Gneiss is a type of metamorphic rock with a striped appearance due to layers of light and dark minerals. In this case, biotite, sometimes called black mica, is the dark mineral.

Morton gneiss (pronounced “nice”), named for the town in Renville County where it has been quarried, is one of the oldest stones on the planet: about 3.5 billion years old.

The gneiss, located on the top of the mountain, consists of mainly a biotite-quartz-feldspar gneiss interlayered with minor amphibolite gneiss and feldspar augen gneiss. Over a kilometer of land ...

Huanggang Dabieshan Geopark is located in Hubei Province, in eastern China. It demonstrates the geological evolution of the region, notably the collision between the tectonic plates of North China and ...

Dr Bera’s research highlights how north Sikkim’s terrain—composed of high-grade metamorphic rocks such as phyllite, mica schist, and biotite gneiss—is particularly prone to landslides ...

Greenvale Energy is awaiting permitting and approvals to start maiden uranium drilling at its Oasis project in Queensland. ..

Partial melting of subducted continental crust at ultra-high pressure (UHP) conditions may facilitate the exhumation of large UHP terranes like the Western Gneiss Region (WGR), Norway. During the ...