microperthite

microperthite

[¦mī·krō′pər‚thīt]
(mineralogy)
Perthite in which the lamellae are visible only under the microscope.
References in periodicals archive ?
Minerals include quartz, K-feldspar, (microperthite, microcline), plagioclase, aegirine-augite, hornblende, titanite, epidote and magnetite.
The rock comprises K-feldspar (microperthite, microcline), plagioclase (minor), quartz, biotite, aegirine-augite, riebeckite, titanite, apatite, zircon, fluorite, epidote, calcite, sericite, kaolin and muscovite and limonite.
There were also good smoky quartz crystals up to 20 cm, microperthite crystals, and some nice stilbite specimens.