Some of the constituents are new to mineralogy.

Pane 4k.

28. Of the constituents of meteorites, the following are by many mineralogists regarded as being at present unrepresented among the terrestrial minerals:—

Cliftonite, a cubic form of graphitic carbon,

Phosphorus,

Various alloys of nickel and iron,

Moissanite, silicide of carbon,

Cohenite, carbide of iron and nickel; corresponding to Cementite, carbide of iron, found in artificial iron,

Schreibersite, phosphide of iron and nickel,

Troilite, proto-sulphide of iron,