su ALCUNI TERRENI ALLUVIONALI ECO. 



07 



TABELLA 4'i 



Sabbie in stato naturale 



Percentuali dei minerali componenti 



[Oro 



i 

 Quarzo .... 



Calcedonio e pironiac 

 I llnieiiile e niagiiotite 

 I Spinello .... 

 ! Rutilo .... 



Ottaedrite e brookite 

 j Cai'l'onati 



Ortoclasio . . . 



I 



I Mici'oclino 



Plagioclasio . 



i Pirosseno trimetrico 



Diopside ed augi te 

 i 

 Diallagio .... 



Treiuolite . . 



Attinoto .... 



Onieblenda verde . 



Ornebleuda basaltica 



Glaucofane . 



Granato .... 



Olivina .... 



Zircone .... 



Andalusite 



0.0 

 66.8 

 0.3 

 2.0 

 0.0 

 0.1 

 0.0 

 0.1 

 4.7 

 0.8 

 2.3 

 0.3 

 0.2 



O.I 

 0.2 

 3.4 

 0.5 

 0.0 

 4.3 

 0.0 

 U.3 

 0.0 



11 



64.4 

 0.9 

 (t.6 



0.1 



4.8 

 2.5 

 0.3 

 2.6 

 0.3 

 0.1 

 0.0 

 0.2 

 0.1 

 1.9 

 0.2 



2.5 



0.2 



111 



60.5 

 0.1 

 2.5 



0.4 



0.0 

 4.0 

 0.3 

 1.6 

 0.1 

 0.1 



0.3 

 0.7 

 4.9 

 0.7 

 0.0 

 4.2 

 0.0 

 0.5 

 0.0 



IV 



65.2 

 0.5 

 2.3 



0.2 

 0.0 

 0.0 

 5.5 

 0.7 

 1.9 

 0.1 

 0.1 

 0.0 

 0.3 

 0.7 

 4.2 

 0.6 



2.6 

 0.0 

 0.6 

 0.0 



