Andalusite, and rarely cordierite
, porphyroblasts (Fig.
Compared to DPFs made of other materials, cordierite
DPFs are light and provide lower pressure drop of exhaust gas resulting in high engine performance and efficient purification.
Uskokovic, "Synthesis and Formation Mechanism of Submicrometer Spherical Cordierite
Powders by Ultrasonic Spray Pyrolysis," J.
The astronauts collected their samples near the moon's huge Imbrium basin, and the researchers suggest the cordierite
bit was "excavated" by the same impact that formed Imbrium.
However, scattered lenses of pale metasiltstone show a smaller proportion of cordierite
porphyroblasts than their matrix, and contain visible laminae of pale metasiltstone that are folded in open to tight folds (Figs.
Typical high temperature non magnetic minerals found in pyrometamorphic rocks associated with coal combustion appear to include several Fe and Al rich clinopyroxene, melilita, cristobalite, tridymite, mullite, cordierite
and fayalite solid solutions, as well as glass (Foit et al.
The Southwestern Group consists of cordierite
granulite facies rocks made of cordierite
gneisses, calc granulites, and metasediments.
The main rock types of the zone are Al-rich gneisses (with biotite, cordierite
, garnet, and sillimanite) and biotite-plagioclase gneisses; less abundant are amphibole gneisses, amphibolites, and quartz-feldspar gneisses.
The metamorphosed alteration zones are characterized by the presence of various combinations of anthophyllite, cordierite
, garnet, staurolite, biotite and/ or andalusite.
Geothermobarometry of the Bi + Gr [+ or -] Sil assemblage and cordierite
suggests peak metamorphic conditions at 600-700[degrees]C and 3-5 kbar (Klein 1986; Koistinen et al.
Talc products are also being extensively used in vehicles for manufacturing and processing cordierite
bodies for catalytic converters.
K-feldspar is stable, muscovite is present only as a retrograde mineral, garnet is very rare, and cordierite
occurs in both mesosome and leucosome.