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III.—Banded and Brecciated Concretions

Published online by Cambridge University Press:  01 May 2009

John Ruskin
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Extract

We have now, I think; obtained sufficient evidence that the disposition of differently coloured or composed bands in agate is in most cases the result of crystalline segregation.We shall find, also, that the order of this segregation is constant under given conditions; and that, with fixed proportions of elements and fixed rate of cooling and drying, the agate will necessarily produce itself in a riband of a fixed succession or pattern of stripes: a spectrum of substances, which, if we had observed data enough, we might read like a spectrum of light; inferring, not the nature of the elements from its bars of colour, but the: former conditions of solution from the bars of elements.

Type
Original Articles
Information
Geological Magazine , Volume 7 , Issue 67 , January 1870 , pp. 10 - 14
Copyright
Copyright © Cambridge University Press 1870

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References

1 I look with extreme interest to the result of the inquiries which Mr. W. Chandler Roberts has undertaken on the chemistry of silica. I hare to thank him already for some most valuable information communicated to me in the course of last year, of which, however, I will venture no statement until he has made public his discoveries in such form as he may think proper.