Orthocuproplatinum, Pt3Cu, is a new mineral from the Lubero region of North Kivu, Democratic Republic of the Congo. The mineral, which has a synthetic analogue, occurs as a 1.5-mm-long alluvial grain in a heavy-mineral concentrate, together with the holotype specimen of kitagohaite, Pt7Cu. The grain of orthocuproplatinum has a rim of hongshiite, PtCu, and abundant inclusions of calcite. Opaque and metallic, orthocuproplatinum has a whitish colour in reflected light and slightly perceptible anisotropy. The crystal structure of orthocuproplatinum is orthorhombic, space group Cmmm. Its unit-cell parameters: a = 7.681(1) Å; b = 5.4318(8) Å; c = 2.7502(4) Å; V = 114.74(3) Å3; Z = 2. The calculated density is 17.866 g cm−3. The strongest diffraction lines are [d in Å(I)]: 2.337 (11), 2.236 (100), 2.217 (97), 1.932 (61), 1.920 (30), 1.362 (36), 1.169 (24), 1.161 (23). The Vickers hardness is 243 kg mm−2 (VHN25), corresponding to a Mohs hardness of 4. The empirical formula of orthocuproplatinum, calculated from a mean value of 12 electron-probe microanalyses that gave 12.9 wt% Cu and 87.3 wt% Pt, is Pt2.76Cu1.24 on the basis of 4 atoms.

中文翻译：

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Orthocuproplatinum, Pt3Cu，一种来自刚果民主共和国北基伍省 Lubero 地区的新矿物

Orthocuproplatinum Pt3Cu 是一种来自刚果民主共和国北基伍省 Lubero 地区的新矿物。这种具有合成类似物的矿物在重矿物精矿中以 1.5 毫米长的冲积颗粒的形式出现，与北海石的正模标本 Pt7Cu 一起出现。正铜铂的颗粒边缘有红石矿、PtCu 和丰富的方解石包裹体。不透明的金属正铜铂在反射光下呈白色，并具有轻微的各向异性。正铜铂的晶体结构为斜方晶系，空间群为Cmmm。其晶胞参数：a = 7.681(1) Å；b = 5.4318(8) Å；c = 2.7502(4) Å；V = 114.74(3) Å3；Z = 2。计算的密度为 17.866 g cm−3。最强的衍射线是 [d in Å(I)]: 2.337 (11), 2.236 (100), 2.217 (97), 1.932 (61), 1.920 (30), 1.362 (36), 1。169 (24), 1.161 (23)。维氏硬度为 243 kg mm-2 (VHN25)，对应于 4 的莫氏硬度。 正铜铂的经验公式，根据 12 次电子探针显微分析的平均值计算得出，其中含有 12.9 wt% 的 Cu 和 87.3 wt% 的 Pt，基于4个原子是Pt2.76Cu1.24。