The existence of residual mica flakes/particles up to 30% in the parent soil makes it highly vulnerable to geotechnical engineering constructions due to low compactibility, high resilience, low shear strength, and high compressibility, along with larger susceptibility to breakage under repeated loading. This leads to the wastage of considerable resources, especially if the mica content is greater than 10%, which can be otherwise used as a fill material for embankments, pavements, retaining walls, and other civil engineering structures. The presence of flaky mica particles alters the mechanical behavior of sand through micro-level particle arrangements caused by bridging, ordering, and pore-filling phenomena. So, an appropriate stabilization technique that could sustainably improve the geotechnical characteristics of micaceous sand is the need of the hour. This present study focuses on the usage of Xanthan Gum biopolymer as a stabilizer in improving the shear strength and compressibility behavior of micaceous sand with 30% mica. A series of direct shear tests and 1D Oedometer tests were conducted on micaceous sand stabilized with 0, 0.5, 1 and 1.5% Xanthan Gum, which was subjected to varying curing periods of 1, 3, and 7 days to understand the variations in the shear strength and compressibility properties. A steady increase in the shear strength of micaceous sand was observed with an increase in the percentage of xanthan gum as well as with the increase in the curing period. Similarly, the compressibility index was considerably reduced with an increase in xanthan gum content and curing period. SEM analyses of the treated micaceous sand specimen with varying percentages of xanthan gum were done to comprehend the microscopic mechanism behind the improved strength and compressibility. The adhesion among the Xanthan Gum-Sand-Mica matrix majorly contributed toward the improvement in the shear strength and compressibility characteristics of stabilized micaceous sand.