Zeolites

Bob's little sample from the Aliakmon.

The radiating crystals are characteristic of zeolite, but what sort of zeolite, remains unknown for now. The diameter of the largest radiating mass is about 0.3 cm.

Note the Zeolites, in a vein, that cross cuts older black veinlets of serpentine in (yet older) a pervasively serpentinized peridotite.