Assertion: cordierite | /r/HasProperty | a crystalline mineral
Facets:
Source sentences:
text: Cordierite is a crystalline mineral that is desired for its physical properties, especially its relatively low rate of thermal expansion.
text: Cordierite is a crystalline material demonstrating relatively high refractoriness, having a melting point of about 1460°C., and, in a pure form, exhibits excellent electrical insulating properties and a relatively low coefficient of thermal expansion over the range up to 1000°C., viz., about 16 × 10-7 /°C.