对四价铀矿物(特别是沥青铀矿)结晶化学特性的研究表明,矿物的不稳定性是由氧化、自氧化、水化作用以及其它往往相互迭加的一些作用造成的。由于这些原因,矿物成分中出现了能使结构变形和物理性质(包括光学性质)改变的六价铀。首先发现了沥青铀矿的反射强度和显微硬度与按含氧系数而确定的氧化状态之间的相互关系。随着氧化程度(含氧系数)的增高,反射强度和显微硬度随即减小。除了这个一般性的规律外,还发现有这样的样品:其反射强度高,但显微硬度低,或反射强度低,而显微硬度高。这些偏离一般规律的原因尚未查明。在分析某些矿床有代表性的沥青铀矿样品(共100多个)时,对反射强度和显微硬度进 Studies of the crystallization chemistry of tetravalent uranium minerals, especially uraninite, have shown that the instability of minerals is caused by the effects of oxidation, autoxidation, hydration, and other interactions that tend to be superimposed on each other. For these reasons, hexavalent uranium has been found in mineral compositions that can change the structure and physical properties (including optical properties). First, the correlation between the reflection intensity and microhardness of asphaltic uranium ore and the oxidation state determined by the oxygen content coefficient was found. With the oxidation degree (oxygen content) increases, the reflection intensity and microhardness then decreases. In addition to this general rule, there is also found a sample that has a high reflection intensity but a low microhardness or a low reflection intensity and a high microhardness. The reasons for these deviations from the general law have not yet been identified. In the analysis of representative samples of some uranium deposits (more than 100 in total) in some deposits, the reflection intensity and microhardness