Dictionary.net

• A mineral of a bluish gray color and metallic luster, usually in plumose masses, also compact. It is a sulphide of antimony and lead.

2010 - New Age Dictionary Database
By Oddity Software

• A mineral of a bluish gray color and metallic luster, usually in plumose masses, also compact. It is a sulphide of antimony and lead.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.