Marcasite
a bisulphide of iron.
The term includes several varieties of iron pyrites, which have been named after the form they present: viz., cellular pyrites, cockscomb pyrites, hepatic pyrites, or leberkies, etc. It is used in the manufacture of sulphur, sulphuric acid, and sulphate of iron; but not to so great an extent as the ordinary sulphide.
MARCELLINUS (-sel-li'nus), a Pope and saint, succeeded Caius in 296. He signalized himself by his courage in a severe persecution. The Donatists charged him with having sacrificed to idols; from which accusation he was vindicated by Augustine. He died in 304.
MARCELLUS (-sellus), I., Pope, succeeded Marcellinus in 308. The Emperor Maxentius banished him from Rome for excommunicating an apostate.
He died in 310.
MARCELLUS II., succeeded Julius III. in 1555, but died a few weeks after his election.