Formula SiO2
Crystal Growth
Growth Method hydrothermal
Max. Diameter (mm) 100 x 100
Crystallographic Properties
Crystal Structure
Lattice Constant (nm)
trigonal
a= 0.49124
c= 0.54039
Color colorless
Physical Properties
Density (g/cm3) 2.65
Melting Point (K) 1973
Thermal Conductivity (W • m-1K-1) 10.7 ǁ c, 6.2 ⊥ c (at 323 K)
Thermal Expansion (10-6K-1) a11 = 13.71, a33 = 7.48
Dielectric Constant 4.34 ǁ c, 4.27 ⊥ c (at 30 MHz)
Elastic Coefficients c11=87 c12=7 c44=58 c13=13 c14=(-)18 c33=106
Specific Heat Capacity (J •kg-1K ) 710
Hardness (Mohs) 7