...It was a knife of beautifulworkmanship, fashioned from obsidian and obviously the work of humanhands... 
Various 「Astounding Stories, August, 1931」
...The bottom of the brook was paved with pretty stonesand bits of glassy obsidian...
Edgar Rice Burroughs 「Tarzan the Terrible」
...Therewere bits of obsidian and choice feathers for arrows, some pieces offlint and a couple of steel, an old knife, a heavy bone needle, andstrips of dried gut...
Edgar Rice Burroughs 「Tarzan the Terrible」
...Similarly in 1897 the largest Beaver pond in thePark was at Obsidian Cliff...
Ernest Thompson Seton 「Wild Animals at Home」
...The finest arrows were furnished with points made of obsidian, orvolcanic glass, which was obtained in the vicinity of Mono Lakeon the eastern side of the Sierras...
Galen Clark 「Indians of the Yosemite Valley and Vicinity」
...There is no chert or similar materialfrom which chipped implements can be made; nor, as would naturally beexpected, is there any obsidian suitable for such manufacture...
Gerard Fowke 「Archeological Investigations」
...A notable absence of fragments of obsidian, the presence of whichin abundance is characteristic of ancient ruins, was observed on thesite of Payüpki...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...It is a remarkable fact that these latter symbols are practically thesame as those used by Nahuatl people for obsidian arrow- or spearpoints...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...They are made of many different kinds of stone, but thoseof obsidian are the most numerous...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...Stone knife of obsidian, with string for suspension, used inceremonial scalp taking—one of which is carried on journeys byeach member of the Priesthood of the Bow, or Order of the Knife...
James Stevenson 「Illustrated Catalogue of the Collections Obtained」
...A lot of flakes of obsidian, flint, etc...
James Stevenson 「Illustrated Catalogue of the Collections Obtained」
...Only black obsidian covered the floor about us...
Various 「Astounding Stories, April, 1931」
...Turreted onall four corners, constructed of materialwhich looked like blocks ofnatural glass, the fairylike structurewas crowned by a gigantic tower ofsomething which resembled obsidian...
Various 「Astounding Stories of Super-Science, December 1930」
...Between obsidian eyes was a fissure whence emanated a wailing and afoul odor...
Various 「Astounding Stories of Super-Science, August 1930」
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