Note the large crystal impression that was already pointed out in previous shots. However, in this shot you can also see several more crystal impressions. These "holes" are where crystals of other chemical compositions were formerly lodged. When you see the clearly defined shapes that are hexagonal, trigonal, or orthorhombic you know a crystal of some kind was a former resident!

Further information on crystal systems can be found at http://www.yourgemologist.com/crystalsystems.html.

Note the large crystal impression that was already pointed out in previous shots. However, in this shot you can also see several more crystal impressions. These "holes" are where crystals of other chemical compositions were formerly lodged. When you see the clearly defined shapes that are hexagonal, trigonal, or orthorhombic you know a crystal of some kind was a former resident!

Further information on crystal systems can be found at http://www.yourgemologist.com/crystalsystems.html.