Non orthotropic anisotropy #566
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This PR modifies the functions in$\boldsymbol{\beta}_T \neq \partial \ln(\boldsymbol{F}) / \partial P|T$ , and instead $\boldsymbol{\beta}_T = 0.5( \boldsymbol{L}_P + \boldsymbol{L}^T_P)$ , where $\boldsymbol{L}_P = (\partial \boldsymbol{F} / \partial P|T) \boldsymbol{F}^{-1}$ .
AnisotropicMineralfor non-orthotropic materials. Specifically, in non-orthotropic materials, changes in the eigenvectors of deformation mean that the second order compressibility tensorThis has a negligible effect on even non-orthotropic equations of state, but for the avoidance of confusion the correct expressions are implemented here.