art drew on the crystal surfaces to illustrate the twinning crystallography. Ex. Dr. Mark Feinglos Collection.