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A dark blue mineral occurring chiefly in metamorphic rocks. It consists of an aluminosilicate of magnesium and iron, and also occurs as a dichroic gem variety.
‘Sericite is fine-grained muscovite formed by alteration of such minerals as feldspar, cordierite, and sillimanite.’
‘Magnetite, because of its magnetism, and cordierite, because of its dichroism, were used in ancient times for navigational purposes.’
‘Some gray to dark gray cordierite also exhibits excellent transparency.’
‘Monazite clusters occur in a variety of host minerals, including cordierite, quartz, biotite and andalusite.’
‘The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum.’
‘This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.’
‘While admitting that cordierite has low heat resistance when compared to silicon carbide, he feels that the material's limitations are offset by the total system’s approach.’
‘In 1995 field reconnaissance in the central Laramie Range of southeastern Wyoming led to the discovery of a new source of gem- and near-gem-quality cordierite and corundum.’
‘The presence of detrital cordierite in soil 300 feet up-slope from the outcrop suggests that the deposit may have a minimum strike length of 500 feet.’
‘The DPF is made of a cordierite ceramic which lowers the material costs and is also easy to manufacture.’
‘In addition, poor-quality, translucent to cloudy, dark gray cordierite is also present, as is corundum with well-developed rhombohedral parting that tends to crumble.’
‘Although biotite is capable of this, other minerals such as muscovite, garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.’
‘Sillimanite, cordierite, apatite, monazite and zircon are also present.’
‘The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation.’
Origin
Early 19th century: named after Pierre L. A. Cordier (1777–1861), French geologist, + -ite.