This is an interesting piece of Calcite & Thomsonite, the Thomsonite is kind of noodle-like while having associated growth of needle-like Calcite over the top. Thomsonite is generally known to have associations with Prehnite, Laumontite, Natrolite, Chabazite, Analcime, Apophyllite and Chlorite.

I acquired this specimen from Tony at Mineral Store Australia at the August 2016 Sydney Crystal Show.