Figure 1. Tetrahedral configuration of Silica

From

Dental Ceramics: Part I – An Overview of Composition, Structure and Properties

P. Jithendra Babu, Rama Krishna Alla, Venkata Ramaraju Alluri, Srinivasa Raju Datla, Anusha Konakanchi

American Journal of Materials Engineering and Technology. 2015, 3(1), 13-18 doi:10.12691/materials-3-1-3