(Boyle and Sladek (1975)).
| Bulk modulus | 5.63·1011 dyn cm-2 |
| Density | 5.614 g cm-3 |
| Hardness on the Mohs scale | 4.5 |
| Surface microhardness (using Knoop's pyramid test) | 450 kg mm-2 |
| Cleavage plane | {100} |
| Piezoelectric constant | e14= -0.13 C m-2 |
|
Temperature dependences of elastic constants. (Boyle and Sladek (1975)). |
| Bulk modulus (compressibility-1) | Bs= 5.62·1011dyn cm-2 |
| Shear modulus | C'= 2.4·1011dyn cm-2 |
| [100] Young's modulus | Yo= 6.31·1011dyn cm-2 |
| [100] Poisson ratio | σo = 0.31 |
| Wave propagation Direction | Wave character | Expression for wave speed | Wave speed (in units of 105 cm/s) |
| [100] | VL | (C11/ρ )1/2 | 3.97 |
| VT | (C44/ρ)1/2 | 2.77 | |
| [100] | Vl | [(C11+Cl2+2C44)/2ρ]1/2 | 4.38 |
| Vt|| | Vt||=VT=(C44/ρ)1/2 | 2.77 | |
| Vt⊥ | [(C11-C12)/2ρ]1/2 | 2.07 | |
| [111] | Vl' | [(C11+2C12+4C44)/3ρ]1/2 | 4.50 |
| Vt' | [(C11-C12+C44)/3ρ]1/2 | 2.33 |
| νLO(Γ15) | 6.87 | νTA(L3) | 1.37 |
| νTA(X5) | 1.70 | νLA(L1) | 4.60 |
| νLA(X3) | 4.99 | νLO(L1) | 6.15 |
| νTO(X5) | 6.36 | νTO(L3) | 6.48 |
| νLO(X1) | 6.35 |
|
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