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" A twin-crystal is composed of two crystals joined together in such a manner " that one would come into the position of the other by revolving through two right " angles round an axis which is perpendicular to a plane which either is, or may be, " a face... "
An Elementary Introduction to Mineralogy - Page 45
by William Phillips - 1852 - 700 pages
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A Treatise on Crystallography

William Hallowes Miller - 1839 - 190 pages
...parallel to the faces r/, r' of the other. The places of r, r are interchanged, and one crystal comes into the position of the other by revolving through two right angles round a normal to a face of {ii T}, the pole of which bisects the arc joining the poles of r, r'. Hence the...
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Orr's Circle of the Sciences: Inorganic nature] Geology, mineralogy, and ...

William Somerville Orr - 1855 - 608 pages
...TWIN CRYSTALS. Л Twin Crystal, or Mack C'rys/ч/, is composed of two crystals, or similar portions of two crystals joined together in such a manner that one would come into the position Fl Fig. 301. Fig. 359. Fig. 3«fl. of the other by revolving through two right angles round an axis...
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Mineralogy and Crystallography: Being a Classification of Crystals ...

James Tennant, Walter Mitchell - 1860 - 302 pages
...TWIN CRYSTALS. A Twin Ortfsin!, or Macle Crystal, is composed of two crystals, or similar portions of two crystals joined together in such a manner that one would come into the position ' Kg. 359.' Fig. 360. of the other by revolving through two right angles round an axis which is perpendicular...
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A Tract on Crystallography: Designed for the Use of Students in the University

W. H. Miller - 1863 - 104 pages
...BF, or the angular elements of the crystal. CHAPTER VIII. TWIN CRYSTALS. 183. A TWIN crystal consists of two crystals joined together in such a manner,...by revolving through two right angles round an axis which is either normal to a possible face, or parallel to the axis of a possible zone, of each of the...
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The Molecular Tactics of a Crystal

William Thomson Baron Kelvin - 1894 - 74 pages
...intersection of these two planes, we bring it into perfect coincidence with the other part. 1 'A twin-crystal is composed of two crystals joined together in such...by revolving through two right angles round an axis which is perpendicular to a plane which either is, or may be, a face of either crystal. The axis will...
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Baltimore Lectures on Molecular Dynamics and the Wave Theory of Light

William Thomson Baron Kelvin - 1904 - 848 pages
...successive layer might be the wider hollows p'q'r' : and therefore if, from a single * "A twin-crystal is composed of two crystals joined together in such...revolving through two right " angles round an axis which is perpendicular to a plane which either is, or may be, " a face of either crystal. The axis...
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Baltimore Lectures on Molecular Dynamics and the Wave Theory of Light ...

William Thomson Baron Kelvin - 1904 - 734 pages
...therefore if, from a single * " A twin-crystal is composed of two crystals joined together in suck a manner " that one would come into the position of the other by revolving through two right " angle* round an axis which is perpendicular to a plane which either is, or may be, •• a (ace...
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Baltimore Lectures on Molecular Dynamics and the Wave Theory of Light

Lord William Thomson Kelvin - 1904 - 732 pages
...successive layer might be the wider hollows p'q'r' : and therefore if, from a single * " A twin-crystal is composed of two crystals joined together in such...revolving through two right " angles round an axis which is perpendicular to a plane which either is, or may be, " a face of either crystal. The axis...
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