Heamanite-(Ce) (IMA 2020-001), ideally (K0.5Ce0.5)TiO3, is a new perovskite-group mineral found as an inclusion in a diamond from the Gahcho Kué mine in the Northwest Territories, Canada. It occurs as brown, translucent single crystals with an average maximum dimension of ~80 μm, associated with rutile and calcite. The luster is adamantine, and the fracture conchoidal. Heamanite-(Ce) is the K-analog of loparite-(Ce), ideally (NaCe)Ti2O6. The Mohs hardness is estimated to be 5½ by comparison to loparite-(Ce), and the calculated density is 4.73(1) g/cm3. Electron microprobe wavelength-dispersive spectrometric analysis (average of 34 points) yielded: CaO 10.70, K2O 7.38, Na2O 0.16, Ce2O3 13.77, La2O3 8.22, Pr2O3 0.84, Nd2O3 1.59, SrO 6.69, BaO 2.96, ThO2 0.36, PbO 0.15, TiO2 45.77, Cr2O3 0.32, Al2O3 0.10, Fe2O3 0.09, Nb2O5 0.87, UO3 0.01, total 99.98 wt%. The empirical formula, based on 3 O atoms, is: [(K0.268Na0.009)Σ0.277(Ce0.143La0.086Pr0.009Nd0.016)Σ0.254(Ca0.326Sr0.110Ba0.033Pb0.001)Σ0.470Th0.002]Σ1.003 (Ti0.979Nb0.011Cr0.007Al0.003Fe0.002)Σ1.002O3. The Goldschmidt tolerance factor for this formula is 1.003. Heamanite-(Ce) is cubic, space group Pm3m, with unit-cell parameter a = 3.9129(9) Å, and volume V = 59.91(4) Å3 (Z = 1). The crystal structure was solved using single-crystal X-ray diffraction data and refined to R1(F) = 2.61%. Heamanite-(Ce) has the aristotypic perovskite structure and adopts the same structure as isolueshite and tausonite. The six strongest diffraction lines are [dobs in angstroms (I in percentages) (hkl)]: 2.764 (100) (110), 1.954 (41) (200), 1.596 (36) (211), 1.045 (16) (321), 1.236 (13) (310), and 1.382 (10) (220). The Raman spectrum of heamanite-(Ce) shows two broad bands at 560 and 787 cm−1, with no bands observed above 1000 cm−1. Heamanite-(Ce) is named after Larry Heaman, a renowned scientist in the field of radiometric dating applied to diamond-bearing kimberlites, mantle-derived eclogites, and lamprophyre dikes. The dominant REE should appear as a Levinson suffix, hence heamanite-(Ce).

中文翻译：

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Heamanite-(Ce), (K0.5Ce0.5)TiO3，一种新的钙钛矿超群矿物，发现于加拿大 Gahcho Kué 的钻石中

Heamanite-(Ce) (IMA 2020-001)，理想情况下是 (K0.5Ce0.5)TiO3，是一种新的钙钛矿族矿物，在加拿大西北地区 Gahcho Kué 矿的钻石中发现。它以棕色、半透明的单晶形式出现，平均最大尺寸约为 80 μm，与金红石和方解石有关。光泽金刚，断口呈贝壳状。Heamanite-(Ce) 是 Loparite-(Ce) 的 K 类似物，理想的是 (NaCe)Ti2O6。与 Loparite-(Ce) 相比，Mohs 硬度估计为 5½，计算出的密度为 4.73(1) g/cm3。电子微探针波长色散光谱分析（平均 34 点）得出：CaO 10.70、K2O 7.38、Na2O 0.16、Ce2O3 13.77、La2O3 8.22、Pr2O3 0.84、Nd2O3 1.59、SrO 6.69、BaO 2.96、ThO2 5.36、45 PbO.7 0。 , Cr2O3 0.32, Al2O3 0.10, Fe2O3 0.09, Nb2O5 0.87, UO3 0.01, 共 99 个。98 重量％。基于 3 个 O 原子的经验公式为：[(K0.268Na0.009)Σ0.277(Ce0.143La0.086Pr0.009Nd0.016)Σ0.254(Ca0.326Sr0.110Ba0.033Pb0.001)Σ0。 470Th0.002]Σ1.003 (Ti0.979Nb0.011Cr0.007Al0.003Fe0.002)Σ1.002O3。此公式的 Goldschmidt 容差因子为 1.003。Heamanite-(Ce) 是立方的，空间群 Pm3m，晶胞参数 a = 3.9129(9) Å，体积 V = 59.91(4) Å3 (Z = 1)。使用单晶 X 射线衍射数据解析晶体结构并精炼至 R1(F) = 2.61%。Heamanite-(Ce) 具有亚斯托型钙钛矿结构，与异硫橄榄石和钛白铁矿结构相同。六个最强的衍射线是 [dobs in 埃 (I in percent) (hkl)]: 2.764 (100) (110), 1.954 (41) (200), 1.596 (36) (211), 1.045 (16) (321) )、1.236 (13) (310) 和 1.382 (10) (220)。赤铁矿-(Ce) 的拉曼光谱在 560 和 787 cm-1 处显示出两个宽带，在 1000 cm-1 以上没有观察到谱带。Heamanite-(Ce) 以拉里·希曼 (Larry Heaman) 的名字命名，拉里·希曼 (Larry Heaman) 是辐射测年领域的著名科学家，应用于含金刚石的金伯利岩、地幔衍生榴辉岩和灯石岩脉。占主导地位的 REE 应显示为 Levinson 后缀，因此是赤铁矿-(Ce)。