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Charles Whitman Cross
Charles Whitman Cross (September 1, 1854 – April 20, 1949) was an American geologist. He was educated at Amherst College, the University of Göttingen, and Leipzig University. A petrologist, much of his field work concerned rocks in Colorado. He and three other geologists proposed the CIPW norm that is still used in normative mineralogy. He was also active in scientific societies and institutions.
==Early life and education==
Cross was born September 1, 1854, in Amherst, Massachusetts, to Maria Mason Cross and the Rev. Moses Kimball Cross. Later his family moved to Waverly, Iowa, where he graduated high school. In 1872 he entered the Scientific Course at Amherst College. After earning a bachelor of science degree in 1875, he remained at Amherst doing post-graduate studies in science. He attended the University of Göttingen from 1877 to 1878, when he transferred to Leipzig University. There he studied under Ferdinand Zirkel and earned his Ph.D. in 1880.
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