... The colour is a sunburnt black, tinted ferruginous red like meteoric stones, and it is generally friable, crumbling under the nails... 
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...If it is long boiled it becomes agranular, friable solid, yielding upon expression, a yellow, insipid,fixed oil...
Robert Jennings 「Sheep, Swine, and Poultry」
...The floor of the ulcer is formed by a grayish-yellow,corroded surface, under which the tissue is transformed into a dry, friable, orfirm cheesy mass...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Over this a laterstratum was deposited called tufa granolare, consisting of a similarmechanical conglomerate of scoriæ, ashes, and other volcanic products,but more porous and friable in texture...
Hugh Macmillan 「Roman Mosaics」
...It is loose, friable, worthless in itself...
Henry Warren 「Recreations in Astronomy」
...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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slender augustine princeton
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