ˌ ̷ ̷ ̷ ̷ˈhēˌdrīt noun
( -s )
Etymology: German tetraëdrit, from Late Greek tetraedros having four faces + German -it -ite
: a fine-grained gray mineral (Cu,Fe) 12 Sb 4 S 13 that is isomorphous with tennantite, consists of a sulfide of copper, iron, and antimony and often also contains zinc, lead, mercury, or silver, occurs in characteristic tetrahedral crystals and also in massive form, and is often a valuable ore of silver and is also worked for copper (hardness 3-4, specific gravity 4.4-5.1)