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  • 1
    Electronic Resource
    Electronic Resource
    Etude des défauts dans des monocristaux naturels de béryl. I. Observations des dislocations (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 12 (1979), S. 70-77 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: The lattice defects of beryl single crystals from Brazil and Madagascar have been studied by X-ray topography. Two types of linear defects are observed: channels and grown-in dislocations. Slip systems and Burgers-vector moduli are determined. Some calculations of directions of minimum dislocation energy are given and they are in quite good agreement with the observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889879011808
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  • 2
    Electronic Resource
    Electronic Resource
    Growth defects in quartz druses, 〈a〉 pseudo-basal dislocations (1985)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 18 (1985), S. 275-278 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Growth defects were studied by X-ray topography in a succession of plates cut parallel to the basal planes of two quartz crystals from an Italian druse (Rocca dei Cristalli, Val Malenco, Italy). Growth bands, dislocations and precipitates are the dominant defects. Defect configurations, Burgers vectors and orientations of line defects were found to be similar in both crystals. Distinctive growth marks characterize the growth history of the druse: in particular, characterization was made of unreported dislocations with 〈a〉 Burgers vectors, whose line orientations deviate from the basal plane by an angle of about 10°. These dislocations, referred to here as pseudo-basal dislocations (p.b.d.), were found to be perpendicular to the x {51{\bar 6}1} faces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889885010330
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  • 3
    Electronic Resource
    Electronic Resource
    Etude des défauts dans des monocristaux naturels de topaze. II. Etude de genèse (1975)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 8 (1975), S. 315-324 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Two samples of monocrystal topaz from Nigeria and Brazil are studied by X-ray topography. The plates are obtained by cleavage and in both growth bands are observed. These bands are parallel to the different faces of the morphology and are grouped in sectors. The limits between two adjacent growth sectors induce more or less misorientation. Observations of topographs allow the reconstruction of different stages of crystal growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889875010515
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  • 4
    Electronic Resource
    Electronic Resource
    Etude des défauts dans des monocristaux naturels de béryl. II. Etude de croissance (1979)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 12 (1979), S. 78-83 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Growth defects in natural single crystals of beryl have been examined by X-ray topography. The distribution and the configuration of the defects: dislocations, channels, growth bands and growth sector boundaries, are related to the development of the crystals in nature. For some Brazilian samples, characteristic stops and starts during their development and dissolution phenomena have revealed similar conditions of growth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188987901181X
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  • 5
    Electronic Resource
    Electronic Resource
    Sur l'origine des canaux dans les cristaux (1982)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 15 (1982), S. 417-422 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Channels in natural and synthetic crystals have been studied by optical microscopy, X-ray topography and contrast calculations. The optical and topographic contrasts suggest that some channels have been created from preexisting dislocation groups. Computer calculations of the diffraction contrast of dislocations demonstrate the matching between contrast and strain origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889882012291
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  • 6
    Electronic Resource
    Electronic Resource
    Growth of a beryl single crystal–history of the development and the genetic medium (1981)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 14 (1981), S. 241-246 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Growth defects in a natural Brazilian single-crystal of beryl have been studied by X-ray topography, optical microscopy and electron microprobe. The distribution and configuration of channels and dislocations are both very different from those previously observed in other crystals and can be correlated with a `horseshoe' growth in a pegmatic medium. This was confirmed by the analysis of inclusions which allowed us to estimate the limits of temperature and pressure ranges in the genetic medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S002188988100928X
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  • 7
    Electronic Resource
    Electronic Resource
    Growth defects in a quartz druse 〈a+c〉 dislocations (1983)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 16 (1983), S. 399-403 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Growth defects have been studied by X-ray topography in two natural quartz crystals from a Brasilian druse. Different types of defects have been observed and they showed similar configuration in both samples. Dislocations are analyzed and discussed. In particular, `pyramidal' dislocations with (a +c) Burgers vectors have been characterized: these uncommon dislocations are analyzed in detail because even today they are believed to be nucleated only by deformation processes. The observations, taken as a whole, indicate that defects of crystals from a druse present distinctive characteristics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889883010687
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  • 8
    Electronic Resource
    Electronic Resource
    Determination of supersaturation conditions in the GaSe iodine growth by etch-pit examination
    Amsterdam : Elsevier
    Journal of Crystal Growth 29 (1975), S. 373-381 
    Details
    ISSN: 0022-0248
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0248(75)90185-2
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  • 9
    Electronic Resource
    Electronic Resource
    Transmission electron microscopic study of experimentally deformed k-feldspar single crystals (1983)
    Springer
    Physics and chemistry of minerals 9 (1983), S. 182-187 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract A set of sanidine single crystals were previously deformed at 700° C in a Griggs triaxial press with different crystallographic orientations of the core so as to induce dislocation glide of different slip systems respectively. Deformed crystals have been studied by transmission electron microscopy (TEM) and the activated slip systems have been characterized for two orientations. (010)[001] and (001)1/2[ $$\overline 1 $$ 10] systems expected for one orientation (main stress nearly parallel to [012]) are observed, whereas the (001)[100] system expected for the other orientation (main stress nearly parallel to [101]) is never observed. In the latter specimen the deformation is rather difficult and occurs through unexpected systems characterized as (110)1/2[1 $$\overline 1 $$ 2] and (1 $$\overline 1 $$ 1)1/2[110]. In all the samples studied the deformation is heterogeneous, exhibiting dislocation configurations related to temperature variations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308376
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  • 10
    Electronic Resource
    Electronic Resource
    Optical anomalies of beryl crystals (1984)
    Springer
    Physics and chemistry of minerals 11 (1984), S. 60-66 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Basal plates of natural beryls were studied by optical microscope, X-ray topography, and electron microprobe analysis. Optical anomalies were found to depend on growth history and on variation of impurity content: in particular optical axial plane orientations and 2V values were found to depend on minor element concentration differences in growth sectors. Knowledge of growth history of minerals can now make possible the differentiation between primary and secondary optical anomalies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308006
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