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III.—On Banded and Brecciated Concretions

Published online by Cambridge University Press:  01 May 2009

John Ruskin
John Ruskin
Affiliation:
Denmark Hill.
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Extract

The next group of agates which I have to describe belongs to the nested series; but is distinguished from all other varieties of that series by having a pure chalcedonic surface (unaffected, except in the form of it, by the material of its gangue); and by uniformity of colour; consisting only of white and transparent grey bands, wholly untinged by more splendid colours. But nearly all the agates of this group which now occur in the market have been dyed brown or black at Oberstein, to the complete destruction of their loveliest phenomena.

Type
Original Articles
Information
Geological Magazine , Volume 5 , Issue 47 , May 1868 , pp. 208 - 213
Copyright
Copyright © Cambridge University Press 1868

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References

page 209 note 1 In Plate XIII. Fig. 1 shows the clothes-line arrangement in pure surface-section, and Fig. 2 in perspective, seen through the transparent stone, the edges only of the pandant veils being at the surface. Of the tented arrangement I will give examples in succeeding plates, but they are not specifically different arrangements; they are only accidental variations in the direction of the interrupting masses.

page 211 note 1 Magnified about three times.