nephelinite

• Substantif désignant une roche magmatique volcanique composée principalement de néphéline et de pyroxène.

A noun referring to a type of igneous rock composed primarily of nepheline and pyroxene.

1. Igneous rockC2formalscientific

   A dark, fine-grained volcanic rock composed primarily of nepheline and pyroxene, often found in alkaline volcanic regions.

   Néphélinite

   • The geologist identified the sample as nephelinite due to its high nepheline content.
   • Nephelinite lava flows are common in the East African Rift.
   • The mineral composition of nephelinite distinguishes it from basalt.