cristobalite

Etymology
Named for the type locality at Cerro San Cristóbal, Mexico,.

Noun

 * 1)  A mineral of volcanic rocks that solidified at a high temperature. Cristobalite is chemically identical to quartz, with the chemical formula SiO2, but has a different crystal structure. Crystals are always microscopic, and usually form small rounded masses.

Translations

 * Finnish: kristobaliiitti
 * Polish: krystobalit