云龙锡矿锡石的标型特征

云龙锡石的晶形以双锥集合体、双锥柱状为主,结晶晶形好。锡石的颜色本质上为棕色,由于锡石中棕色条带所占比例的不同而构成了各种颜色。锡石的磁性为亚铁磁性及抗磁性两种。其形成温度以高温为主,至少有三个世代。锡石的晶形、颜色,磁性及成矿温度均与化学成分关系密切,而化学成分及成矿温度又反映了矿床成因的特征。

TYPOMORPHIC CHARACTERISTICS OF CASSITERITE IN THE YUNLONG TIN DEPOSIT, YUNNAN PROVINCE

The crystal forms of cassiterite from the Yunlong tin deposit are well developed and represented by dipyramidal aggregates and dipyramidal-prismatic crystals. The cassiterite is brown in color. Its magnetic properties allow it to be classified as ferromagnetic and antimagnetic types. There are at least three generations of cassiterite with the hypothermal type being dominant. All these properties such as crystal form, color, magnetic properties and ore-forming temperature are closely related to the chemical composition of the cassiterite, while its chemical composition and ore-forming temperature reflect the genesis of the ore deposit.