| Reference Type | Journal (article/letter/editorial) |
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| Title | Crystal chemistry and stability of wuyanzhiite, a new mineral dimorphous with chalcocite from the Bofang Copper Mine, Hunan, China |
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| Journal | American Mineralogist |
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| Authors | Gu, Xiangping | Author |
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| Shi, Xiangyang | Author |
| Yang, Hexiong | Author |
| Liu, Guanghua | Author |
| Year | 2026 (May) | Volume | < 111 > |
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| Page(s) | 736-745 | Issue | < 5 > |
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| URL | |
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| DOI | doi:10.2138/am-2025-9910Search in ResearchGate |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 18924086 | Long-form Identifier | mindat:1:5:18924086:4 |
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| GUID | 0 |
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| Full Reference | Gu, Xiangping; Shi, Xiangyang; Yang, Hexiong; Liu, Guanghua (2026) Crystal chemistry and stability of wuyanzhiite, a new mineral dimorphous with chalcocite from the Bofang Copper Mine, Hunan, China. American Mineralogist, 111 (5). p.736-745. doi:10.2138/am-2025-9910 |
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| Plain Text | Gu, Xiangping; Shi, Xiangyang; Yang, Hexiong; Liu, Guanghua (2026) Crystal chemistry and stability of wuyanzhiite, a new mineral dimorphous with chalcocite from the Bofang Copper Mine, Hunan, China. American Mineralogist, 111 (5). p.736-745. doi:10.2138/am-2025-9910 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | A new mineral species, wuyanzhiite, ideally Cu2S (IMA 2017-081), dimorphous with chalcocite, was discovered from the Bofang sandstone-type copper deposit, Hengyang, Hunan, China. It occurs as granular aggregates or oriented ribbons from 10 to over 500 μm in size, composed of nanometric to micrometric anhedral crystals. Associated minerals include chalcocite, djurleite, digenite, sphalerite, tennantite-(Zn), bornite, pyrite, and smithsonite with minor presence of uraninite, arsenic, zeunerite and kasolite. Wuyanzhiite is opaque with dark gray color, metallic luster and black streak, brittle with uneven fracture and has Mohs hardness of 3 and calculated density of 5.618 g/cm3. In reflected light microscope, wuyanzhiite shows a gray blue color and is darker with more Fe contents. The reflectance values (%) are 27.0–29.3 (470 nm), 23.8–26.6 (546 nm), 23.1–26.3 (589 nm) and 21.1–25.2 (650 nm). The empirical chemical formula from the average of 75 microprobe analyses is (Cu1+1.801Cu2+0.081Fe2+0.018Ag0.001)Σ1.901S1.000 based on S = 1 and charge balance with Fe2+ assumed. The chemical composition of wuyanzhiite covers a wide range of ratio of cation/S from 1.993 to 1.710 and Fe content from 0 to 2.88 wt% (0–0.074 apfu) with significant negative correlations between Cu (apfu), (Cu + Ag)/S and Fe (apfu) and a positive correlation between Cu2+ (apfu) and Fe (apfu). Wuyanzhiite is the tetragonal polymorph of Cu2S with space group P43212 and unit-cell parameters a = 4.0042(4) Å, c = 11.2555(13) Å, V = 180.47(3) Å3, Z = 4. The crystal structure of wuyanzhiite, refined to R1 = 0.0480 for 131 independent reflections (I > 2σ(I)), is characterized by approximate cubic close packing of S atoms in [0 −1 2] with interlayer distance of 3.554 Å. The Cu atoms are located at the centers of nearly equilateral triangles of S atoms with Cu-S bond lengths from 2.296 Å to 2.317 Å and the CuS3 triangles are corner-connected to form a framework with each S atom shared by six CuS3 triangles. The high Fe content (>0.7 wt%) in wuyanzhiite may enhance its stability at ambient conditions. Wuyanzhiite honors Prof. Yanzhi Wu (1931–2014) at Central South University, Changsha, China. |
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