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
Granite City, Illinois granting tax incentives, and adding new zoning restrictions. The original design of what is currently downtown Granite City is based on the City of Washington D.C. West Granite is located west of downtown across the railroad lines. West Granite contains both industrial and lower income residential areas and has been struggling to fight its above average crime rate. While Wilson Park may be the Heart of Granite City, West Granite is the History. Attracted by the promise of plentiful jobs, many immigrants from Central-Eastern Europe, primarily Bulgaria, Macedonia and Hungary, migrated to the City in search of good jobs with