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Notes on Crystallites

Published online by Cambridge University Press:  14 March 2018

Frank Rutley
Frank Rutley*
Affiliation:
Royal College of Science, London
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Extract

The work of tile late Hermann Vogelsang, and the subsequent researches of O. Lehmann and other observers, have done much to show that a careful study of the rudimentary forms of crystallisation may prove as valuable to the mineralogist as that of embryology has already been to the comparative anatomist.

It is, indeed, difficult to form any clear conception of the manner in which a crystallite originated, nor can we go further back in the history of its development than a stage in which a number of atoms have been grouped in an arrangement about which there is yet no certainty, thus forming molecules grouped in some manner about which we are equally uncertain. We can but imagine that there is some inherent property in molecules which causes them, under given conditions, to group themselves in an orderly manner and to assume a form which may, when more fully developed, be referred to one of the recognlsed crystallographic systems.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 9 , Issue 44 , December 1891 , pp. 261 - 271
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1891

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References

page 262 note 1 2nd Ed. Yol, I, p. 28,

page 265 note 1 This is a diagrammatic figure. These growths are frequently irregular. They sometimes oocur as mere arborescent growths, as in Fig. 35, and are then barely recognisable as scopulites.

page 265 note 1 Forms of this kind are described by Krukenberg as chiasmolites. “ Mikrographia der Orlasbasalte von Hawaii.” Tubingen, 1877.

page 266 note 1 In hemihedral forms, however, only two main ribs would be present.

page 266 note 2 The forms which I have here termed arculites and furculiles were named chiasmolites by Krukunberg, and I have in consequence applied the name to the group or stage in which they occur.

page 267 note 1 The curved stems of these forms appear at times to consist of losgotites, so grouped that they overlap like tiles on a roof (Fig. 31). See Explanation of Plate.

page 267 note 2 When this paper was read the term biconcave-discolite was employed. Since) however, Prof. Judd objected to the term on the ground that it was already used to designate certain microscopic bodies occurring in calcareous deep-sea deposits, the name rotnlite has been substituted.

page 268 note 1 “ Anniversary Address, Geological Society.” By Prof. T. G, Bonney, 1885. Pruc. Royal Soc. Vol. 39, p. 90. Herman and Rutley, 18S5.