1979年夏,我们在弓长岭铁矿发现了大量磁铁矿双晶及少见的磁铁矿板状晶体,产于被古断裂切割的富矿围岩绿泥岩、石榴绿泥岩、铁闪绿泥岩中。双晶属尖晶石律的粒状双晶、三晶、板状对称和不对称双晶,单晶的形态也有各种各样,粒状、板状不一。最大的晶体可达3.5×3.2×2厘米。在这些单晶和双晶上,往往迭加有聚片双晶和蚀象,组成了罕见的磁铁矿晶体群。 In the summer of 1979, we found a large number of magnetite twin crystals and rare magnetite plate crystals in the Gongchangling Iron Mine, which were produced in the paleo-fractured cuttings of the porphyry-greenstone, pomegranate-green mudstone, iron-flash greenstone in. Gemini spinel law granular twin, three crystal, plate symmetry and asymmetric twin, single crystal morphology is also varied, granular, plate-shaped. The largest crystal up to 3.5 × 3.2 × 2 cm. In these single crystal and double crystal, often superimposed with polycrystalline twin crystal and eclipse, formed a rare group of magnetite crystals.