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New Data on Minerals, vol.49, 2014

New Data on Minerals. 2014. Volume 49. 154 pages, 105 photos, drawings, and schemes.
Edited by V.K. Garanin, Professor, Doctor in Science.
Published by the FersmanMineralogicalMuseum, Russian Academy of Sciences.

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1 Summary
2 Editorial Board
3 Publishing group
4 Сontent
- 4.1 New Minerals and Their Varieties, New Finds of Rare Minerals, Mineral Paragenesis

Summary

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Editorial Board

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Publishing group

Сontent

New Minerals and Their Varieties, New Finds of Rare Minerals, Mineral Paragenesis

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Chukanov N.V., Rastsvetaeva R.K., Aksenov S.M., Blass G., Pekov I.V., Belakovskiy D.I., Tschörtner J., Schüller W., Ternes B.

Emmerichite, Ва₂Na(Na,Fe²⁺)₂(Fe³⁺,Mg)Ti₂(Si₂O₇)₂O₂F₂, a new lamprophyllite-group mineral from the Eifel volcanic region, Germany, p. 5 - 13

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 | Название = Emmerichite, Ва<sub>2</sub>Na(Na,Fe<sup>2+</sup>)<sub>2</sub>(Fe<sup>3+</sup>,Mg)Ti<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>F<sub>2</sub>, a new lamprophyllite-group mineral from the Eifel volcanic region, Germany, p. 5 - 13
 | Аннотация = Emmerichite, Ва<sub>2</sub>Na(Na,Fe<sup>2+</sup>)<sub>2</sub>(Fe<sup>3+</sup>,Mg)Ti<sub>2</sub>Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>F<sub>2</sub>, a new lamprophyllite-group mineral has been found in the Rother Kopf and Graulay basalt quarries, Eifel volcanic region, Rhineland-Palatinate, Germany in late assemblages consisting of nepheline, augite,melilite, götzenite, lileyite, fluorapatite, as well as (in Rother Kopf) leucite, phlogopite, magnetite, perovskite, and günterblassite. Emmerichite occurs as lamellar crystals up to 0.05 × 0.3 × 0.5 mm in size and epitaxial intergrowths with lileyite. The new mineral is brown, with vitreous luster. It is brittle, the Mohs' hardness is 3–4; cleavage is perfect parallel to {100}. The calculated density is 3.864 g/cm<sup>3</sup>. Emmerichite is biaxial, (+), a = 1.725(4), b= 1.728(4), g = 1.759(4). The chemical composition (electron microprobe Fe<sup>2+</sup>/Fe<sup>3+</sup> estimated from X-ray structural analysis, wt.%) is as follows: Na<sub>2</sub>O 5.44, K<sub>2</sub>O
-.03, CaO 1.98, SrO 3.23, BaO 25.94, MgO 3.13, MnO 2.22, FeO 4.85, Fe<sub>2</sub>O<sub>3</sub> 6.73, TiO<sub>2</sub> 15.21, ZrO<sub>2</sub> 0.52, Nb<sub>2</sub>O<sub>5</sub> 1.32, SiO<sub>2</sub> 27.13, F 3.54, -O=F2 -1.49, total is 100.78. The empirical formula is Ba<sub>1.49</sub>Sr<sub>0.27</sub>K<sub>0.19</sub>Na<sub>1.54</sub>Ca<sub>0.31</sub>Mn<sub>0.275</sub>Mg<sub>0.68</sub>Fe<sup>2+</sup><sub>0.59</sub>Fe<sup>3+</sup><sub>0.74</sub>Ti<sub>1.67</sub>Zr<sub>0.04</sub>Nb<sub>0.09</sub>Si<sub>3.97</sub>O<sub>16.36</sub>F<sub>1.64</sub>. The crystal structure has been refined on a single crystal to R=0.044. The new mineral is monoclinic C2/m, a=19.960(1), b=7.098(1), c=5.4074(3)Å, b=96.368(1)°, V=761.37(12)Å3, Z=2. Emmerichite is isostructural with other monoclinic minerals of the lamprophyllite group. Its crystal chemical formula is [Ba,Sr,K]<sub>2</sub>[(Na,Ca)(Na,Fe<sup>2+</sup>,Mn<sup>2+</sup>,Mg)<sub>2</sub>(Fe<sup>3+</sup>,Mg)][(Ti,Fe<sup>3+</sup>,Nb,Zr)<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>](F,O)<sub>2</sub>. The strongest lines in the X-ray diffraction pattern [d, Å (I, %) (hkl)]: 9.97 (55) (200); 3.461 (65) (510, 311, 401); 3.312 (40) (220, 600); 2.882 (38) (22-1, 420); 2.792 (100) (221, 511); 2.670 (56) (002, 601, 20-2); 2.629 (45) (710, 42-1); 2.140 (57) (131, 022, 621, 22-2). The type specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia.
+.03, CaO 1.98, SrO 3.23, BaO 25.94, MgO 3.13, MnO 2.22, FeO 4.85, Fe<sub>2</sub>O<sub>3</sub> 6.73, TiO<sub>2</sub> 15.21, ZrO<sub>2</sub> 0.52, Nb<sub>2</sub>O<sub>5</sub> 1.32, SiO<sub>2</sub> 27.13, F 3.54, -O=F<sub>2</sub> -1.49, total is 100.78. The empirical formula is Ba<sub>1.49</sub>Sr<sub>0.27</sub>K<sub>0.19</sub>Na<sub>1.54</sub>Ca<sub>0.31</sub>Mn<sub>0.275</sub>Mg<sub>0.68</sub>Fe<sup>2+</sup><sub>0.59</sub>Fe<sup>3+</sup><sub>0.74</sub>Ti<sub>1.67</sub>Zr<sub>0.04</sub>Nb<sub>0.09</sub>Si<sub>3.97</sub>O<sub>16.36</sub>F<sub>1.64</sub>. The crystal structure has been refined on a single crystal to R=0.044. The new mineral is monoclinic C2/m, a=19.960(1), b=7.098(1), c=5.4074(3)Å, b=96.368(1)°, V=761.37(12)Å3, Z=2. Emmerichite is isostructural with other monoclinic minerals of the lamprophyllite group. Its crystal chemical formula is [Ba,Sr,K]<sub>2</sub>[(Na,Ca)(Na,Fe<sup>2+</sup>,Mn<sup>2+</sup>,Mg)<sub>2</sub>(Fe<sup>3+</sup>,Mg)][(Ti,Fe<sup>3+</sup>,Nb,Zr)<sub>2</sub>(Si<sub>2</sub>O<sub>7</sub>)<sub>2</sub>O<sub>2</sub>](F,O)<sub>2</sub>. The strongest lines in the X-ray diffraction pattern [d, Å (I, %) (hkl)]: 9.97 (55) (200); 3.461 (65) (510, 311, 401); 3.312 (40) (220, 600); 2.882 (38) (22-1, 420); 2.792 (100) (221, 511); 2.670 (56) (002, 601, 20-2); 2.629 (45) (710, 42-1); 2.140 (57) (131, 022, 621, 22-2). The type specimen is deposited in the Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia.
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