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PIPE AMYGDULE [1 record]

Record 1 1999-09-16


Subject field(s)
  • Petrography
  • Vulcanology and Seismology

An elongate amygdule that occurs in a lava, towards the base of the flow, probably formed by the generation of gases or vapor from the underlying material.


Occasionally elongated cylindrical cavities (pipe amygdales) occur at right angles to the surfaces of the lava flow. They are formed when lava flows over a patch of wet ground, e.g. a spring, the steam so evolved penetrating the lava, leaving tubes behind.


The term amygdale is preferred in British usage.


  • Pétrographie
  • Volcanologie et sismologie

[...] les amygdales tubulaires, emplies ou non de minéraux fumerolliens et formées lors du départ des gaz de la base de la coulée; les spiracles emplis de roches arrachées au substratum, sont asymétriques.


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