XIII. On the origin of the crystalline forms of the Haytorite
XIII. On the origin of the crystalline forms of the Haytorite
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十三．
DOI：
10.1080/14786442708674205
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发表时间：
--
影响因子：
1.6
通讯作者：
A. Levy
中科院分区：
文献类型：
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作者：
A. Levy
M R. W.菲利普斯非常友好地把他在前一篇论文中给出的黑托石晶体的图纸和测量结果告诉了我，我首先检查了是否通过取足够数量的观察到的角度作为数据来确定可以被假定为原始的最简单形式的尺寸，其他观察到的入射角确实与简单递减的计算结果一致。因为如果不是这样的话（毫无疑问，观察的准确性是可以接受的），那么在假设这些晶体是假晶的情况下，它们就不会精确地保持它们所模仿的物质的角度。因此，在它们提供的偶然性和任何矿物的偶然性之间，不能期望有完全一致的结果;同时也很难断定它们所取代的物质是什么，因为它们的形状与结晶的物质相似，角度也相差不大，这就足以使它们很可能是它的假晶。如果观察到的角和计算出的角相等，那么就会得出与上述完全相反的推论。现在，和仅仅检查的整体测量Haytorite证明，我们可以假设为原始形式的斜菱形棱柱，其侧面将对应于平面g~，和基地的平面m（见图在前面的文件）;这个基地是倾斜的侧面在一个角度非常沟通的作者。G~ little
M R. w. PHILLIPS having been so good as to commu-nicate to me the drawings and measurements of the crystals of Haytorite he has given in the preceding paper, I first examined whether by taking a sufficient number of the observed angles as data to detei~ mine the dimensions of the simplest form which may be assumed as the primitive, the other observed incidences did agree with the results of calculation of simple decrements. Because if that was not the case (as no doubt can be entertained on the accuracy of the observations) it would follow, in the supposition of these crystals being pseudomorphic, that they had not preserved exactly the angles of the substance upon which they had been modelled. Consequently no perfect agreement could be expected between the incidences they afford, and those of any mineral; and at the same time that it would make it difficult to decide which was the substance they had replaced, a similarity of their forms, and not too wide a difference of their angles, with those of a crystallized species, would be sufficient to make it probable that they were pseudomorphic crystals of it. Inferences entirely opposite to the preceding would be drawn, if the equality between the observed and calculated angles should obtain.Now the forms, and mere inspection of the ensemble of the measurements of Haytorite prove, that we may assume for the primitive form an oblique rhombic prism, the lateral planes of which would correspond to the planes g~, and the base to the plane m (See the figures in the preceding paper); this base being inclined upon the lateral planes at an angle very Communicated by the Author. G~ little