Norite

Norite among the hard rocks. You have granite-like properties. Since these stones missing quartz, however, they are not as wear resistant as the granites. It often is dark rock varieties. They are popular along with other dark plutonic rocks such as gabbro in natural stone trade, also known as " Black Granite ".

As Norite be in the Petrography rocks from 10-90 % orthopyroxene ( enstatite, bronzite, hypersthene ) and 10-90% of basic plagioclase ( labradorite / Bytownite according to the old classification ) called with less than 5% clinopyroxene ( augite ), olivine or quartz (35% -65 % mafic components). Accessory minerals are, eg, ilmenite, magnetite and pyrrhotite. The corresponding rock 10-90 % olivine instead of orthopyroxene is a Troktolith.

"As Norite Gabbrogesteine ​​are designated by specific Pyroxenmineralen, it outweigh the orthopyroxenes against the clinopyroxenes no difference in the technical and optical properties is the normal gabbros. . "

• Impala ( Other name for Impala are: Nero Africa, Rustenburg, Black Africa )

Importance as a raw material carrier

Norite can be used as liquid magmatic excretion finely distributed (disseminated ) contain sulfides such as pyrrhotite ( magnetic pyrites ), pentlandite ( nickel pyrrhotite ) and chalcopyrite ( copper pyrites ). With sufficient nickel contents and corresponding inventories is then a nickel and copper ore from the rock. Examples in Europe: Lainejaur in Skelleftefeld in Sweden, and Eptevann Flat in Norway. Examples in Canada: Sudbury, Ontario, Voiseau Bay in Labrador.

Swell

• Plutonic rocks
• Plutonic natural stone