Pliny the Elder, Naturalis Historia 37.10, on quartz crystals: Quæ vero sine vitio sint, pura esse malunt, acenteta appellantes, nec spumei coloris, sed limpidæ aquæ. Those which are in fact flawless are preferred uncut and are called acenteta; and they are not cloudy in color, but of the color of clear water. Acentetum is from the […]

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