Crystallographic
Syngony	Cubic
Symmetry Class	m3m
Lattice Constants	a = 6.292 Å c = a
Cleavability	(100), perfect

Optical
Refractive Index at ne	1.4930
Refractive Index at nF' - nC'	0.0112
Refractive Index at n10.6	1.4546
Refractive Index at n8.0 - n12.5	0.0172
Thermal Coefficient of Refractive Index at 3.39 microns for ±60 °C	(-3.28 ... -3.75) x 10-5
Transmission Range, microns	0.21 - 21

Thermal
Thermal Linear Expansion, °C-1 for ±60 °C	(34.1 ... 38.3) x 10-6
Thermal Conductivity, W/(m * °C) at 46 °C	6.53
Specific Heat Capacity, J/(kg * °C)	0.695 x 103
Melting Point, °C	776

Mechanical
Density, g/cm3 at 20 °C	1.98
Mohs Hardness	2
Vickers Microhardness, Pa	15 x 107
Constants of Elastic Compliance, Pa-1	S11 = 26.21 x 10-12 S12 = -3.47 x 10-12 S44 = 161.98 x 10-12
Young Modulus (E), Pa
in <100> direction	3.82 x 1010
in <110> direction	1.68 x 1010
Shear Modulus (G), Pa
in <100> direction	1.08 x 1010
in <110> direction	0.63 x 1010
Poisson Ratio	0.134

Chemical
Molecular Weight	74.55
Solubility
in water, gram/100 cm3	34.7

Ref. Index vs. Wavelength l
Wavelength, Microns	Refractive Index
0.2	1.7170
0.5	1.4968
1.0	1.4796
2.0	1.4751
3.0	1.4735
4.0	1.4720
5.0	1.4703
6.0	1.4683
7.0	1.4659
8.0	1.4632
9.0	1.4601
10.0	1.4566
11.0	1.4527
12.0	1.4463
12.5	1.4460
15.0	1.4325
20.0	1.3947
30.0	1.2626

Internal Transmittance t i (l) vs. Wavelength l
Wavelength, Microns	Internal Transmittance
0.2	0.89
0.5	0.98
1.0	0.98
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	0.95
20.0	0.68

Custom sizes and specifications are available on request.