Proceedings of the Royal Society of Edinburgh Volume 24 pdf
Proceedings of the Royal Society of Edinburgh Volume 24 pdf
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Author: Royal Society of Edinburgh
Page Count: 184 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: Englishhttps://d39ttiideeq0ys.cloudfront.net/assets/images/book/large/9781/1302/9781130237528.jpg
Format: Pdf
ISBN: 9781130366921
Download Link: Proceedings of the Royal Society of Edinburgh Volume 24
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...appears to be usually c 001. The direction of greatest elongation varies in different crystals, and does not appear to follow any definite law. But elongations parallel to a 100 and to c 001 are commoner than others. The subjoined figures (10 to 17) will illustrate the diversity of habit referred to. Traces of a kind of polysynthetic growth in directions parallel to b 010 are so very general that they may be regarded as of universal occurrence. They remind one of the polysynthetic twinning seen on Albite, and, as a matter of fact, there is nothing to show that they are not really twin laminse. This remark applies to the so-called parallel growths in orthorhombic crystals in general. In addition to this feature of somewhat doubtful nature there is present in nearly all Cerussites a more or less evident tendency to form stellate, aggregates by the twinning of three (? of six) individuals on m 110 as a twinning plane. The angles between any two adjacent brachydiagonal axes does not exactly form a divisor of 360. Hence the compound crystal built up by growth between adjacent individuals always shows re-entrant angles. I have never seen a crystal of Cerussite that did not show some trace of the twinning referred to. See figs. 10-12, 14-16. One remarkable feature connected with these compound Cerussites is that the c face 001 is (or appears to be when studied under a high-power lens) coplanar to all the individuals, no matter what amount of irregularity of growth may characterise the other parts of the crystal. This feature will recall what was stated above in connection with Albite. If these cases stood alone one might pass them by as accidental. But the same features are seen in the case of many other minerals, and they must bo due to some cause which has not a...
Read online Proceedings of the Royal Society of Edinburgh Volume 24 Buy and read online Proceedings of the Royal Society of Edinburgh Volume 24 Download Proceedings of the Royal Society of Edinburgh Volume 24 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Proceedings of the Royal Society of Edinburgh Volume 24
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Proceedings of the Royal Society of Edinburgh Volume 24. Royal Society of Edinburgh
Author: Royal Society of Edinburgh
Page Count: 184 pages
Published Date: 01 Mar 2012
Publisher: Rarebooksclub.com
Publication Country: Miami Fl, United States
Language: Englishhttps://d39ttiideeq0ys.cloudfront.net/assets/images/book/large/9781/1302/9781130237528.jpg
Format: Pdf
ISBN: 9781130366921
Download Link: Proceedings of the Royal Society of Edinburgh Volume 24
---------------------------------------------------------------
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1904 Excerpt: ...appears to be usually c 001. The direction of greatest elongation varies in different crystals, and does not appear to follow any definite law. But elongations parallel to a 100 and to c 001 are commoner than others. The subjoined figures (10 to 17) will illustrate the diversity of habit referred to. Traces of a kind of polysynthetic growth in directions parallel to b 010 are so very general that they may be regarded as of universal occurrence. They remind one of the polysynthetic twinning seen on Albite, and, as a matter of fact, there is nothing to show that they are not really twin laminse. This remark applies to the so-called parallel growths in orthorhombic crystals in general. In addition to this feature of somewhat doubtful nature there is present in nearly all Cerussites a more or less evident tendency to form stellate, aggregates by the twinning of three (? of six) individuals on m 110 as a twinning plane. The angles between any two adjacent brachydiagonal axes does not exactly form a divisor of 360. Hence the compound crystal built up by growth between adjacent individuals always shows re-entrant angles. I have never seen a crystal of Cerussite that did not show some trace of the twinning referred to. See figs. 10-12, 14-16. One remarkable feature connected with these compound Cerussites is that the c face 001 is (or appears to be when studied under a high-power lens) coplanar to all the individuals, no matter what amount of irregularity of growth may characterise the other parts of the crystal. This feature will recall what was stated above in connection with Albite. If these cases stood alone one might pass them by as accidental. But the same features are seen in the case of many other minerals, and they must bo due to some cause which has not a...
Read online Proceedings of the Royal Society of Edinburgh Volume 24 Buy and read online Proceedings of the Royal Society of Edinburgh Volume 24 Download Proceedings of the Royal Society of Edinburgh Volume 24 for pc, mac, kindle, readers Download to iPad/iPhone/iOS, B&N nook Proceedings of the Royal Society of Edinburgh Volume 24
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