volcanic glass


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volcanic glass

[väl′kan·ik ′glas]
(geology)
Natural glass formed by the cooling of molten lava, or one of its liquid fractions, too rapidly to allow crystallization.
References in periodicals archive ?
Thus, the volcanic glass is altered to clay minerals at the top and different types of zeolites form below.
The electron microprobe analyses (Table 1) of the volcanic glass shards reveal that the ash is a highly silicic, moderately potassic rhyolite.
Minute volatile particles of volcanic glass can form a stable deposit on a slope falling at an angle of 6[degrees] only if a single condition is met: it would have to be covered rapidly by the sediments--otherwise, wind and water would rapidly destroy it.
The White River Group is known to be high in volcanic glass (Denson and Bergendahl 1961).
The researchers focused on ancient objects made of the volcanic glass called obsidian.
Or alternatively, that the A horizons are enriched on zircon grains relative to other minerals and volcanic glass due to the fact that zircons are very stable grains and could survive severe weather conditions.
Ranger Kupono McDaniel said he once was five miles from the flow when a large piece of volcanic glass struck him in the eye.
Research during the 1970s has indicated that all Thessalian obsidian tools were made from the raw material of the island of Melos (Theocharis 1973; 180), the only Aegean source of this volcanic glass.
Pillow laves form by the eruption and "quenching" of magma on the seafloor--cooling is so fast that volcanic glass forms on the rims of pillows Slightly slower cooling within pillows produces crystalline basalt.
The ratio in the Earth's water and in water from specks of volcanic glass trapped in crystals within moon dust match the ratio found in the chondrites.
They are not, of course, real diamonds, but rather an unusual clear volcanic glass made of almost pure silica.
Indeed, Manga and his colleagues found evidence of the repeated fragmentation and consolidation of magma when they examined samples of banded obsidian, a type of volcanic glass, formed during an ancient eruption of Big Glass Mountain.