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1972年公布研究资料,在法国上维埃纳省昂巴扎克山铀矿区西南端的马尔尼亚克矿床发现。物理性质呈小的晶体(长达1 mm),横切面为假六边形(图7左)。沿{100}连生,平行于{010}略成扁平状,平行于{001}延长。观测到的单形为:{010)、{100}、{001)及{110}。测得面角(100):(001)=58°40′,(010):(110)=49°50′。平行于{010}的解理完好。颜色为橙色。测定比重5.60,计算值为
Research data were released in 1972 and were found in the Marignac deposit on the southwestern tip of the Umbaxac Hill uranium deposit in the province of Vienne in France. Physical properties of small crystals (up to 1 mm), cross-section of a fake hexagon (Figure 7 left). Stratified along {100}, slightly flattened parallel to {010}, lengthened parallel to {001}. The observed simplex shapes are: {010}, {100}, {001} and {110}. The measured face angle (100): (001) = 58 ° 40 ’, (010) :( 110) = 49 ° 50’. Cleave parallel to {010} intact. The color is orange. Determination of the proportion of 5.60, calculated as