"Slaggy" Quotes from Famous Books
 ... says:[19] "The most interesting fact with regard to the constitution of these Hungarian lavas, which in the central parts of their masses are often found to assume a very coarsely crystalline and almost granitic character, while their outer portions present a strikingly scoriaceous or slaggy appearance, remains to be noticed. It is, that though the predominant felspar in them is always of the basic type, yet they not unfrequently contain free quartz, sometimes in very large proportion. This free quartz is in some ...
— Round About the Carpathians • Andrew F. Crosse |
