Five different types of amygdaloid complexes were found in vesicular basalt of Puge County, south Sichuan, mainly calcite amygdaloid complex and asphalt (bitumen) amygdaloid complex. The babingtonite amygdaloid complexes are spheroidal with 5～8 mm in diameter. A commonly recognized mineral sequence of the amygdaloid complex from the wall inward is quartz→brunsvigite→babingtonite. The babingtonite crystals are black and lamellar, and are composed of five pinacoids. X-ray micro-diffraction measurements indicate that babingtonite is triclinic, with space group P. Chemical composition analyses show that babingtonite has the following data: SiO₂ 53.55%, CaO 18.84%, Fe₂O₃ 13.65%, FeO 9.68%, MgO 1.44%, H₂O⁺ 1.74%, and FeO/Fe₂O₃=0.709, whereas brunsvigite has the data SiO₂ 33.17%, Al₂O₃ 13.03%, Fe₂O₃ 8.45%, FeO 13.06%, MgO 18.82%, H₂O⁺ 12.12%, CaO 0.87%,and FeO/ Fe₂O₃=1.55. The evolution of mineral associations in babingtonite amygdaloid complexes suggests that the ore-forming fluids at the late stage converted from Mg- and Fe-rich fluids to Si- and Ca-rich fluids. Babingtonite crystallized in a transitional environment from meta-acid and weak reduction to meta-alkaline and weak oxidation.