GeologyRocksPyroxene
Thu, 01/18/2007 - 19:26 — Jon
Silicate mineral composed of chains of silica tetrahedra. Cations occupy the sites between oxygen atoms. The general formula is:
A1-x(B,C)1-xT2O6.
A is commonly sodium or calcium, B is magnesium or iron (2+), C is aluminium or iron (3+) and T is silicon or aluminium. It is common in igneous and metamorphic rocks.