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 Bowl Washington-Wilkes. In 2003, the stadium celebrated its 50th season since opening in 1952. The Granite bowl's score board is the same scoreboard that the University of Georgia used in Sanford Stadium. It was the scoreboard that was used before the stadium was enclosed and renovated. This scoreboard is also the same one that was used during Georgia's 1980 national championship season. One of the many traditions involved with the Granite Bowl Stadium is touching the spirit rock atop the closed end of the stadium before each game. Hudson Cone, a spokesman for the Granite Association, states that the rock is