Crystallographic
Syngony	Cubic
Symmetry Class	m3m
Lattice Constants	a = 5.640 Å c = a
Cleavability	(100), perfect

Optical
Refractive Index at ne	1.5467
Refractive Index at nF' - nC'	0.0132
Refractive Index at n10.6	1.4906
Refractive Index at n8.0 - n12.5	0.0308
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	(-3.31) ... (-3.73) x 10-5
Transmission Range, microns	0.2 - 20

Thermal
Thermal Linear Expansion, °C-1 for ±60 °C	(36.4 ... 40.8) x 10-6
Thermal Conductivity, W/(m * °C) at 35 °C	6.15
Specific Heat Capacity, J/(kg * °C)	0.871 x 103
Melting Point, °C	801

Mechanical
Density, g/cm3 at 20 °C	2.17
Mohs Hardness	3
Vickers Microhardness, Pa	20 x 107
Constants of Elastic Compliance, Pa-1	S11 = 22.85 x 10-12 S12 = -4.69 x 10-12 S44 = 78.34 x 10-12
Young Modulus (E), Pa
in <100> direction	4.37 x 1010
in <111> direction	3.27 x 1010
Shear Modulus (G), Pa
in <100> direction	1.59 x 1010
in <111> direction	1.28 x 1010
Poisson Ratio	0.203

Chemical
Molecular Weight	58.45
Solubility
in water, gram/100 cm3	35.7
in acids	soluble

Ref. Index vs. Wavelength l
Wavelength, Microns	Refractive Index
0.2	1.7899
0.5	1.5516
1.0	1.5320
2.0	1.5254
3.0	1.5242
4.0	1.5217
5.0	1.5185
6.0	1.5153
7.0	1.5112
8.0	1.5066
9.0	1.5009
10.0	1.4947
11.0	1.4878
12.0	1.4800
12.5	1.4758
15.0	1.4403
20.0	1.3822
30.0	1.0912

Internal Transmittance t i (l) vs. Wavelength l
Wavelength, Microns	Internal Transmittance
0.2	0.16
0.5	0.97
1.0	0.97
3.0	0.98
5.0	0.98
6.0	0.98
7.0	0.98
8.0	0.98
9.0	0.98
10.0	0.98
12.0	0.98
15.0	0.87
20.0	0.05

Custom sizes and specifications are available on request.