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1957年在阿根廷发现。物理性质矿物颗粒极细,只有在电子显微镜下才能分辨出板状集合体(图103)。具解理。加热后颜色呈赭黄色。比重介于2.89—3.32之间,计算比重为3.32。在紫外光照射下发弱的黄绿色荧光(硅钙铀矿型)。未精细测定光性
Found in Argentina in 1957. Physical properties Mineral particles are very fine, and plate-shaped aggregates can be discerned only under an electron microscope (Figure 103). With cleavage. After heating the color was ocher yellow. Proportion of 2.89-3.32 between the calculated proportion of 3.32. Under the ultraviolet light weak yellowish green fluorescence (calcium-calcium uranium type). Lightness is not measured finely