Our stilbite-Ca specimens were collected at basalt quarries in the Jalgaon District in the state of Maharashtra in the Republic of India. Jalgaon is located within the Deccan Traps, a huge volcanic province that formed some 65 million years ago and consists of basalt formations as thick as 6,000 feet. Our specimens were extracted from vesicles that formed from gas bubbles in the original magma. Later, these cavities filled with mineral-rich groundwater that precipitated crystals of quartz, calcite, and various zeolite minerals. Basalt quarrying is an important industry throughout the Deccan Traps region of India. Crushed basalt is used as ballast and fill for roads, rail beds, foundations for buildings and dams, and cement additives. Our stilbite-Ca specimens were recovered by professional specimen miners who contract with quarry managers for permission to extract zeolite specimens when they are exposed by quarrying operations