noun.
A dark brown amphibolemineral; a mixed silicate of iron and magnesium.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a dark brown mineral of the amphibole group; magnesium iron silicate
Word Usage
"The first recorded application can be traced to Finland (approximately 2500 B.C.), where anthophyllite from a local deposit was used to reinforce clay utensils and pottery."