| Reference Type | Journal (article/letter/editorial) |
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| Title | Hartkoppeite, a new mineral with a novel polyoxometalate sandwich cluster |
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| Journal | American Mineralogist |
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| Authors | Kampf, Anthony R. | Author |
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| Möhn, Gerhard | Author |
| Ma, Chi | Author |
| Désor, Joy | Author |
| Year | 2026 (April 8) |
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| Publisher | Mineralogical Society of America |
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| URL | |
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| DOI | doi:10.2138/am-2026-10210Search 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 | 19821917 | Long-form Identifier | mindat:1:5:19821917:2 |
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| GUID | 0 |
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| Full Reference | Kampf, Anthony R.; Möhn, Gerhard; Ma, Chi; Désor, Joy (2026) Hartkoppeite, a new mineral with a novel polyoxometalate sandwich cluster. American Mineralogist. doi:10.2138/am-2026-10210 |
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| Plain Text | Kampf, Anthony R.; Möhn, Gerhard; Ma, Chi; Désor, Joy (2026) Hartkoppeite, a new mineral with a novel polyoxometalate sandwich cluster. American Mineralogist. doi:10.2138/am-2026-10210 |
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| In | Link this record to the correct parent record (if possible) |
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| Abstract/Notes | Abstract Hartkoppeite (IMA2025-056), Ca4Mn2+Mo6+6As5+4O32(OH)2(H2O)14·5H2O, is a newly approved mineral species from the Fuchs quarry, Hartkoppe, Sailauf, Bavaria, Germany. Hartkoppeite occurs as elongated and striated tabular crystals up to about 0.2 mm long. Tablets are flattened on {110}, elongated and striated parallel to [001], and exhibit the forms {110}, {1-10}, and {001}. The mineral is colorless and transparent with vitreous luster and white streak. The Mohs hardness is ∼2½. The mineral has brittle tenacity, stepped fracture, and three cleavages: {110} very good, {001} and {1-10} good. The measured density is 2.88(2) g·cm-3. The mineral is optically biaxial (+), α = 1.692(5), β = 1.693(5), γ = 1.718(5) (white light); 2Vmeas = 22(1)°; moderate r 2σI reflections) contains a novel polyoxometalate sandwich cluster of formula {Ca4Mn2+2(H2O)10[Mo6+6As5+4O32(OH)2]2}8-. |
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