Chemical and Physical Properties:

Color (Powder): White

Crystal: Transparent

Crystal Parameters (Tetragonal): a = 6.60Ά, c = 5.88Ά

Density: 4.60 gm/cc

Dielectric Constant: 12.7

Entropy: 20.1 Kg Cal/Mole @ 298.16 K

Hardness (Mohs): 7.5

Melting Point: 1538 ^oC - 1677 ^oC (decomposes)

Molecular Weight: 183.1

Reflectance:   Infrared:      60 - 75%

                    Ultraviolet:      80 - 85%

Refractive Index: 2.00

Solubility: Insoluble in: H₂O, dilute acids, cold dilute alkali solutions and hot concentrated H₂SO₄. Soluble in: HF (slightly) and hot concentrated alkali solutions.

Specific Heat: 25.53 Cal/^oC/Mole

Thermal Conductivity at 100 ^oC: a = AXIS 0.0101, c = AXIS 0.0097 (Cal/Sec/cm/cm²/^oC)

Thermal Expansion: 4.2 x 10^-7 in/in/^oF, 7.6 x 10^-7 cm/cm/^oC