Almandine
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Figure 1., page 116 of Gratacap, L. P. (1898): The Topography and Rocks of New York (New York Teachers' Monographs, April 1898)."Garnet, a variable silicate containing, on Manhattan Island usually alumina, iron, magnesia and lime. Garnets are plentiful throughout the island rock, dense concretions of them (the so-called seed ...