2 12 FLINT GENUS. Fracture delicately and coarfely fibrous, ftraight* and ftellularly and fcopiformly fibrous, alfo fplintery. Fragments wedge fhaped. It occurs in large and coarfe grained, fometimes in fmall grained diftinft concretions. Tranflucent. Semi-hard in an inferior degree. Brittle. Eafily frangible. • Intermediate between not particularly heavy and light. Constituent Parts, Silica Alumina 4 r »° 3 1 * 0 11,0 *5>° Lime Water According to Mey er " Its geognoftic and geographic fituations are the fame with the following fubfpecies. THIRP
