A Mohican hairstyle on a glass model? An anorexic stegosaur?
Neither of these. This is a zeolite mineral called natrolite, from Ridgley in north western Tasmania. It usually forms long slender prisms that have a square cross-section. It is a mineral that generally occurs in cavities in basalt rock.
This particular specimen now resides in a collection in Queensland after having being purchased in one of my auctions.