A glassy,usually yellowish gray variety of orthorhombic pyroxene having a magnesium silicate base,mainly MgSiO3,usually found embedded in igneous rocks and meteorites.

• 顽火辉石一种象玻璃似的，常为淡褐灰色的正方晶辉岩，具有一个镁硅酸盐基，主要为硅酸镁MgSiO3，通常可在火成岩及陨石中发现。