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’^o Calcareous Genus. fhells compadfed together, found in thc neigh- bourhood of Syracufe, Palermo, and the pro- montory of Pafforo in Sicily. Borcb Lithologie des .Siciiiens, 287. 2d variety. Marly Tufa. This is alfo yellow- iih white, refembüng mortar, and frequently contair-s lmall fhells, deftitute of luftre and tranf- parency, and very porous •, its fradture earthy, its hardnefs from 6 to 8. See the fpecimen, Leße, § 571. ^d variety. Staladiitic Tufa. This confifts of whitilh grey fiftulous concretions varioufly rami- fied or cumpadted together, or of brownifh grey concretions refembling mofs; both exceeding light and brittle, devoid of luftre and tranfpa- rency ; their fra&ure earthy hardnefs, from 6 to 7. Second Clafs. Indurated. ift Family. Compaä Limeßone. This term is here taken in a technical fenfe to exprefs a particular fraäure already explained. Its colour is ufually grey, blended with va- rious fhades of other colours, as dark or light grey, bluilh grey, yellöwifh grey, pearl grey, blackilh grey, lefs commonly greyilh white, Ila- bella yellow or och re yellow, or flefh or brownifli red, or greenidi grey, or greyiflrv black; offen