Sinhala Dictionary definitions for gneiss
gneiss 🔊 /najˈs/
gneiss : නයිස් පාෂාණ
gneiss : කළු ගල්
gneiss : කළුගල් වර්ගයක්
gneiss definition
Noun. A crystalline rock, consisting, like granite, of quartz, feldspar, and mica, but having these materials, especially the mica, arranged in planes, so that it breaks rather easily into coarse slabs or flags. Hornblende sometimes takes the place of the mica, and it is then called hornblendic / syenitic gneiss. Similar varieties of related rocks are also called gneiss.