volcanic glass - meaning and definition. What is volcanic glass
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What (who) is volcanic glass - definition


Volcanic glass         
  • A sand grain of volcanic glass under the [[petrographic microscope]]. Its amorphous nature makes it disappear in cross-polarized light (bottom frame). The scale box is in millimeters.
MATERIAL
Volcanic Glass; Maui Diamonds
Volcanic glass is the amorphous (uncrystallized) product of rapidly cooling magma. Like all types of glass, it is a state of matter intermediate between the closely packed, highly ordered array of a crystal and the highly disordered array of liquid.
volcanic glass         
  • A sand grain of volcanic glass under the [[petrographic microscope]]. Its amorphous nature makes it disappear in cross-polarized light (bottom frame). The scale box is in millimeters.
MATERIAL
Volcanic Glass; Maui Diamonds
¦ noun another term for obsidian.
Volcanic rock         
  • {{okina}}A{{okina}}ā next to pāhoehoe lava]] at the [[Craters of the Moon National Monument and Preserve]], Idaho, United States.
  • Le Maitre, R.W.}} (''ed.''); 1989: ''A classification of igneous rocks and glossary of terms'', Blackwell Science, Oxford.
  • A German example of [[latite]], a type of volcanic rock
  • Photomicrograph of a [[volcanic lithic fragment]] ([[sand grain]]); upper picture is plane-polarized light, bottom picture is cross-polarized light, scale box at left-center is 0.25 millimeter.
  • Vesicular olivine basalt from [[La Palma]] (green [[phenocrysts]] are [[olivine]]).
  • sp=us}} piece of [[pumice]] supported by a rolled U.S. $20 bill demonstrates its very low density.
  • A sample of rhyolite
  • Amsterdam Island]] in the Indian Ocean
  • Volcanic rocks, [[Porto Moniz]], [[Madeira]]
ROCK FORMED FROM LAVA ERUPTED FROM A VOLCANO
Volcanic Rock; Lava rock; Effusive rock; Volcanite; Igneous volcanic rock; Axiolitic; Volcanic rocks; Lava stone; Volcanics; Black volcanic rock; Subalkaline igneous rocks; Subalkaline volcanic rock; Alkaline volcanic rock; Peralkaline volcanic rock
Volcanic rock (often shortened to volcanics in scientific contexts) is a rock formed from lava erupted from a volcano. In other words, it differs from other igneous rock by being of volcanic origin.