The new mineral uranoclite (IMA2020-074), (UO2)2(OH)2Cl2(H2O)4, was found in the Blue Lizard mine, San Juan County, Utah, USA, where it occurs as tightly intergrown aggregates of irregular yellow crystals in a secondary assemblage with gypsum. The streak is very pale yellow and the fluorescence is bright green–white under 405 nm ultraviolet light. Crystals are translucent with vitreous lustre. The tenacity is brittle, the Mohs hardness is ~1½, the fracture is irregular. The mineral is soluble in H2O and has a calculated density of 4.038 g⋅cm–3. Electron microprobe analyses provided (UO2)2(OH)2.19Cl1.81(H2O)4. The six strongest powder X-ray diffraction lines are [dobs Å(I)(hkl)]: 8.85(38)(002), 5.340(100)(200, 110), 5.051(63)($\bar{2}$02), 4.421(83)(112, 004, 202), 3.781(38)($\bar{2}$12) and 3.586(57)(014, $\bar{2}$04). Uranoclite is monoclinic, P21/n, a = 10.763(8), b = 6.156(8), c = 17.798(8) Å, β = 95.656(15)°, V = 1173.5(18) Å3 and Z = 4. The structure is the same as that of synthetic (UO2)2(OH)2Cl2(H2O)4 in which the structural unit is a dimer consisting of two pentagonal bipyramids that share an equatorial OH–OH edge. The dimers are linked to one another only by hydrogen bonding. This is the second known uranyl mineral containing essential Cl and the first in which Cl coordinates to U6+.

在美国犹他州圣胡安县的 Blue Lizard 矿中发现了新矿物铀晶石 (IMA2020-074), (UO 2 ) 2 (OH) 2 Cl 2 (H 2 O) 4不规则黄色晶体与石膏二次组合的聚集体。条纹呈淡黄色，荧光在 405 nm 紫外光下呈亮绿色-白色。晶体呈半透明状，有玻璃光泽。韧性较脆，莫氏硬度~1½，断口不规则。该矿物可溶于 H 2 O，计算密度为 4.038 g⋅cm –3。提供电子微探针分析 (UO 2 ) 2(OH) 2.19 Cl 1.81 (H 2 O) 4。6 条最强的粉末 X 射线衍射线是 [ d obs Å( I )( hkl )]: 8.85(38)(002), 5.340(100)(200, 110), 5.051(63)( $\bar{2 }$ 02), 4.421(83)(112, 004, 202), 3.781(38)( $\bar{2}$ 12) 和 3.586(57)(014, $\bar{2}$ 04)。Uranoclite 是单斜的, P 2 1 / n , a = 10.763(8), b = 6.156(8), c = 17.798(8) Å, β = 95.656(15)°, V = 1173.5(18) Å 3和Z = 4. 结构与合成 (UO 2 ) 2 (OH) 2 Cl 2 (H 2 O) 4的结构相同，其中结构单元是由两个共享赤道 OH-OH 的五角双锥体组成的二聚体边缘。二聚体仅通过氢键相互连接。这是第二种已知的含有必需 Cl 的铀酰矿物，也是第一种其中 Cl 与 U 6+配位的矿物。