Of the five volumes of the first edition (1962–1963) of DHZ that we all know so well, volume 4 was the thickest at 3.5 cm, and 435 pages. It covered feldspars, silica minerals, feldspathoids, scapolite, zeolites, and a scattering of other tectosilicates. Less than four decades later, in the 2nd edition, the feldspars alone take up nearly a thousand pages (!) in a volume fully 5 cm thick. Furthermore, printed in type 10% smaller than that used in the 1st edition, and with a larger area of each page (238 versus 222 cm2) used for text (+ figures...

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