This article is about the small crystals that can form in solidifying lavas. For tantalum mineral, see Microlite. For lightweight, slow-flying airplanes, see Microlight.
Microlites are minute crystals in an amorphous matrix. In igneous petrology, the term microlitic is used to describe vitric (glassy, non-crystalline, amorphous) matrix containing microscopic crystals.[1] Microlitic rocks are a type of hypocrystalline rocks.[2] Unlike ordinary phenocrysts, which can be seen with little or no magnification, microlites are generally formed in rapidly cooled (quenched) basaltic lava, where cooling rates are too high to permit formation of larger crystals.
Microlites are sometimes referred to as “small quench crystals”.[3] They form more easily in basaltic lava eruptions, which have relatively low viscosity. Low viscosity permits rapid nucleation and ion migration, necessary for crystal formation. The high silica content of rhyolitic lavas gives them much higher viscosities.[3] Such lavas tend to form glass (obsidian) when they cool rapidly from a fully melted liquid state; though many obsidians also contain microlites.[2] Low viscosity mafic magmas must be quenched very rapidly from a high temperature to form glass that is free of any crystalline content.[3]
Microlites have been found in volcanic ash collected from Hawaiian lava fountains, where rapid cooling favors their formation. Sideromelane is a light brown basaltic glass, also formed in these eruptions, with and without microlites.
^Dictionary of Geological Terms, 1962, American Geological Institute
^ abPetrology The Study of Igneous...Rocks, Loren A. Raymond, 1995, McGraw-Hill, p. 27
^ abcSchmincke, Hans-Ulrich, Volcanism, 2004, Springer-Verlag, Chapter 12, Fire and Water, Rapid Cooling.
Microlites are minute crystals in an amorphous matrix. In igneous petrology, the term microlitic is used to describe vitric (glassy, non-crystalline, amorphous)...
Microlite was once[when?] known as a pale-yellow, reddish-brown, or black isometric mineral composed of sodium calcium tantalum oxide with a small amount...
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series consisting of tantalite-(Fe), tantalite-(Mn) and tantalite-(Mg)), microlite (now a group name), wodginite, euxenite (actually euxenite-(Y)), and polycrase...
augite and olivine, but all these minerals very frequently occur mainly as microlites or as skeletal growths with sharply-pointed corners or ramifying processes...
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Queiroz, A. A. A. E.; Andrade, M. B. (2022). "Prospection of pyrochlore and microlite mineral groups through Raman spectroscopy coupled with artificial neural...
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Ekeberg[when?] at Ytterby, Sweden, and Kimoto, Finland. The minerals microlite and pyrochlore contain approximately 70% and 10% Ta, respectively. Tantalum...
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