川西义敦某地发现罕见的斧石矿床 ,产于黑云母二长花岗岩与中下三叠统图姆沟组外接触带的矽卡岩中 ,为中高温、中温热液接触交代形成。其形成时代为早第三纪。矿物呈紫色 ,透明至半透明 ,据化学成份确定为锰铁斧石。其晶粒粗大 ,颜色鲜艳夺目 ,无裂纹 ,可作为中高档宝石原料 ,具有较高的经济价值。 A rare axstone deposit was discovered in Yidun, western Sichuan, and was produced in the skarn of the outer contact zone of biotite monzogranite and the Middle-Lower Triassic Tumgou Formation, and was formed by medium-high temperature and intermediate-temperature hydrothermal contact. The formation of the era as early Tertiary. Minerals were purple, transparent to translucent, according to the chemical composition identified as manganese iron ax. Its coarse grains, colorful and eye-catching colors, no cracks, can be used as high-grade gem raw materials, with high economic value.