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The look of any quartz countertop compares to granite in that the colors are deep and consistent. [5] The process of creating the countertops is different than granite, in that it is an engineered product, consisting of a minimum of 93% quartz and 7% epoxy binder and dyes. [6]
Carrara marble, or Luna marble (marmor lunense) to the Romans, is a type of white or blue-grey marble popular for use in sculpture and building decor. It has been quarried since Roman times in the mountains just outside the city of Carrara in the province of Massa and Carrara in the Lunigiana , the northernmost tip of modern-day Tuscany , Italy.
α-quartz crystallizes in the trigonal crystal system, space group P3 1 21 or P3 2 21 (space group 152 or 154 resp.) depending on the chirality. Above 573 °C (846 K; 1,063 °F), α-quartz in P 3 1 21 becomes the more symmetric hexagonal P 6 4 22 (space group 181), and α-quartz in P 3 2 21 goes to space group P 6 2 22 (no. 180).
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2 kalsi 3 o 8 + 2 h 2 co 3 + 9 h 2 o → al 2 si 2 o 5 (oh) 4 + 4 h 4 sio 4 + 2 k + + 2 hco 3 − Climatic variations also influence the weathering rate of granites. For about two thousand years, the relief engravings on Cleopatra's Needle obelisk had survived the arid conditions of its origin before its transfer to London.
The following list of mines in the Philippines is subsidiary to the Lists of mines in Asia article and Lists of mines articles. This list contains working, defunct and future mines in the country and is organised by the primary mineral output(s) and province. For practical purposes stone, marble and other quarries may be included in this list.