256 TRAVELS THROUOH 



This matrix or large vein runs a long way in the 

 hills della Maremma y between Gerfalco e Prat a to- 

 wards Roccaftrtda : where covered with limeflone, 

 it is calcareous ; where, with Galeftro, it is moftly 

 compofed of vitrefcent materials. Upon the 

 whole, it may be confidered as a confufed union 

 of limeftone, marl, quartz, fpath, pyrites, and 

 marcafites , yellow fprinkled copper-mine, blende, 

 lead-ore with fome filver, magnefia, black iron- 

 ore, glofTy and magnetic mica, and quartz-cryflal- 

 lizations. But thefe materials are not diftributed 

 alike every where. In fome places different mate- 

 rials are predominant; for example, near Gerfalco 

 it Is magnefia; alia merfa di Bochejano, it is copper 

 and iron ; and here the matrix is almoft entirely 

 quartz, this part being covered with Galeftro. In 

 ihort, this great vein conilantly covers the flate. 

 Beyond Bolro di Cagnano alia Carbonaje di Montieri 

 (a valley defcending from the high mountain of 

 Montieri) towards the Weft the above vein appears 

 in the fummit of a hill, called Pogglo del Duca 

 Salv.ati, and it is here begins the limeftone of this 

 vein -, which, hereabout, is called travertine or 

 columbino, and is the only ftone in thefe parts 

 that yields a good white and lafting quick-lime. 

 It ;s extremely fpungy, without any regular Grati- 

 fication, deftitute of marine bodies, and entirely 



refembling 



