scholarly journals Mineralogie antimonového výskytu Mikulovický vrch u Kadaně (Česká republika)

2020 ◽  
Vol 28 (1) ◽  
pp. 48-57
Author(s):  
Jiří Sejkora ◽  
Petr Pauliš ◽  
Roman Gramblička ◽  
Ondřej Pour
Keyword(s):  
Raman Spectroscopy ◽  
Czech Republic ◽  
Empirical Formula ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Ideal Composition ◽  
The Ideal

Two rare sulfosalt minerals, fülöppite and plagionite, have been determined in samples from a small abandoned Sb occurrence Mikulovický vrch near Kadaň, northern Bohemia, Czech Republic. The more abundant fülöppite forms grey aggregates (up to 5 mm in size) with metallic lustre in quartz gangue and rare crystals up to 1.5 mm across in association with stibnite, plagionite, sphalerite, pyrite and arsenopyrite. Fülöppite is monoclinic, space group C2/c with refined unit-cell parameters: a 13.443(2), b 11.737(2), c 16.953(2) Å, β 94.69(1)° and V 2665.9(5) Å3. Its empirical formula (mean of 93 point analyses) is (Pb2.80Sn0.01Hg0.01)Σ2.82Sb8.18S14.99. Two types of plagionite were found as irregular aggregates up to 200 μm in size in quartz gangue, ussualy in association with fülöppite. The first rarer one is close to the ideal composition with empirical formula (mean of 10 point analyses) (Pb4.90Hg0.01)Σ4.91Sb8.07S17.02; the second is distinctly Pb-poor with the calculated N homologue number in the range of 1.37 - 1.74 and empirical formula (mean of 62 point analyses) (Pb4.31Sn0.02Hg0.01)Σ4.34Sb8.53S17.13. Determination of fülöppite and Pb-poor plagionite were also confirmed by Raman spectroscopy. Gypsum, valentinite, native sulphur and jarosite were detected as products of weathering of primary mineralization.

Pb-Sb zrudnění z Antimonitové žíly, důl Rudolf, Bohutín (Česká republika)

2021 ◽  
Vol 29 (2) ◽  
pp. 275-280
Author(s):  
Pavel Škácha ◽  
Jiří Sejkora
Keyword(s):  
Czech Republic ◽  
Chemical Composition ◽  
Empirical Formula ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Ore District ◽  
Archive Material

The Pb-Sb mineralization with dominant stibnite and plagionite and associated semseyite and zinkenite was found in an archive material collected at the Antimonitová vein, Bohutín, Březové Hory ore district (Czech Republic). Plagionite forms subhedral aggregates up to 1 mm in size. The unit-cell parameters of plagionite for monoclinic space group C2/c refined from the X-ray powder data are: a 13.4890(17), b 11.8670(14), c 19.997(2) Å, β 107.199(8)° and V 3057.9(6) Å3. Its chemical composition (average of 26 analyses, based on 30 apfu) corresponds to the empirical formula Pb5.02Sb8.15S16.82. Associated zinkenite is forming subhedral crystals up to 1 mm in size. Its empirical formula can be expressed as (Cu0.25Ag0.02Fe0.01)Σ0.28Pb9.22Sb22.19S41.31 (average of 26 analyses, based on 73 apfu). Semseyite aggregates have the empirical formula (Pb8.72Fe0.14)8.86Sb8.42S20.73 (average of 11 analyses, based on 38 apfu).

Zeolitová mineralizace s gmelinitem-K z Jedlky u Benešova nad Ploučnicí (Česká republika)

2021 ◽  
Vol 29 (2) ◽  
pp. 213-229
Author(s):  
Petr Pauliš ◽  
Libor Hrůzek ◽  
Oldřich Janeček ◽  
Zdeněk Dolníček ◽  
Volker Betz ◽  
...  
Keyword(s):  
Czech Republic ◽  
Empirical Formula ◽  
Unit Cell ◽  
Mineral Species ◽  
Chemical Analyses ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Quantitative Chemical

A new locality of zeolite minerals occurs on the NE edge of the Jedlka village, at the SE slope of the Hlídka hill, 2 km to W of Benešov nad Ploučnicí (northern Bohemia, Czech Republic). The mineralization is developed in Cenozoic analcime-nepheline tephrite. Ten zeolite mineral species (gmelinite-K, analcime, harmotome, chabazite-Ca, lévyne-Ca, mezolite, natrolite, offretite, phillipsite-K, thomsonite-Ca) were found in small amygdule cavities of tephrite. The most interesting is gmelinite-K, a rare zeolite worldwide, which forms clear, white or slightly yellowish, hexagonal lenticular crystals up to 7 mm, always intergrown with the chabazite-Ca. The unit-cell parameters of gmelinite-K, refined from the powder X-ray data, are a = 13.795 (19), c = 9.811(6) Å and V = 1616.8(3) Å3; its quantitative chemical analyses correspond to the empirical formula (K2.32Ca1.86Sr0.53Na0.20Ba0.19)Σ5.10(Al8.14Si16.01O48)·22H2O.

scholarly journals Zeolitová mineralizace z Libé u Chebu (Česká republika)

2020 ◽  
Vol 28 (1) ◽  
pp. 152-160
Author(s):  
Petr Pauliš ◽  
Jiří Svejkovský ◽  
Zdeněk Dolníček ◽  
Petr Matys ◽  
Luboš Vrtiška ◽  
...  
Keyword(s):  
Czech Republic ◽  
Empirical Formula ◽  
Unit Cell ◽  
Chemical Analyses ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Snow White

A new occurrence of zeolite mineralization with phillipsite-K, phillipsite-Ca, thomsonite-Ca, natrolite and gonnardite has been discovered in an active basalt quarry in the Libá village near Cheb (Czech Republic). Phillipsites in small cavities form druses of white or colourless crystals up to 1 mm in size. Chemical analyses of phillipsite-K correspond to the empirical formula (K1.85Na1.24Ca0.83Ba0.27Sr0.01)Σ4.20(Al6.28Si10.33O32)·12H2O and phillipsite-Ca to (Ca1.84K1.33Na0.14Ba0.06)Σ3.37(Al5.97Si10.20O32)·12H2O. The unit-cell parameters were refined from the powder X-ray data for phillipsite-Ca as: a 9.924(2), b 14.309(3), c 8.7414(14) Å, β 124.92(2)° and V 1017.8(5) Å3. Thomsonite-Ca forms transparent hemispheric radial aggregates up to 1 cm in size. Its unit-cell parameters refined from the powder X-ray data are a 13.105(5), b 13.857(5), c 13.247(6) Å and V 2266.7(6) Å3 and its chemical analyses correspond to the empirical formula Ca1.79Sr0.18Na1.05(Al4.81 Si5.15)O20·6H2O. Natrolite occurs as snow white hemispheric radial clusters. Its unit-cell parameters refined from the powder X-ray data are a 18.326(7), b 18.569(7), c 6.594(3) Å and V 2243.8(9) Å3 and empirical formula is Na1.60Ca0.05(Al2.08 Si3.02)O10·2H2O. Gonnardite forms colourless or white aggregates of flat acicular crystals up to 2 mm in size. Its unit-cell parameters refined from the powder X-ray data are a 13.221(8), c 6.6233(4) Å and V 1156.9 Å3 and empirical formula is (Na3.14Ca2.21Sr0.02)Σ5.37(Al8.92Si11.41)Σ20.33O40·12H2O.

scholarly journals Böhmit a doprovodná zeolitová mineralizace ze Soutěsek u Děčína (Česká republika)

2021 ◽  
Vol 29 (1) ◽  
pp. 164-177
Author(s):  
Petr Pauliš ◽  
Libor Hrůzek ◽  
Oldřich Janeček ◽  
Zdeněk Dolníček ◽  
Luboš Vrtiška ◽  
...  
Keyword(s):  
Czech Republic ◽  
Empirical Formula ◽  
Unit Cell ◽  
Chemical Analyses ◽  
Altered Rock ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
The Town

A new locality of böhmite and zeolite minerals, called „Soutěsky above the quarry“, occurs near the quarry „Soutěsky“ on the SW slope of the Hlídka hill, eastward of the Soutěsky village, about 5 km SW od the town of Děčín (Czech Republic). The mineralization is bound to vugs of Cenozoic volcanics. Böhmite forms mostly whitish to brownish hemispherical to spherical clusters up to 5 mm in size. The unit-cell parameters of böhmite, refined from the X-ray powder data, are a 2.871 (3), b 12.216(9), c 3.699(4) Å and V 129.7(2) Å3. Chemical analyses correspond to the empirical formula (Al0.92 Si0.06)Σ0.98O(OH). The following zeolites have been found in association with böhmite: thomsonite-Ca, phillipsite-K, gismondine, chabazite-Ca and analcime, as well as calcite. Minerals crystallized in following succession: calcite I → phillipsite-K → böhmite → calcite II → thomsonite-Ca → gismondine → calcite III. Independently, (older) analcime and (younger) chabazite-Ca occur. These minerals probably crystallized from low tempered solutions, enriched in Al ions and alkalies, the source of which can be found in altered rock-forming alumosilicates (analcime, nepheline).

scholarly journals Namibit a doprovodná mineralizace fluoritové žíly Nadějná u Kotliny v Krušných horách (Česká republika)

2020 ◽  
Vol 28 (1) ◽  
pp. 170-178
Author(s):  
Petr Pauliš ◽  
Roman Gramblička ◽  
Luboš Vrtiška ◽  
Zdeněk Dolníček ◽  
Ondřej Pour ◽  
...  
Keyword(s):  
Czech Republic ◽  
Raman Spectra ◽  
Empirical Formula ◽  
Unit Cell ◽  
Chemical Analyses ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
Dark Green

Supergene Bi mineralization with namibite, bismutoferrite and bismutite was found on a quartz-fluorite vein Nadějná near the Kotlina in the Krušné hory Mts. (Czech Republic). Namibite forms green coatings on the cracks of fluorite veins and more rarely dark green glassy lustrous, hedgehog-shaped aggregates up to 0.2 mm in size formed by flat needle-like crystals. The unit-cell parameters of namibite refined from the powder X-ray data are: a 6.2096(18), b 7.395(2), c 7.4708(18) Å, α 90.1(2)°, β 108.73(15)°, γ 107.45(19)° and V 308.09(15) Å3. Its chemical analyses correspond to the empirical formula (Cu0.93Fe0.03Ca0.01)Σ0.97(BiO)1.79(V0.97P0.02Cr0.01)Σ1.00O4(OH)0.75. Bismutoferrite forms yellow powdery aggregates in cracks and in small cavities of fluorite. Its chemical analyses correspond to the empirical formula (Fe1.91 Cu0.03Mg0.02Al0.02Ca0.01)Σ1.99Bi0.92(SiO4)2.00(OH)0.68. Bismutite in the fluorite vein forms yellow-white pseudomorphoses probably after the acicular crystals of primary Bi sulfide (emplectite or bismuthinite) up to 2 mm long. Study of Raman spectra was performed for all studied minerals.

Coronadit z dolu Řimbaba v Bohutíně u Příbrami (Česká republika)

2021 ◽  
Vol 29 (2) ◽  
pp. 281-284
Author(s):  
Petr Pauliš ◽  
Luboš Vrtiška ◽  
Zdeněk Dolníček ◽  
Radana Malíková ◽  
Ondřej Pour
Keyword(s):  
Czech Republic ◽  
Diffraction Data ◽  
Empirical Formula ◽  
Unit Cell ◽  
Chemical Analyses ◽  
X Ray Diffraction ◽  
Unit Cell Parameters ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters

Along with the abundant pyromorphite, relatively frequent coronadite was found in the Řimbaba mine in Bohutín near Příbram (Czech Republic). Coronadite forms up to 5 mm thick black matt and greasy coatings and cavity fillings. The unit cell parameters of coronadite, refined from the powder X-ray diffraction data, are a 9.943(17), b 2.876(8), c 9.820(11) Å, β 90.4(5)° and V 280.8(9) Å3 (space group I2/m). Chemical analyses correspond to the empirical formula Pb1.53Sb0.07Zn0.02(Mn4+5.62Mn3+2.06)O16.

scholarly journals Synthesis, spectroscopic studies and X-ray structure determination of two mononuclear copper complexes derived from the Schiff base ligand N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene)ethane-1,2-diamine

2019 ◽  
Vol 10 (3) ◽  
pp. 201-208
Author(s):  
Pokpa Haba ◽  
Adama Sy ◽  
Farba Bouyagui Tamboura ◽  
Mamour Sarr ◽  
Ibrahima Elhadji Thiam ◽  
...  
Keyword(s):  
Schiff Base ◽  
Crystal Lattice ◽  
Structure Determination ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Unit Cell Parameters ◽  
Space Group ◽  
X Ray ◽  
Cell Parameters

Reactions of the Schiff base N,N-dimethyl-N'-((5-methyl-1H-imidazol-4-yl)methylene) ethane-1,2-diamine (HL), synthesised in situ, with chloride or thiocyanate copper (II) salt; afforded two new mononuclear complexes, [Cu(HL)Cl2]·H2O (1) and [Cu(HL)(SCN)2] (2). These compounds have been studied and characterized by elemental analysis, IR and UV-Vis spectroscopies, electrochemistry, molar conductivity and room temperature magnetic measurements. Single crystal X-ray structure determination of the complexes revealed the presence of neutral moieties in the asymmetric unit. The mononuclear (1) crystallises in the monoclinic space group P21/c with the following unit cell parameters a = 7.4355(3) Å, b = 7.2952(3) Å, c = 26.2729(11) Å, β = 93.461(4)°, V = 1422.52(10) Å3, Z = 4, R1 = 0.033 and wR2 = 0.082 and the mononuclear complex (2) crystallises in the monoclinic space group C2/c with the following unit cell parameters a = 26.2578(7) Å, b = 7.4334(2) Å, c = 16.6237(5) Å, β = 99.089(3)°, V = 3203.95(16) Å3, Z = 8, R1 = 0.037 and wR2 = 0.104. In both complexes the ligand acts in tridentate fashion and the coordination environment of the copper atom can be described as distorted square pyramidal. The crystal lattice of the complex 1 is stabilized by electrostatic forces of attraction and O–H···Cl, C–H···O, N–H···Cl, and C–H···Cl, hydrogen bonding interactions while the crystal lattice of the complex 2 is stabilized by N–H···S and C–H···N.

scholarly journals Vzácný allanpringit - produkt alterace fluorwavellitu z lomu Milina u Zaječova (Česká republika)

2020 ◽  
Vol 28 (1) ◽  
pp. 126-131
Author(s):  
Luboš Vrtiška ◽  
Václav Zemek ◽  
Radana Malíková
Keyword(s):  
Czech Republic ◽  
Empirical Formula ◽  
Unit Cell ◽  
Yellow Powder ◽  
Unit Cell Parameters ◽  
Cell Parameters ◽  
Barrandian Area

A very rare phosphate allanpringite was found in the abandoned quarry Milina near Zaječov, Czech Republic in Ordovician sediments of the Barrandian area. Allanpringite forms yellow powder and earthy aggregates. In a more detailed study using SEM microscope, allanpringite forms rod-shaped and tabular crystals. Its origin is associated with alteration of fluorwavellite. Empirical formula of the allanprigite is (Fe2.70Al0.24)Σ2.94(PO4)2.00(OH)2.83·5H2O and refined unit-cell parameters are a 9.774(5), b 7.361(3), c 17.826(8) Å, β 92.2(6)° and V 1281.5(9) Å3. Allanpringite was found in association with jarosite, variscite and partly altered fluorwavellite.

Crystal and X-Ray Powder Data for a New Organic Diphosphate [NH3(CH2)2NH3]2·P207

1991 ◽  
Vol 6 (4) ◽  
pp. 228-230
Author(s):  
Slaheddine Kamoun
Keyword(s):  
Powder Diffraction ◽  
Diffraction Data ◽  
Unit Cell ◽  
Monoclinic Space Group ◽  
Powder Diffraction Data ◽  
Metathesis Reaction ◽  
Chemical Preparation ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters

AbstractWith the help of Boulle's metathesis reaction, we have succeeded in preparing the compound [NH3(CH2)2NH3]2·P207. We describe its chemical preparation and main crystallographic features. The bis(ethylenediammonium) diphosphate salt is monoclinic, space group C2/c, with Z = 4. Unit cell parameters and powder diffraction data for this salt are reported.

scholarly journals The crystal structure of alstonite, BaCa(CO3)2: an extraordinary example of ‘hidden’ complex twinning in large single crystals

2020 ◽  
Vol 84 (5) ◽  
pp. 699-704
Author(s):  
Luca Bindi ◽  
Andrew C. Roberts ◽  
Cristian Biagioni
Keyword(s):  
Crystal Structure ◽  
Single Crystals ◽  
Structure Determination ◽  
Unit Cell ◽  
Crystal Structure Determination ◽  
Unit Cell Parameters ◽  
Space Group ◽  
Cell Parameters ◽  
Structure Determinations

AbstractAlstonite, BaCa(CO3)2, is a mineral described almost two centuries ago. It is widespread in Nature and forms magnificent cm-sized crystals. Notwithstanding, its crystal structure was still unknown. Here, we report the crystal-structure determination of the mineral and discuss it in relationship to other polymorphs of BaCa(CO3)2. Alstonite is trigonal, space group P31m, with unit-cell parameters a = 17.4360(6), c = 6.1295(2) Å, V = 1613.80(9) Å3 and Z = 12. The crystal structure was solved and refined to R1 = 0.0727 on the basis of 4515 reflections with Fo > 4σ(Fo) and 195 refined parameters. Alstonite is formed by the alternation, along c, of Ba-dominant and Ca-dominant layers, separated by CO3 groups parallel to {0001}. The main take-home message is to show that not all structure determinations of minerals/compounds can be solved routinely. Some crystals, even large ones displaying excellent diffraction quality, can be twinned in complex ways, thus making their study a crystallographic challenge.

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