...This last, impregnated with salt and veined withcrystalline gypsum, is a friable material, and unsuited for ornamentation... 
Gaston Camille Charles Maspero 「Manual Of Egyptian Archaeology And Guide To The Study Of Antiquities In Egypt」
...This friable material must be protected at allvulnerable points with slabs of stone in order quickly to divert thewater and preserve the roofs and walls from destruction...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...Its friable natureleaves it always open and light, and at all times in the absence offrost, accessible to the spade or the hoe...
Lewis Falley Allen 「Rural Architecture」
...The whole mass is very friable, and inevery direction the soft rock is hollowed out into sepulchral caves...
Hugh Macmillan 「Roman Mosaics」
...The stone is so friable thatnames can be cut in it to almost any depth with a pocket-knife: soloose, indeed, is it, that one almost feels alarmed lest it should fallwhile he is scratching at its base...
Ernest Giles 「Australia Twice Traversed, The Romance of Exploration」
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