Noun

Rock that contains utilitarian materials; primarily a rock containing metals or gems which—at the time of the rock's evaluation and proposal for extraction—are able to be separated from its neighboring minerals and processed at a cost that does not exceed those materials' present-day economic values.

* {{quote-magazine, date=2014-04-21, volume=411, issue=8884, magazine=(The Economist)

, title= Subtle effects , passage=Manganism has been known about since the 19th century, when miners exposed to ores containing manganese, a silvery metal, began to totter, slur their speech and behave like someone inebriated.}}

Noun

(-)

* {{quote-book, year=1566, author=William Adlington, title=The Golden Asse, chapter=, edition= citation

, passage=When their father and mother beheld them weep and lament still, they doubled their sorrowes and griefes, but full of yre and forced with Envy, they tooke their voyage homeward, devising the slaughter and destruction of their sister. }}