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Weissenberg photographs

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Journal Article
Published: 01 July 1939
American Mineralogist (1939) 24 (7): 448–451.
... to take Weissenberg layer-line photographs with the rotation axis of the crystal inclined to the incident x -ray beam at an angle equal to that made by the rotation axis with the reflected x -ray beams for the layer-line that is being analyzed, the author has derived the relationship for the rotation...
Image
<span class="search-highlight">Weissenberg</span> <span class="search-highlight">photographs</span> of tobermorite 10 Å: (a)  h 0 l  layer; (b) 0 kl  l...
Published: 01 October 2012
Fig. 3 Weissenberg photographs of tobermorite 10 Å: (a) h 0 l layer; (b) 0 kl layer. Significant reciprocal directions are indicated in white.
Image
Parts of( h O l ) <span class="search-highlight">Weissenberg</span> <span class="search-highlight">photographs</span> for marinellite (a, b) and tounki...
Published: 01 November 2003
Fig. 5. Parts of( h O l ) Weissenberg photographs for marinellite (a, b) and tounkite (c, d). In (a) and (c) the positions of the (400) and (0.0.24) reflections were marked for reference. In the enlarged views, (b) and (d), some noticeable differences in the intensity and shape of the reflections
Journal Article
Published: 01 May 1937
American Mineralogist (1937) 22 (5): 728–730.
... of the Weissenberg x -ray goniometer. Rotation photographs were made around the principal zone-axis, also Weissenberg photographs of the equator and first and second layer-lines. Copper K- and chromium K-radiation was used. The Weissenberg photographs were analyzed graphically by the method of Schneider (1928). New...
Journal Article
Published: 01 February 1954
American Mineralogist (1954) 39 (1-2): 24–29.
...Joseph Murdoch Abstract X -ray study of hydromagnesite crystals confirms the monoclinic character of the mineral, but shows that it is pseudo-orthorhombic in structure. Equator, first and second layer line Weissenberg photographs show that the presently accepted a axis should be doubled. Systematic...
Journal Article
Published: 01 December 1950
American Mineralogist (1950) 35 (11-12): 959–984.
...George Tunell; K. J. Murata Abstract The crystal structure of krennerite has been analyzed by means of Weissenberg photographs and powder diffraction photographs. The dimensions of the unit cell, all determined rcSntgenographically, are a 0 = 16.54 Å, b 0 =8.82 Å, c 0 =4.46 Å, all ±0.03...
Journal Article
Published: 01 August 1941
American Mineralogist (1941) 26 (8): 457–477.
...George Tunell Abstract The crystal structure of sylvanite has been analyzed by means of Weissenberg photographs and powder diffraction photographs. The dimensions of the unit cell, all determined by purely rontgenographic measurements, are a 0 =8.94 Å, b 0 =4.48 Å, c 0 = 14.59 Å, all ± 0.02...
Journal Article
Published: 01 December 1961
American Mineralogist (1961) 46 (11-12): 1504.
...Arrigo Addamiano Abstract The suggestion has been made by Christ (1956) that powder patterns of substances of known cell-dimensions be taken at the edges of Weissenberg photographs to serve as standards for film calibration. In our laboratory we have often used the Weissenberg camera as a “powder...
Image
A  h 0 l  <span class="search-highlight">Weissenberg</span> <span class="search-highlight">photograph</span> of molybdophyllite from Långban (specimen ...
Published: 01 June 2012
F ig . A1. A h 0 l Weissenberg photograph of molybdophyllite from Långban (specimen 19419).
Journal Article
Published: 01 October 1957
American Mineralogist (1957) 42 (9-10): 594–618.
...Deane K. Smith, Jr.; John W. Gruner; William N. Lipscomb Abstract Zero level Weissenberg photographs about the b -axis and 0 kl precession photographs have produced a compatible crystal structure for uranophane. The cell constants are a = 15.97 Å, b = 7.07 Å, c = 6.68 Å, and β = 97.3° with twice...
Journal Article
Published: 01 October 1995
American Mineralogist (1995) 80 (9-10): 1054–1058.
...P. Bonazzi; D. Borrini; F. Mazzi; F. Olmi Abstract The crystal structure of synthetic pääkkönenite, Sb 2.07 As 0.93 S 2.00 , was determined. This study revealed that, in spite of the strong orthorhombic pseudosymmetry shown by Weissenberg photographs, the structure is monoclinic (space group C 2/ m...
Journal Article
Published: 01 December 1987
American Mineralogist (1987) 72 (11-12): 1163–1169.
..., and Weissenberg photographs showed weak, extra six-layer spots. Of the 402 possible six-layer mica structures, only eight have the observed monoclinic symmetry and unit-cell geometry. Stacking arrangement 6M 1 = [1 2 1 1 2 1 ] of space group C2/c , which can be generated by adding a center of symmetry...
Journal Article
Published: 01 April 1982
American Mineralogist (1982) 67 (3-4): 388–393.
...Cesare Sabelli Abstract The search for a crystal suitable for X-ray data collection was laborious, because all the crystals tested were multiple crystals. After many trials a very thin (100) tabular crystal was chosen. Preliminary X-ray Weissenberg photographs showed that it consists of two...
Journal Article
Published: 01 December 1979
American Mineralogist (1979) 64 (11-12): 1265–1271.
...H. E. King; C. T. Prewitt Abstract X-ray diffraction data collected on a single-crystal specimen of CuS 2 show that despite its optical anisotropy CuS 2 apparently has the cubic pyrite structure, with a = 5.7891(6)A. precession and Weissenberg photographs fail to reveal any reflections which...
Journal Article
Published: 01 April 1973
American Mineralogist (1973) 58 (3-4_Part_1): 314–322.
... were measured photometrically on integrated Weissenberg photographs. The main features of the atomic arrangement are: (1) chains formed by SO 4 tetrahedra and Fe(OH) (H 2 O ) 3 O 3 octahedra, (2) isolated octahedra at the origin of the cell, and(3) water molecules not linked directly to cations...
Journal Article
Published: 01 October 1971
American Mineralogist (1971) 56 (9-10): 1553–1566.
...A. Dal Negro; L. Ungaretti; C. Sabelli Abstract Aksaite is a hydrous magnesium borate with chemical formula MgO ·3B 2 O 3 ·5H 2 0. The lattice parameters are: a = 12.540(6), b = 24.327(11), and c = 7.480(3) Å. Space group Pbca , Z = 8. Integrated Weissenberg photographs were taken by using Cu Kα...
Journal Article
Published: 01 August 1971
American Mineralogist (1971) 56 (7-8): 1174–1179.
...G. Giuseppetti; G. Rossi; C. Tadini Abstract Nasonite, Pb 6 Ca 4 (Si 2 O 7 ) 3 Cl 2 , is hexagonal, P 6 3 / m , a 10.08, c 13.27Å, Z 2. Using the 872 hkl intensities measured photometrically from Weissenberg photographs, the structure was determined with the heavy atom method. Least-squares...
Journal Article
Published: 01 June 1970
American Mineralogist (1970) 55 (5-6): 716–728.
...J. J. Finney; Isik Kumbasar; Judith A. Konnert; Joan R. Clark Abstract Howlite, Ca 2 SiB 5 0 9 (OH) 5 , is monoclinic, P 2 1 / c , a = 12.78±0.03, b = 9.33 ± 0.02m c = 8.60 ± 0.02 Å, β = 104.83 ± 0.10“, Z = 4. Using the 1500 hkl intensities estimated visually from Weissenberg photographs...
Journal Article
Published: 01 October 1967
American Mineralogist (1967) 52 (9-10): 1570–1572.
...J. H. Fang; P. D. Robinson; J. F. Cerven; L. A. Wolf Abstract In a recent paper Main and Woolfson (1963) proposed a technique for obtaining accurate lattice parameters from zero-level Weissenberg photographs. The method derives refined cell constants by applying least-squares analysis to α 1 — α 2...
Journal Article
Published: 01 July 1966
American Mineralogist (1966) 51 (7): 1243–1245.
...Paul D. Robinson Abstract When orienting crystals for rotation, oscillation, or Weissenberg photographs, it is frequently desirable to bring a cleavage direction or crystal face—if it is normal to a direct lattice translation—perpendicular to the axis of the goniometer. Where a reflecting...