The Collaborative International Dictionary
Needlestone
Needlestone \Nee"dle*stone`\, n. (Min.) Natrolite; -- called also needle zeolite.
Wiktionary
needlestone
n. (context mineralogy English) natrolite
Usage examples of "needlestone".
There were no paths, and they had to clamber over outcroppings of needlestone that glittered under the dust and would cut their feet deeply if they slipped.