FLINT GENUS. tated agate. n. Petrefaaion agate. 12. Coral agate, and 13. Jafper agate. j. Landfcape agate, appears to be compofed of jalper, chalcedony, and hornftone. 2. Ribbon and zoned agate, are to be confidered the fame, the difference in colour ds* lineation being produced by the particular direaion in which the ftone is cut. When it is cut perpendicular or oblique to the layers of which it is compofed, ribbon agate is formed; but, when parallel with the layers, we obtain zoned agate. It is form ed by the difpofition of the layers on a pyramidal inequality, which is generally quartz. 3, Mofs agate. Here jafper of various colours* as brown, yellow, &c, appears fwimming in a chalcedonic bafis. The jafper refeinbles mofs, and when its arborarations are dif- tincl is very beautiful. Its mode of forma tion appears to be different from the p re ' ceding j according to Werner it has been formed more by a kind of geiatinifaticm* than by a fucccffive depofition. 4. Tube or tubular agate, is compofed of tubes of chalcedony and carneiian, and foine- limes jafper, which are commonly fdled with another fofhl. When it is cut trattf- verfely it exhibits a circular or zoned de lineation, but the zones arc nor fo diftm^ as in the zoned agate, and the circle is