Microlites


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Microlites

 

fine microscopic prismatic crystals of plagioclase and other rock-forming minerals that are included in or form the entire semivitreous groundmass of effusive rocks. Microlites differ from phenocrysts and crystallites, that is, the smallest nucleating crystal formations, in that they are produced during the devitrification of volcanic glass.

References in periodicals archive ?
Cashman (1993) proposed that curved CSDs can be produced at a constant cooling rate if there is a change in the nature of the precipitating phases (megacryst and microlite).
The phenocrysts are alkali feldspar (Or60-65) [+ or -] clinopyroxene (Wo46-49Fs14-20) [+ or -] plagioclase (An14-16), pseudomorphosed leucite, amphibole, and biotite in a hypocrystalline to glassy groundmass containing microlites of alkali feldspar, biotite, and clinopyroxene [+ or -] biotite [+ or -] amphibole [+ or -] magnetite [+ or -] Ti-andradite [+ or -] haematite.
Other rarities occurring in the pegmatites of this area include microlite, hambergite and rhodizite (Antandrokomby is one of the world's richest sources of this mineral).
Rare monocrystalline sand grains of clinopyroxene are also present, as are microlitic lithic fragments (plagioclase microlites set in nearly opaque tachylitic glass) probably derived from chilled lava surfaces or basaltic tephra.
Ten microlites of virus at a concentration of 10,000 PFU/well was then added to each of the test wells.
The cocktail shakers gleam with the promise of strange and exotic drinks while the microlites and glowing glass features blend different colours intothe decor.
Although no sulfate microlites are present in the quartzine, these possible relic gypsum textures are similar to those occurring in Permian beds on Bear Island, Svalbard near Spitsbergen.
A reaction vessel coated with a thin layer of titanium dioxide is filled with the aqueous dye solution and the 9W UV-A lamp (a Philips PL-S9W/10 fluorescent lamp, Microlites Scientific, Scarborough ON) is switched on once the solution reaches the desired temperature.
His wealth allows him to pursue two hobbies - flying microlites and climbing.
The texture of the rock is porphyritic aphanitic with phenocrysts surrounded by microcrystalline matrix made of microlites of euhedral plagioclase grains.