This is a very cool, different specimen from this find. The hemisphere of deep golden yellow stilbite crystals sits as a crest on top of a mixture of deep green pargasite crystals intergrown with stilbite crystals. The surface of the stilbite ball is more uniform than many others from here, in that there is less separation of crystal groups and less “topography” – it’s not smooth, but individual crystals are not as defined. This stilbite is of the best colour. In very good condition, there is a bit of chipping in spots, mostly at the periphery. A stand-out spash of colour in the display case, a great piece.
Please note that although the dark green amphibole was labelled pargasite, I am not certain as to the extent of analysis that has been done on this material. In the Mineralogical Record article on these localities by Rock Currier and Demetrius Pohl (May-June 2011, 42:3), the authors indicate that the amphibole was confirmed by Raman specrtorscopy to be high in sodium and therefore in the pargasite range of composition. However, I am unclear as to whether further confirmatory analysis has been completed since the date of publication.
About These Stilbites