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Mg2(Al4Si5O18) A blue, orthorhombic magnesium aluminosilicate mineral frequently occurring associated with thermally metamorphosed rocks derived from argillaceous sediments.



[named for French geologist P. Cordier (1777–1861)], also iolite or dichroite, a mineral, a complex aluminosilicate of aluminum, magnesium, and iron; chemical composition, (Mg, Fe)2Al3[AlSi5O18]. Its crystal structure is characterized by a ring construction similar to that of beryllium. Cordierite crystallizes in the orthorhombic system. It occurs in the form of prismatic crystals, irregular clusters, and grains of blue-gray, blue, violet, or brown color; sometimes it is colorless. It has a hardness of 7.0–7.5 on the mineralogical scale and a density of 2,600–2,660 kg/m3. Dichroism is a characteristic feature and is highly pronounced in transparent grains. The mineral effloresces easily to form talc, mica, and other secondary minerals. Cordierite is formed during contact metamorphosis of rocks rich in aluminum and magnesium. Transparent varieties of cordierite are used as gems.

References in periodicals archive ?
Improved Lifetime Pressure Drop Management for Robust Cordierite (RC) Filters with Asymmetric Cell Technology (ACT)," SAE Technical Paper 2007-01-0920, 2007, doi:10.
Other topics include VOC decomposition by photocatalytic wall paper, net-shape forming of TiAl automotive parts for fuel efficiency, low-temperature synthesis of porous cordierite from fly ash, and cathode materials for lithium ion batteries.
Cordierite also has a low coefficient of expansion, a high working temperature, and low conductivity.
From 2009 onward, the joint venture partners plan to manufacture high performance and cost-effective diesel particulate filters made of cordierite and to market them separately.
1996) and (1997) synthesized cordierite and mullite particles, respectively, using ultrasonic atomization.
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.
which also produces ceramic substrates, supplies cordierite DPFs to Toyota Motor and Hino Motor for their DPNR system which is available on the Avensis car and Dutro truck.
These metamorphic rocks are made of minerals such as micas, garnet, kyanite, sillimanite and cordierite.