Stilbite with Actinolite

Stilbite with Actinolite

The main component of this specimen is stilbite, with some actinolite surrounding it.  Stilbite, which is a serial name, is a zeolite, and actinolite is a very complex amphibole silicate mineral. The specimen was collected by the club co-founder Jim Nicholls on a visit to Mount Painter, in the Flinders range. E.South  Australia, an area of 800 million years old volcanic rock  The stilbite is a bright orange collection of radiating fibrous crystals, and the actinolite is an indistinct dark green deposit with just a few small observable crystals.