vein quartz


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vein quartz

[′vān ‚kwȯrtz]
(petrology)
A rock composed chiefly of sutured quartz crystals of pegmatitic or hydrothermal origin of variable size.
References in periodicals archive ?
Such veins are generally not crystal-bearing but are an important source of industrial-grade vein quartz.
Larger veins of this type have been known to yield several tens of thousands of tons of vein quartz and several dozen tons of quartz crystals.
After drilling through loose sand to 25 meter depth (Kalahari Formation), a sequence of limestone breccias mixed with vein quartz and biotite rich shales was intersected to the end of the hole depth of 143 meters.
Rock Glacier: A jumbled mass exceeding a million tons of ice bound soil, cobbles and boulders contains abundant rubble of vein quartz that is highly anomalous in gold, with assays up to 6.
The boulder was roughly 50 cm in diameter, and consisted of white vein quartz with accessory galena and chalcopyrite.
The main ore body, however, being the limestone, in which occur irregular pipes, streaks and bunches of a white, siliceous material, rather porous, and not vein quartz but is usually very rich - samples having assayed as high as 27 opt.
The conglomerates consist predominantly of well-rounded pebbles and cobbles of vein quartz, quartzite and schist that are lithologically similar to the White Channel Gravels in the Klondike district.
Random chip samples of cobbles of vein quartz are highly anomalous in gold with assays up to 6.
Two principal hosts for high grade gold mineralization have been identified in the area: a) vein quartz and related silicified breccia with minor sulphide and b) dark sulphide healed breccia.
Outcropping vein quartz at Aloe Rek, approximately 100 metres from the Victory Vein zone, assayed up to 1.
Vein quartz chip samples in this area consistently assayed significant values (5 - 7 grams per tonne gold).
The source of the gold appears to be vein quartz hosted in archaean metasediments.