One of the mysteries of the English language finally explained.
A dark blue mineral occurring chiefly in metamorphic rocks. It consists of an aluminosilicate of magnesium, and also occurs as a dichroic gem variety.
- ‘Monazite clusters occur in a variety of host minerals, including cordierite, quartz, biotite and andalusite.’
- ‘Although biotite is capable of this, other minerals such as muscovite, garnet and cordierite are more efficient and preferentially occur in strongly peraluminous rocks.’
- ‘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.’
- ‘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.’
- ‘The grayish-blue, partly gemmy cordierite, when first discovered in the early twentieth century, was mistakenly reported as corundum.’
- ‘Sillimanite, cordierite, apatite, monazite and zircon are also present.’
- ‘Magnetite, because of its magnetism, and cordierite, because of its dichroism, were used in ancient times for navigational purposes.’
- ‘The DPF is made of a cordierite ceramic which lowers the material costs and is also easy to manufacture.’
- ‘Some gray to dark gray cordierite also exhibits excellent transparency.’
- ‘Sericite is fine-grained muscovite formed by alteration of such minerals as feldspar, cordierite, and sillimanite.’
- ‘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.’
- ‘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.’
- ‘The spotted textures are marked by the growth of biotite, cordierite and andalusite on the metamorphic foliation.’
- ‘This granulite consists of garnet, biotite, muscovite, quartz, plagioclase and cordierite.’
Early 19th century: named after Pierre L. A. Cordier (1777–1861), French geologist, + -ite.
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