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