The Edinburgh New Philosophical Journal
Format: Paperback
ISBN13: 9780217280839
Paperback|9780217280839
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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: On the Chemical Composition of some Norwegian Minerals. By David Forbes, F.G.S., A.I.C.E., F.C.S. Part II. III. Yttrotitanite or Keilhauite. Since the publication of the first part of this communication, I have received a letter from Professor Miller of Cambridge, which contains some remarks on the crystalline form of this mineral, and of which, by his kind permission, I am enabled to communicate an abstract.? Your analysis shows that Keilhauite is a Sphene, but you have not noticed that its form, aa well as it can be made out Fig. 1. by observations with the hand goniometer, is the same as that of Sphene. Fig. 1. is your Fig. 4, with the faces marked with the same letters as the faces of sphene in the new edition of W. Phillips. The first column of the following table contains the angles between normals to the faces of Keilhauite. The second column contains the corresponding angles in spheue. The first six angles are those given by observation, the next from the angles computed by M. Hansteen. Your a is, I suppose, the same, as 'yh.' The twins are the same as the ordinary twins of sphene. re It vc yo n r yn iy t r n c fy yh I do not exactly understand the position of the cleavage planeji, as the angles they make with any other plane are notgiven. In sphene, the cleavages are parallel to the faces r, c, I, the angles between normals to two faces 11' is 133 58. Keilhauite.Sphene.33 ff 33 16'31 0294555 0533458 0602726 30271536 30382439 18404044 49446636 2635765 356539122 012054With reference to the cleavage planes, the two best observed planes appear to correspond to r and c; and in one specimen a cleavage plane corresponding apparently to I was noticed. The blowpipe reactions of this mineral are the same as sphene. It is, howev...
| ISBN-13 | 9780217280839 |
|---|---|
| ISBN-10 | 0217280838 |
| Weight | 1.09 Pounds |
| Dimensions | 9.00 x 6.00 x 0.75 In |
| List Price | $23.74 |
| Format | Paperback |
|---|---|
| Pages | 336 pages |
| Publisher | |
| Published On | 2009-08-01 |
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