06-27. Natrolite #3.
Either porcupine or crystal needles – the geometry of the natrolite inspires some strange design. Something to ponder on later I guess.
There are times even the scientist seem to agree to this: Here is the title of their paper: Flexibility and distortion of the framework of natrolite crystal structures.
From a resource by Baur, Kassner, Kim, and Sieber.