| People | Locations | Statistics |
|---|---|---|
| Naji, M. |
| |
| Motta, Antonella |
| |
| Aletan, Dirar |
| |
| Mohamed, Tarek |
| |
| Ertürk, Emre |
| |
| Taccardi, Nicola |
| |
| Kononenko, Denys |
| |
| Petrov, R. H. | Madrid |
|
| Alshaaer, Mazen | Brussels |
|
| Bih, L. |
| |
| Casati, R. |
| |
| Muller, Hermance |
| |
| Kočí, Jan | Prague |
|
| Šuljagić, Marija |
| |
| Kalteremidou, Kalliopi-Artemi | Brussels |
|
| Azam, Siraj |
| |
| Ospanova, Alyiya |
| |
| Blanpain, Bart |
| |
| Ali, M. A. |
| |
| Popa, V. |
| |
| Rančić, M. |
| |
| Ollier, Nadège |
| |
| Azevedo, Nuno Monteiro |
| |
| Landes, Michael |
| |
| Rignanese, Gian-Marco |
|
Wouters, Johan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (18/18 displayed)
- 2022Structural study of bioisosteric derivatives of 5-(1 H-indol-3-yl)-benzotriazole and their ability to form chalcogen bonds
- 2021Triptycene Boronates, Boranes, and Boron Ate-Complexes
- 2020Synthesis, crystal structure and conformational analysis of an unexpected [1,5]dithiocine product of aminopyridine and thiovanillincitations
- 2020Complex mineralogical-geochemical sequences and weathering events in the supergene ore of the Cu–Co Luiswishi deposit (Katanga, D.R. Congo)citations
- 2017Assessing density functional theory approaches for predicting the structure and relative energy of salicylideneaniline molecular switches in the solid statecitations
- 2015Structural and energy insights on solid-state complexes with trimethoprim: A combined theoretical and experimental investigationcitations
- 2014How cocrystallization affects solid-state tautomerism : Stanozolol case studycitations
- 2013On the influence of using a zwitterionic coformer for cocrystallizationcitations
- 2013Structural study of prolinium/fumaric acid zwitterionic cocrystalscitations
- 2012Crystal structures of low-melting ionic transition-metal complexes with N-alkylimidazole ligandscitations
- 2010Cobalt(II) complexes of nitrile-functionalized ionic liquidscitations
- 2010On the fractional crystallization of palm olein:Solid solutions and eutectic solidificationcitations
- 2010Qingheiite-(Fe2+), Na2Fe2+MgAl(PO 4)3, a new phosphate mineral from the Sebastião Cristino pegmatite, Minas Gerais, Brazilcitations
- 2010Advantages of cocrystallization in the field of solid-statepharmaceutical chemistrycitations
- 2007Expedient, direct synthesis of (L)Pt(0)(1,6-diene) complexes from H 2PtCl6citations
- 2006Determination of physical changes of inulin related to sorption isothermscitations
- 2005Head-on immobilization of DNA fragments on CVD-diamond layers
- 2000Use of Theoretical Descriptors to Characterize Cation-π Binding Sites in (Macro)molecules
Places of action
| Organizations | Location | People |
|---|
article
Qingheiite-(Fe2+), Na2Fe2+MgAl(PO 4)3, a new phosphate mineral from the Sebastião Cristino pegmatite, Minas Gerais, Brazil
Abstract
<p>Qingheiite-(Fe<sup>2+</sup>), ideally Na<sub>2</sub>Fe <sup>2+</sup>MgAl(PO<sub>4</sub>)<sub>3</sub>, is a new mineral species from the Sebastião Cristino pegmatite, Minas Gerais, Brazil. It occurs as rims around frondelite grains, included in a matrix of quartz and albite. Frondelite is locally replaced by jahnsite, cyrilovite and Fe-Mn oxides. Qingheiite-(Fe<sup>2+</sup>) is transparent and exhibits a dark green colour, with a resinous lustre and with a pale to bottle green streak. It is non-fluorescent, brittle, and shows a perfect {010} cleavage. The estimated Mohs hardness is 4. The measured density is 3.6(2) g/cm<sup>3</sup>; the calculated density is 3.54 g/cm<sup>3</sup>. Qingheiite-(Fe<sup>2+</sup>) is biaxial negative, with α = 1.692(5), β; = 1.718(3), and γ= 1.720(5) (with A = 590 nm). Pleochroism is from pale pinkish brown (X) to pale green (Y) and pale bluish grey (Z). The calculated 2V angle is 31°, and a strong dispersion r > v has been observed. The β index is parallel to the b crystallographic axis; α and γ lie in the (010) plane. Electron microprobe analyses gave P<sub>2</sub>O<sub>5</sub> 46.51, Al<sub>2</sub>O <sub>3</sub> 6.94, Fe<sub>2</sub>O<sub>3</sub> 10.58, FeO 11.46, MgO 6.32, MnO 11.23, CaO 0.24, Na<sub>2</sub>O 6.27, K<sub>2</sub>O 0.01, total 99.56 wt. %. The resulting empirical formula, calculated on the basis of 3 P, is (□<sub>0.65</sub>Na<sub>0.35</sub>)<sub>Σ1.00</sub>(Na <sub>0.58</sub>Mn<sup>2+</sup> <sub>0.40</sub>Cao.o2)z;i.oo (Fe<sup>2+</sup> <sub>0.68</sub>Mn<sup>2+</sup> <sub>0.32</sub>)<sub>Σ1.00</sub> (Mg <sub>0.72</sub>Fe<sup>3+</sup> <sub>0.23</sub>Fe<sup>2+</sup> <sub>0.05</sub>) <sub>Σ1.00</sub>(Al<sub>0.62</sub>Fe<sup>3+</sup> <sub>0.38</sub>) Σ<sub>1.00</sub>[PO<sub>4</sub>]3. The single-crystal unit-cell parameters are a = 11.910(2), b = 12.383(3), c = 6.372(1) Å, β = 114.43(3)°, and V= 855.6(3) Å<sup>3</sup>, space group P2 <sub>1</sub>/n. The eight strongest lines in the powder X-ray diffraction pattern [d(in Å)(I)(hkl)] are: 3.468(35)(310), 3.047(100)(112), 2.849(80)(312), 2.810(35)(222), 2.711(40)(330), 2.688(90)(240), 2.500(40)(132; 112), 2.074(30)(313). Qingheiite-(Fe<sup>2+</sup>) is the Fe<sup>2+</sup> analogue of qingheiite, and belongs to the wyllieite group of minerals. The crystal structure has been refined, based on single-crystal X-ray diffraction data, to R<sub>1</sub> = 2.91%. The mineral species and name were approved by the Commission on New Minerals, Nomenclature and Classification of the International Mineralogical Association (CNMNC-IMA) under number 2009-076.</p>