The mechanical properties of fused quartz and silica are similar to other glasses. High tensile strength and high compressive strength are typical. Note that many properties are temperature-dependent and tensile strength is greatly affected by surface flaws.

Some of the major characteristics are:
Density: 2.203 g/cm3
Hardness: 5.3–6.5 (Mohs scale), 8.8 GPa
Tensile strenght: 48.3 MPa
Compressive strenght: >1.1 GPA
Bulk modulus: ~37 GPA
Rigidity modulus: 31 GPa
Young's modulus: 71.7 GPa
Poisson's ratio: 0.17
Lame elastic constant: λ=15.872 GPa, μ=31.261 GPA

Additional information on our quartz wafers:

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