This piece features twinned K-feldspar crystals (adularia variety), and wonderful delicate green amphibole crystals (byssolite variety). The byssolite crystals stand well up off the matrix. In excellent condition overall, a couple of missing adularia tips. The alpine pocket that produced these specimens was found in the 1960s, just as the quarry closed operations (it is now flooded, overgrown and off-limits to collecting). From the John S. White Pennsylvania Collection – prior to that, it was in the Haefner collection, acquired by John through K. Hilmer.