Granite may have more alkali feldspar, whereas a granite derived from partial melting of metaigneous rocks may be richer in plagioclase. It is on this basis that the modern "alphabet" classification schemes are based. The letter-based Chappell & White classification system was proposed initially to divide granites into I-type (igneous source) granite and S-type (sedimentary sources). Both types are produced by partial melting of crustal rocks, either metaigneous rocks or metasedimentary rocks. M-type granite was later proposed to cover those granites that were clearly sourced from crystallized mafic magmas, generally sourced from the mantle. However, this proposal has been rejected by
Fall River granite steeples was constructed of Fall River granite. Unfortunately this building was destroyed by fire on May 11, 1982. The Chateau-sur-Mer mansion in Newport, Rhode Island is perhaps the best example of Fall River granite being used for private home construction. Fall River granite Fall River granite is a Precambrian bedrock underlying the City of Fall River, Massachusetts and surrounding areas along the eastern shores of Narragansett Bay. It was formed 600 million years ago, as part of the Avalon terrane. During the 19th century, the City of Fall River, Massachusetts became famous for the granite rock on which much of