This specimen features two large interlocking datolite crystals, the largest of which is 5.2 cm. The internal colour varies from yellowish-green to a cool-toned pale green, and the lustre on this one is mostly matte, with a few glassy faces as well. Small pyrite crystals and tetrahedrite-coated chalcopyrite crystals occur on, partially submerged and completely frozen inside the crystals at the top of the specimen - and this part of the crystal is transparent enough that it is easy to see the sharp little pyrite cubes suspended inside the datolite - very cool. There is damage at the bottom of the larger crystal and there is a contact behingd the right side of the upper crystal, but neither is a factor when displayed as photographed.  Nice datolite with such cool inclusions.