Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany
<p>Regerite, KFe<span class="inline-formula"><sub>6</sub></span>(PO<span class="inline-formula"><sub>4</sub>)<sub>4</sub></span>(OH)<span class="inline-formula"><sub>7</sub></span>...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2023-09-01
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| Series: | European Journal of Mineralogy |
| Online Access: | https://ejm.copernicus.org/articles/35/805/2023/ejm-35-805-2023.pdf |
| _version_ | 1827808026037321728 |
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| author | C. Rewitzer R. Hochleitner I. E. Grey A. R. Kampf S. Boer C. M. MacRae |
| author_facet | C. Rewitzer R. Hochleitner I. E. Grey A. R. Kampf S. Boer C. M. MacRae |
| author_sort | C. Rewitzer |
| collection | DOAJ |
| description | <p>Regerite, KFe<span class="inline-formula"><sub>6</sub></span>(PO<span class="inline-formula"><sub>4</sub>)<sub>4</sub></span>(OH)<span class="inline-formula"><sub>7</sub></span>(H<span class="inline-formula"><sub>2</sub></span>O)<span class="inline-formula"><sub>6</sub></span> <span class="inline-formula">⋅</span> 4H<span class="inline-formula"><sub>2</sub></span>O, is the first new mineral species to be characterised from the
Kreuzberg pegmatite, Pleystein, in the Oberpfalz, Bavaria. It was found in
vugs on a specimen of drusy quartz, associated with rockbridgeite, strengite
and phosphosiderite. Regerite occurs as clusters of yellowish-green prisms,
typically 5 to 20 <span class="inline-formula">µ</span>m wide and up to 0.1 mm long. The crystals are
flattened on <span class="inline-formula"><i>{</i>100<i>}</i></span> and elongated along [001], and they
display the forms <span class="inline-formula"><i>{</i>100<i>}</i></span>, {010} and {011}. The measured
density is 2.69(2) g cm<span class="inline-formula"><sup>−3</sup></span>. Optically, regerite crystals are
biaxial (<span class="inline-formula">+)</span>, with <span class="inline-formula"><i>α</i>=1.670(5)</span>, <span class="inline-formula"><i>β</i>=1.690(5)</span> and <span class="inline-formula"><i>γ</i>=1.730(5)</span> (measured in white light), and 2<span class="inline-formula"><i>V</i></span> (meas) is 76(2)<span class="inline-formula"><sup>∘</sup></span>. The
empirical formula from electron microprobe analyses and crystal structure
refinement is K<span class="inline-formula"><sub>0.95</sub></span>(Fe<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M33" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">5.66</mn><mrow><mn mathvariant="normal">3</mn><mo>+</mo></mrow></msubsup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="18pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="f08d9cf95de36c6c2e907d3507055e88"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-35-805-2023-ie00001.svg" width="18pt" height="17pt" src="ejm-35-805-2023-ie00001.png"/></svg:svg></span></span>Ti<span class="inline-formula"><sub>0.45</sub>)<sub>Σ6.11</sub></span>(PO<span class="inline-formula"><sub>4</sub>)<sub>3.95</sub></span>(OH)<span class="inline-formula"><sub>7</sub></span>[(H<span class="inline-formula"><sub>2</sub></span>O)<span class="inline-formula"><sub>5.33</sub></span>(OH)<span class="inline-formula"><sub>0.88</sub></span>]<span class="inline-formula"><sub>Σ6.21</sub></span> <span class="inline-formula">⋅</span> 4H<span class="inline-formula"><sub>2</sub></span>O.
Regerite has monoclinic symmetry, with space group <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M43" display="inline" overflow="scroll" dspmath="mathml"><mrow><mi>P</mi><msub><mn mathvariant="normal">2</mn><mn mathvariant="normal">1</mn></msub><mo>/</mo><mi>c</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="387f17258900b89bb2b7f34c3d41ad1f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-35-805-2023-ie00002.svg" width="34pt" height="14pt" src="ejm-35-805-2023-ie00002.png"/></svg:svg></span></span> and
unit-cell parameters <span class="inline-formula"><i>a</i>=15.408(11)</span> Å, <span class="inline-formula"><i>b</i>=17.311(11)</span> Å, <span class="inline-formula"><i>c</i>=9.870(11)</span> Å, <span class="inline-formula"><i>β</i>=95.42(2)</span><span class="inline-formula"><sup>∘</sup></span>, <span class="inline-formula"><i>V</i>=2621(3)</span> Å<span class="inline-formula"><sup>3</sup></span> and <span class="inline-formula"><i>Z</i>=4</span>. The crystal structure was refined using synchrotron
single-crystal data to <span class="inline-formula"><i>w</i><i>R</i><sub>obs</sub>=0.065</span> for 6088 reflections with <span class="inline-formula"><i>I</i>>3<i>σ</i>(<i>I</i>)</span>. The structure type has not been previously reported. It
is made of heteropolyhedral layers parallel to <span class="inline-formula"><i>{</i>100<i>}</i></span> that consist of Fe-centred octahedra and PO<span class="inline-formula"><sub>4</sub></span>
tetrahedra. The layers are interconnected via edge-shared octahedral dimers
to form slit-like channels along [001] that are occupied by K<span class="inline-formula"><sup>+</sup></span> ions and
water molecules.</p> |
| first_indexed | 2024-03-11T22:05:27Z |
| format | Article |
| id | doaj.art-f85de709796245fc8538a2ccd554c486 |
| institution | Directory Open Access Journal |
| issn | 0935-1221 1617-4011 |
| language | English |
| last_indexed | 2024-03-11T22:05:27Z |
| publishDate | 2023-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | European Journal of Mineralogy |
| spelling | doaj.art-f85de709796245fc8538a2ccd554c4862023-09-25T08:04:15ZengCopernicus PublicationsEuropean Journal of Mineralogy0935-12211617-40112023-09-013580581210.5194/ejm-35-805-2023Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, GermanyC. Rewitzer0R. Hochleitner1I. E. Grey2A. R. Kampf3S. Boer4C. M. MacRae5private address: Graf von Bogen Str. 6, 93437 Furth im Wald, GermanyMineralogical State Collection (SNSB), Theresienstraße 41, 80333 Munich, GermanyCSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3169, AustraliaMineral Sciences Department, Natural History Museum of Los Angeles County, 900 Exposition Boulevard, Los Angeles, CA 90007, USAAustralian Synchrotron, ANSTO, 800 Blackburn Road, Clayton, Victoria 3168, AustraliaCSIRO Mineral Resources, Private Bag 10, Clayton South, Victoria 3169, Australia<p>Regerite, KFe<span class="inline-formula"><sub>6</sub></span>(PO<span class="inline-formula"><sub>4</sub>)<sub>4</sub></span>(OH)<span class="inline-formula"><sub>7</sub></span>(H<span class="inline-formula"><sub>2</sub></span>O)<span class="inline-formula"><sub>6</sub></span> <span class="inline-formula">⋅</span> 4H<span class="inline-formula"><sub>2</sub></span>O, is the first new mineral species to be characterised from the Kreuzberg pegmatite, Pleystein, in the Oberpfalz, Bavaria. It was found in vugs on a specimen of drusy quartz, associated with rockbridgeite, strengite and phosphosiderite. Regerite occurs as clusters of yellowish-green prisms, typically 5 to 20 <span class="inline-formula">µ</span>m wide and up to 0.1 mm long. The crystals are flattened on <span class="inline-formula"><i>{</i>100<i>}</i></span> and elongated along [001], and they display the forms <span class="inline-formula"><i>{</i>100<i>}</i></span>, {010} and {011}. The measured density is 2.69(2) g cm<span class="inline-formula"><sup>−3</sup></span>. Optically, regerite crystals are biaxial (<span class="inline-formula">+)</span>, with <span class="inline-formula"><i>α</i>=1.670(5)</span>, <span class="inline-formula"><i>β</i>=1.690(5)</span> and <span class="inline-formula"><i>γ</i>=1.730(5)</span> (measured in white light), and 2<span class="inline-formula"><i>V</i></span> (meas) is 76(2)<span class="inline-formula"><sup>∘</sup></span>. The empirical formula from electron microprobe analyses and crystal structure refinement is K<span class="inline-formula"><sub>0.95</sub></span>(Fe<span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M33" display="inline" overflow="scroll" dspmath="mathml"><mrow><msubsup><mi/><mn mathvariant="normal">5.66</mn><mrow><mn mathvariant="normal">3</mn><mo>+</mo></mrow></msubsup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="18pt" height="17pt" class="svg-formula" dspmath="mathimg" md5hash="f08d9cf95de36c6c2e907d3507055e88"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-35-805-2023-ie00001.svg" width="18pt" height="17pt" src="ejm-35-805-2023-ie00001.png"/></svg:svg></span></span>Ti<span class="inline-formula"><sub>0.45</sub>)<sub>Σ6.11</sub></span>(PO<span class="inline-formula"><sub>4</sub>)<sub>3.95</sub></span>(OH)<span class="inline-formula"><sub>7</sub></span>[(H<span class="inline-formula"><sub>2</sub></span>O)<span class="inline-formula"><sub>5.33</sub></span>(OH)<span class="inline-formula"><sub>0.88</sub></span>]<span class="inline-formula"><sub>Σ6.21</sub></span> <span class="inline-formula">⋅</span> 4H<span class="inline-formula"><sub>2</sub></span>O. Regerite has monoclinic symmetry, with space group <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M43" display="inline" overflow="scroll" dspmath="mathml"><mrow><mi>P</mi><msub><mn mathvariant="normal">2</mn><mn mathvariant="normal">1</mn></msub><mo>/</mo><mi>c</mi></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="34pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="387f17258900b89bb2b7f34c3d41ad1f"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="ejm-35-805-2023-ie00002.svg" width="34pt" height="14pt" src="ejm-35-805-2023-ie00002.png"/></svg:svg></span></span> and unit-cell parameters <span class="inline-formula"><i>a</i>=15.408(11)</span> Å, <span class="inline-formula"><i>b</i>=17.311(11)</span> Å, <span class="inline-formula"><i>c</i>=9.870(11)</span> Å, <span class="inline-formula"><i>β</i>=95.42(2)</span><span class="inline-formula"><sup>∘</sup></span>, <span class="inline-formula"><i>V</i>=2621(3)</span> Å<span class="inline-formula"><sup>3</sup></span> and <span class="inline-formula"><i>Z</i>=4</span>. The crystal structure was refined using synchrotron single-crystal data to <span class="inline-formula"><i>w</i><i>R</i><sub>obs</sub>=0.065</span> for 6088 reflections with <span class="inline-formula"><i>I</i>>3<i>σ</i>(<i>I</i>)</span>. The structure type has not been previously reported. It is made of heteropolyhedral layers parallel to <span class="inline-formula"><i>{</i>100<i>}</i></span> that consist of Fe-centred octahedra and PO<span class="inline-formula"><sub>4</sub></span> tetrahedra. The layers are interconnected via edge-shared octahedral dimers to form slit-like channels along [001] that are occupied by K<span class="inline-formula"><sup>+</sup></span> ions and water molecules.</p>https://ejm.copernicus.org/articles/35/805/2023/ejm-35-805-2023.pdf |
| spellingShingle | C. Rewitzer R. Hochleitner I. E. Grey A. R. Kampf S. Boer C. M. MacRae Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany European Journal of Mineralogy |
| title | Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany |
| title_full | Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany |
| title_fullStr | Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany |
| title_full_unstemmed | Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany |
| title_short | Regerite, KFe<sub>6</sub>(PO<sub>4</sub>)<sub>4</sub>(OH)<sub>7</sub>(H<sub>2</sub>O)<sub>6</sub>  ⋅  4H<sub>2</sub>O, the first new mineral species from the Kreuzberg pegmatite, Pleystein, Oberpfalz, Bavaria, Germany |
| title_sort | regerite kfe sub 6 sub po sub 4 sub sub 4 sub oh sub 7 sub h sub 2 sub o sub 6 sub thinsp ⋅ thinsp 4h sub 2 sub o the first new mineral species from the kreuzberg pegmatite pleystein oberpfalz bavaria germany |
| url | https://ejm.copernicus.org/articles/35/805/2023/ejm-35-805-2023.pdf |
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