Talk:Cristobalite

In my opinion, cristobalite is not a "Quartz variety", since quartz refers to a particular crystalline form of silica. The connectivity of tetrahedra in the quartz framework is rather different from that in quartz. It would be better to label it as a "Silica variety", which refers only to chemistry and not structure. This should probably be changed in the original listing "Quartz variety". At the moment I have not changed anything--Octopodes 04:57, 7 January 2007 (UTC)

Cristobalite Needles
in 2020 I wrote: https://www.mindat.org/article.php/3875/B-Cristobalite+Needles

https://www.sciencedirect.com/science/article/pii/0272884295909093?via%3Dihub

“the evidence shows that the cristobalite seed could induce a compressive stress due to the abrupt volume increase as cristobalite transformed from α phase to β phase at elevated temperature. From the kinetic analysis, the time exponent, n, decreases with increasing cristobalite seed additions, s'''uggesting that the transformation kinetics is controlled by a long-range diffusion mechanism from a two-dimensional plate-like growth to a one dimensional needle-like growth. '''The activation energy calculation shows that the nucleation and growth process of cristobalite crystals is not similar to the incubation process of cristobalite nucleation in the solid-state reaction of fused silica-cristobalite.”

The subject remains ignored.

Dave Crosby DaveC1 (talk) 06:29, 6 February 2023 (UTC)