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在西峡县羊乃沟,发现巨晶红柱石,最大的晶体块度为30×5×5公分,是迄今国内已发现红柱石矿晶体最大的产地之一。据少量红柱石样品分析、试验资料:A1_2O_3 51.19—60.35％,SiO_2 37.25—42.06％,Fe_2O_3 1.70一2.36％,TiO_2O.19一O.46％,耐火度1780一1790℃。由于红柱石晶体大,质量好,西峡县外贸局已组织出口,在一九八二年通过广交会外销30吨,一九八三年200吨。在国际市场,红柱石(南非,A1_2O_3 60％)到岸价90一130英镑/吨。红柱石产于震旦系中统小寨组(Z_(2x))的含铝泥质泥砂质变质岩系中,岩性主要
In Xiongxigou County of Xixia County, giant megalrin and rutile were found. The largest crystal block size is 30 × 5 × 5 cm. So far, one of the largest producers of andalusite crystals in China has been found so far. According to a small amount of andalusite sample analysis, the test data: 51.19-60.35% A1_2O_3, 37.25-42.06% SiO_2, Fe_2O_3 1.70 a 2.36%, TiO_2O.19 a 0.46%, refractoriness 1780-1790 ℃. Due to the large andalusite crystal and good quality, Xixia County Foreign Trade Bureau has organized the export. In 1982, it exported 30 tons and 200 tons in 1983 through the Canton Fair. In the international market, andalusite (South Africa, A1_2O_3 60%) CIF 90-130 pounds / ton. Andalusite produced in the Sinian Xiaozhaizi Formation (Z_ (2x)) aluminum-bearing muddy silt metamorphic rocks, the main lithology