...only iu the older secondary rocks. It is closely allied to the living genus Terebratula. Pyrite». (Iron.)— A compound of sulphur and iron, found usually...like brass, and in almost every rock stratified and unstrutified. The shining metallic bodies, so often seen in common roofing slate, are a familiar example...

...occurring only in the older secondary rocks. It is closely allied to the living genus Terebratula. Pyrites. (Iron.) — A compound of sulphur and iron, found usually in yellow shining erystals like brass, and in almost every rock stratified and nnstratified. The shining metallic bodies,...

...LIMESTONE, PURBECK BEDS. Limestone strata belonging to the Wealden group. See Table II. G, p. 390. PYRITES (Iron). A compound of sulphur and iron, found usually...roofing slate, are a familiar example of the mineral. The word is Greek, and comes from nvp, pyr, fire, because, under particular circumstances, the stone...