... The matrix is rust of iron (or hydrous peroxide of iron and hematite), and in it are imbedded water-worn pebbles of sandstone and quartz... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...Some of the sandstone strata are dislocated by a hornblende rock and by basalt, the sandstone nearest to the basalt being converted into quartz...
David Livingstone 「Missionary Travels and Researches in South Africa」
... he's been salting myrocks with gold-bearing quartz...
Grant Allen 「An African Millionaire」
...As a rule the penguins were careful to selectrounded stones for their nests, but these fragmentsof quartz were jagged and uncomfortable, and mostunsuitable for nest building...
George Murray Levick 「Antarctic Penguins」
...The shell contained a piece of clear quartz crystal, and the bowl a moss agate...
Edward S. Curtis 「The North American Indian」
...Armlet of quartz crystal used in the formation of the medicinewater of secret orders...
James Stevenson 「Illustrated Catalogue of the Collections Obtained」
...Elora is a town in south-westernHindostan, noted for its splendid cave-temples, cut from a hillof red granite, black basalt, and quartz rock...
Marcius Willson 「Mosaics of Grecian History」
...The other specimen is aflat boulder of white quartz, obtained in Gasconade County, Missouri,which bears on one of its sides the mark of a naked foot, each toebeing distinctly scooped out and indicated...
Hugh Macmillan 「Roman Mosaics」
...Its texture is very compact and hard, frequently containingveins of quartz, which render it difficult to work...
Hugh Macmillan 「Roman Mosaics」
...In the Egyptian breccia are foundvery fine pebbles of red granite, porphyry of a darker or lightergreen, and yellow quartz, held together by a cement of compactfelspar...
Hugh Macmillan 「Roman Mosaics」
...Had Polter stolen thatmissing fragment of golden quartz the size of a walnut which had beenbeneath Dr...
Various 「Astounding Stories, March, 1931」
..."Guard this piece of golden quartz...
Various 「Astounding Stories, March, 1931」
...And above that, the outer surface, the summit of the fragment ofgolden quartz...
Various 「Astounding Stories, March, 1931」
...In a room of the biologicaldepartment there, the precious fragment of golden quartz lies guarded...
Various 「Astounding Stories, March, 1931」
..."Of course," he explained patiently, "and what if they are? What areall these machines but inanimate mechanisms, things of metal andrubber and quartz...
Various 「Astounding Stories, July, 1931」
...Like the buildings they had seen, thisalso constructed of opalescent quartz...
Various 「Astounding Stories of Super-Science, December 1930」
...It is also perfectlytransparent to ultra-violet light,being superior even to rock crystal orfused quartz in that respect...
Various 「Astounding Stories of Super-Science, December 1930」
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