ROCKBANR.GIF (45562 bytes)

Gneiss Rocks


GNEISS.JPG (16877 bytes)

Gneiss rocks are metamorphic. These rocks may have been granite, which is an igneous rock, but heat and pressure changed it. You can see how the mineral grains in the rock were flattened through tremendous heat and pressure and are arranged in alternating patterns.

See how metamorphic rocks are formed at
Metamorphic Animation page.


backHARDHAT.GIF (3856 bytes)next

||| Kinds of Rocks ||| Rock Home Page ||| Expert Quiz |||