Calcium oxalate hydrate is a key compound in medical and biological research. It is a primary component of kidney stones, aiding studies on crystallization processes and the development of treatments to prevent urolithiasis. In botany, it is used to examine plant defense mechanisms, as many plants form calcium oxalate crystals to deter herbivores and pathogens. In analytical chemistry, it serves as a precipitating agent for the gravimetric determination of calcium ions. It is not commonly used as a catalyst or flux in industrial synthesis due to its insolubility and stability.