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%ما هو (من)٪ 1 - تعريف
SILICA MINERAL, POLYMORPH OF QUARTZ
Crystobalite
![O]]4 tetrahedra. There is a right-handed four-fold screw axis at the centre of half the white squares, and a left-handed one at the centre of the others. In this projection we see glide planes parallel to the axes and mirrors on the diagonals. In reality the tetrahedra are constantly wobbling.](https://commons.wikimedia.org/wiki/Special:FilePath/B-cristobal1.png?width=200 "O]]4 tetrahedra. There is a right-handed four-fold screw axis at the centre of half the white squares, and a left-handed one at the centre of the others. In this projection we see glide planes parallel to the axes and mirrors on the diagonals. In reality the tetrahedra are constantly wobbling.")
cristobalite
[kr?'st??b?l??t]
¦ noun a form of silica which is the main component of opal.
Origin
C19: named after Cerro San Cristobal in Mexico, where it was discovered.
ويكيبيديا
Cristobalite
Cristobalite is a mineral polymorph of silica that is formed at very high temperatures. It has the same chemical formula as quartz, SiO2, but a distinct crystal structure. Both quartz and cristobalite are polymorphs with all the members of the quartz group, which also include coesite, tridymite and stishovite. It is named after Cerro San Cristóbal in Pachuca Municipality, Hidalgo, Mexico.
It is used in dentistry as a component of alginate impression materials as well as for making models of teeth.
