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在挪威某些正岩浆铜镍矿床的矿石中，六万磁黄铁矿基质内的单斜磁黄铁矿叶片是高温时形成的磁黄铁矿固溶体在降温过程中出溶的产物。出溶叶片宽度和间距的加大、叶片的带状分布、楔形尖端、箱状扭曲和复杂叶片等结构，表明出溶产物在不高于单斜-六方转变温度（254℃）的条件下发生过显著的退火和粗化。重结晶的六方磁黄铁矿基质中所保存的单斜变种甚少，表明变质作用所引起的矿石重结晶，可使磁黄铁矿吸收其中的单斜出溶体而发生均匀化。
In some of the ore from the positive magmatic copper-nickel deposits in Norway, monoclinic pyrrhotite leaves within the 60,000 pyrrhotite matrix are the products of the pyrrhotite solid solution formed during the cooling process at high temperatures. The increase in the width and spacing of the leaves, the zonal distribution of the leaves, the wedge-shaped tips, the box-like twists and the complex leaf structures indicated that the dissolved products occurred at a temperature no higher than the monoclinic-hexagonal transition temperature (254 ° C) Significant annealing and coarsening. The recrystallized hexagonal pyrrhotite matrix retained little monoclinic alteration, indicating that the recrystallization of the ore caused by metamorphism can make the pyrrhotite absorb the monoclinic solution and homogenize.