noun
definition
Any of a group of crystalline minerals containing silicates of iron, magnesium and calcium.
Examples of pyroxenes in a Sentence
Again, the pyroxenes, RS103 (R=Fe, Mg, Mn, &c.), assume the forms (I) monoclinic, sometimes twinned so as to become pseudo-rhombic; (2) rhombic, resulting from the pseudo-rhombic structure of (I) becoming ultramicroscopic; and (3) triclinic, distinctly different from (I) and (2); (I) and (2) are polysymmetric modifications, while (3) and the pair (I) and (2) are polymorphs.
The pyroxenes may be pale green diopside, dark green aegirine-augite, or blackish green aegirine (soda iron pyroxene), and in many cases are complex, the outer portions being aegirine while the centre is diopside.
We are particularly interested in the sources of basaltic rocks and greenstones, including serpentine, nephrites and sodic pyroxenes (jades ).
We are particularly interested in the sources of basaltic rocks and greenstones, including serpentine, nephrites and sodic pyroxenes (jades).