The Collaborative International Dictionary
Boltonite
Boltonite \Bol"ton*ite\, n. (Min.) A granular mineral of a grayish or yellowish color, found in Bolton, Massachusetts. It is a silicate of magnesium, belonging to the chrysolite family.
Wiktionary
boltonite
n. (context mineral English) A granular chrysolite mineral of a greyish or yellowish color.