An Elementary Introduction to the Knowledge of Mineralogy Including Some Accoun
An Elementary Introduction to the Knowledge of Mineralogy Including Some Accoun
William Phillips
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* The Garnet is a reddish, yellowish, greenish, or black- ish brown colour ; it is found in small granular masses, and crystallized in the form of the dodecahedron with rhomboidal planes, which is considered to be the form of its primitive crystal. It also occurs in crystals having 24 trapezoidal faces ; only 5 or 6 varieties have been described. It is harder than quartz, but not so hard as the alamandine. It is rarely transparent, frequently opake. It consists of 43 parts of silex, 16 of alumi...ne, 20 of lime, and 16 of oxide of iron. The alamandine, allochroite, melanite, aplome and garnet, are commonly arranged together under the lat- ter name ; but their elementary constituents do not cor- respond. Garnets are very abundant ; they principally occur dis- seminated among some of the older rocks, as micaceous schistus, serpentine, and gneiss, and sometimes in granite. They are met with in most countries in which those rocks occur, and sometimes are so plentiful as almost to constitute the mass.
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