4 I 132 ‘ FLINT GENUS. figure interfect one another and form a cel* lural ft ape. The truncating planes & e fmooth, but the others are ftreaked. Externally its luftre is generally fplendent; Inter' nally it alternates from gliftening to Alining, and 15 ■ vitreous. fl Fra£tui;e fine grained uneven; in the tranfl u ' ; cent varieties it fometimes approaches to fplinteryi in the tranfparent varieties, to fmall and imp er ' fectly conchoidal. Fragments indeterminately angular ftarp edged. The maffive occurs in curved lammellar difti* 1 ^ concretions, whofe furface is ftining and ftreaked. It alternates from perfectly tranfparent to weakly tranflucent. Pretty hard, yielding to the file. Very eafily frangible. Not particularly heavy, approaching to the he^ v )' Specific gravity—From 3,213 to 3,300, Hauy.— Kirivan 3,250, Gerhard. i 4 Chemical Characters. Before the blow pipe it melts eafily, without tion, into a greenift white femitranfparent gla^ Lclievrc. tomtit**