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Powder samples of natural lawsonite (Ca-lawsonite, ) was studied structurally up to 8 GPa at room temperature using monochromatic synchrotron X-ray powder diffraction and a diamond anvil cell (DAC) with a methanol : ethanol : water (16 : 3 : 1 by volume) mixture solution as a penetrating pressure transmitting medium (PTM). Upon pressure increase, lawsonite does not show any apparent pressure induced expansion (PIE) or phase transition. Pressure-volume data were fitted to a second-order Birch-Murnaghan equation of state using a fixed pressure derivative of 4 leading to a bulk modulus () of 146(6) GPa. This compression is further characterized to be isotropic with calculated linear compressibilities of ${\beta}^a

Isotropic Compression Behavior of Lawsonite Under High-pressure Conditions