amygdule

amygdule
/euh mig"doohl, -dyoohl/, n. Petrol.
one of the mineral nodules in an amygdaloid.
[1875-80; AMYGD(ALA) + -ULE]

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Secondary deposit of minerals found in a rounded, elongated, or almond-shaped cavity in volcanic rock.

The cavities (vesicles) were created by the expansion of gas bubbles or steam within lava. Because gas bubbles tend to rise through the lava, amygdules are most common near the tops of flows. Many minerals have been found as amygdules, including some spectacular museum specimens of zeolites.

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      secondary deposit of minerals found in a rounded, elongated, or almond-shaped cavity in igneous rock. The cavities (vesicles) were created by the expansion of gas bubbles or steam within lava. Some amygdules consist partially of lava, which indicates their formation during solidification of the rock. Since gas bubbles tend to rise through the lava, amygdules are most common near the tops of flows. The secondary minerals may form after the solidification of the lava; the gases may help to form the filling minerals. A great variety of minerals have been found as amygdules, including some spectacular museum specimens of zeolites.

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Universalium. 2010.

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  • amygdule — [ə mig′do͞ol΄, ə mig′dyo͞ol΄] n. [< L amygdala, ALMOND: from the typical shape] a small gas pocket, usually found in volcanic rock, partly or completely filled with a mineral, esp. a zeolite, calcite, or quartz: sometimes called amygdale [ə… …   English World dictionary

  • Amygdule — Amygdules form when the vesicular cavities (created by expanding gas bubbles in volcanic lava) are filled with a secondary mineral such as calcite, quartz, chlorite or one of the zeolites, which are deposited by having minerals wash through the… …   Wikipedia

  • amygdule — noun A rounded mass of secondary mineral found in volcanic rock …   Wiktionary

  • amygdule — GLOSSARY OF VOLCANIC TERMS An individual vesicle which has been subsequently filled in by secondary minerals …   Glossary of volcanic terms

  • amygdule — amyg·dule …   English syllables

  • amygdule — /əˈmɪgdjul/ (say uh migdyoohl) noun → amygdale …   Australian-English dictionary

  • amygdule — …   Useful english dictionary

  • pipe amygdule — noun : an elongated nodule resembling a tube in an amygdaloid …   Useful english dictionary

  • amygdale — a·myg·dale (ə mĭgʹdāl) n. An amygdule.   [From Latin amygdala, almond. See amygdala.] * * * …   Universalium

  • igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

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