The new mineral hrabákite (IMA2020-034) was found in siderite–sphalerite gangue with minor dolomite–ankerite at the dump of shaft No. 9, one of the mines in the abandoned Příbram uranium and base-metal district, central Bohemia, Czech Republic. Hrabákite is associated with Pb-rich tučekite, Hg-rich silver, stephanite, nickeline, millerite, gersdorffite, sphalerite and galena. The new mineral occurs as rare prismatic crystals up to 120 μm in size and allotriomorphic grains. Hrabákite is grey with a brownish tint. Mohs hardness is ca. 5–6; the calculated density is 6.37 g.cm–3. In reflected light, hrabákite is grey with a brown hue. Bireflectance is weak and pleochroism was not observed. Anisotropy under crossed polars is very weak (brownish tints) to absent. Internal reflections were not observed. Reflectance values of hrabákite in air (Rmin–Rmax, %) are: 39.6–42.5 at 470 nm, 45.0–47.5 at 546 nm, 46.9–49.2 at 589 nm and 48.9–51.2 at 650 nm). The empirical formula for hrabákite, based on electron-microprobe analyses (n = 11), is (Ni8.91Co0.09Fe0.03)9.03(Pb0.94Hg0.04)0.98(Sb0.91As0.08)0.99S7.99. The ideal formula is Ni9PbSbS8, which requires Ni 47.44, Pb 18.60, Sb 10.93 and S 23.03, total of 100.00 wt.%. Hrabákite is tetragonal, P4/mmm, a = 7.3085(4), c = 5.3969(3) Å, with V = 288.27(3) Å3 and Z = 1. The strongest reflections of the calculated powder X-ray diffraction pattern [d, Å (I)(hkl)] are: 3.6543(57)(200); 3.2685(68)(210); 2.7957(100)(211); 2.3920(87)(112); 2.3112(78)(310); 1.8663(74)(222); and 1.8083(71)(302). According to the single-crystal X-ray diffraction data (Rint = 0.0218), the unit cell of hrabákite is undoubtedly similar to the cell reported for tučekite. The structure contains four metal cation sites, two Sb (Sb1 dominated by Pb2+) and two Ni (with minor Co2+ content) sites. The close similarity in metrics between hrabákite and tučekite is due to similar bond lengths of Pb–S and Sb–S pairs. Hrabákite is named after Josef Hrabák, the former professor of the Příbram Mining College.

在捷克共和国波西米亚中部的普里布拉姆铀矿和贱金属区之一的第9竖井的废料堆中，在菱铁矿-闪锌矿脉石中有少量白云石-铁矿石中发现了新的矿物hrabákite（IMA2020-034）。 。Hrabákite与富含Pb的方铁矿，富含Hg的银，Stephanite，镍矿，Millerite，Gersdorffite，闪锌矿和方铅矿相关。新矿物以大小不超过120μm的稀有棱柱晶体和同素异形晶粒出现。Hrabákite为灰色，略带褐色。莫氏硬度是CA。5–6; 计算出的密度为6.37 g.cm –3。在反射光下，hrabákite为灰色，带有棕色调。双折射弱并且未观察到多色性。交叉极点下的各向异性非常弱（棕褐色），因此不存在。没有观察到内部反射。菱沸石的空气反射率值（R min – R max，％）为：在470 nm下为39.6–42.5，在546 nm下为45.0–47.5，在589 nm下为46.9–49.2和在650 nm下为48.9–51.2）。基于电子探针分析（n = 11）的hrabákite的经验公式为（Ni 8.91 Co 0.09 Fe 0.03）9.03（Pb 0.94 Hg 0.04）0.98（Sb 0.91 As 0.08）0.99 š 7.99。理想的配方是Ni 9 PbSbS 8，其需要Ni 47.44，Pb 18.60，Sb 10.93和S 23.03，总计为100.00 wt。％。Hrabákite是四方晶，P 4 / MMM，一个= 7.3085（4），C ^ = 5.3969（3）埃，用V = 288.27（3）3和Ž = 1计算出的粉末的最强反射的X射线衍射图案[ d，Å（I）（hkl）]为：3.6543（57）（200）；3.2685（68）（210）; 2.7957（100）（211）; 2.3920（87）（112）; 2.3112（78）（310）; 1.8663（74）（222）; 和1.8083（71）（302）。根据单晶X射线衍射数据（R int = 0.0218），毫无疑问，hrabákite的晶胞与报告的tučekite晶胞相似。该结构包含四个金属阳离子位点，两个Sb（以Pb 2+为主的Sb1 ）和两个Ni（具有少量Co 2+含量）的位点。hrabákite和tučekite之间度量标准的紧密相似性是由于Pb-S和Sb-S对的键长相似。Hrabákite以Příbram矿业学院的前教授JosefHrabák的名字命名。