| Reference Type | Journal (article/letter/editorial) |
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| Title | Yamhamelachite, KCrP2O7, a new natural pyrophosphate from phosphide-bearing breccia of the Hatrurim Complex, Negev Desert, Israel |
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| Journal | Mineralogical Magazine |
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| Authors | Galuskin, Evgeny V. | Author |
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| Kusz, Joachim | Author |
| Galuskina, Irina O. | Author |
| Vapnik, Yevgeny | Author |
| Zieliński, Grzegorz | Author |
| Year | 2025 |
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| Page(s) | 1-19 |
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| DOI | doi:10.1180/mgm.2025.27Search in ResearchGate |
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| Generate Citation Formats |
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| Classification | Not set | LoC | Not set |
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| Mindat Ref. ID | 18364466 | Long-form Identifier | mindat:1:5:18364466:8 |
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| GUID | 0 |
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| Full Reference | Galuskin, Evgeny V.; Kusz, Joachim; Galuskina, Irina O.; Vapnik, Yevgeny; Zieliński, Grzegorz (2025) Yamhamelachite, KCrP2O7, a new natural pyrophosphate from phosphide-bearing breccia of the Hatrurim Complex, Negev Desert, Israel. Mineralogical Magazine, 1-19 doi:10.1180/mgm.2025.27 |
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| Plain Text | Galuskin, Evgeny V.; Kusz, Joachim; Galuskina, Irina O.; Vapnik, Yevgeny; Zieliński, Grzegorz (2025) Yamhamelachite, KCrP2O7, a new natural pyrophosphate from phosphide-bearing breccia of the Hatrurim Complex, Negev Desert, Israel. Mineralogical Magazine, 1-19 doi:10.1180/mgm.2025.27 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Phosphide-bearing diopside-anorthite paralava found in the distribution area of the pyrometamorphic rocks of the Hatrurim Complex in Jordan (Daba-Siwaqa field) and Israel (Hatrurim Basin field) have yielded a large number of new phosphides and phosphates. In 2019, a small outcrop of phosphide-bearing breccia with cement composed of gehlenite flamite paralava was discovered in the Hatrurim Basin. A new pyrophosphate, yamhamelachite, KCrP2O7 (P21/c, a = 7.3574(3), b = 9.9336(4), c = 8.1540(4) Å, β = 106.712(5)°, V = 570.77(5)Å3, Z = 4), occurs at the phosphide-enriched boundary between an altered sedimentary xenolith and the gehlenite-flamite paralava. Yamhamelachite forms green aggregates in which the size of grains does not exceed 25-30 m. The mineral is transparent with a glassy lustre. Yamhamelachite is brittle with conchoidal fracture. Mohs hardness = 4. The empirical formula of yamhamelachite calculated on the basis of average microprobe analyses is (K0.89Ca0.01�0.10)∑1.00 Cr3+ 0.50V3+ 0.33Al0.15Fe3+ 0.04 Ti4+ 0.03)∑1.05P1.98O7. The density calculated from the empirical formula and structural data is 3.035 g·cm-3. Cr3+ in yamhamelachite is substituted by V3+, and in a few cases V is marginally more abundant than Cr, indicating the presence of a potentially new mineral with the formula KVP2O7. Yamhamelachite consists of layers of Cr3+-octahedra and pyrophosphate groups connected at their apices, and potassium located within channels parallel to [001]. A characteristic feature of phosphide aggregates associated with yamhamelachite is the presence of two generations of barringerite, the earlier of which has higher Cr and V content. In the general crystallisation sequence, yamhamelachite appears after phosphides (+pyrrhotite, daubréelite) and then spinels of the chromite-magnetite series crystallise, along with ferromerrillite and ferroalluaudite. The source of chromium for yamhamelachite was mainly V-Cr-bearing pyrrhotite and V-bearing daubréelite. The low Fe3+ content in yamamelachite, likely related to its late-stage alteration, indicates that it crystallised from phosphate melt under reducing conditions at ~1000°С. |
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