File:The Quarterly journal of the Geological Society of London (12471124015).jpg

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1865..
WALLACE — FLOS FERRI.
415
semitransparent, and beautiful*, the occurrence of the branched arra-
gonite is very rare. I have not heard of more than four or five caverns
in which it has been found, except in small pieces. In the Nent-
head mines stalactites are never found except near the surface, or
in the old works.
Two of these caverns have come under my notice. One of them
in a north vein of the Silver Band Mine, where the Great Limestone
forms its walls. The vein is not strong. On the north side of a
short portion the limestone was flatted for a few feet from the vein.
The flats contained lead-ore and other minerals, all of them much
decomposed. Nearly all the sulphide of lead was changed into car-
bonate, and the round lumps of carbonate, mingled with the oxides
of iron, had not unfrequently crumbled into small particles, having
the appearance of fine sand of a light-brown colour. Only a few
fathoms west from where the arragonite was found, the vein and fiat
are filled chiefly with impure barytes not much affected by the de-
composing agents. The cross section (fig. 1) wiU enable me to de-
scribe more clearly the phenomena connected with the cavern.
Fig. 1. — Section of a Cavern in the Silver Band Mine.
1. I .3. Great Limestone.
That part of the cavern marked a Avas filled wdth rubbish and
pieces of sandstone ; without doubt the latter had fallen through the

  • The transparent stalactites exhibit double refraction.
2 F 2
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Source https://www.flickr.com/photos/biodivlibrary/12471124015
Author Geological Society of London
Full title
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The Quarterly journal of the Geological Society of London.
Page ID
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34892089
Item ID
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108495 (Find related Wikimedia Commons images)
Title ID
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51125
Page numbers
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Page 415
Names
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NameFound:Flos NameConfirmed:Flos EOLID:32842 NameBankID:3001797
BHL Page URL
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https://www.biodiversitylibrary.org/page/34892089
Page type
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Text
Flickr sets
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  • The Quarterly journal of the Geological Society of London. v. 21 (1865)
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Flickr posted date
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12 February 2014
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This file comes from the Biodiversity Heritage Library.

This tag does not indicate the copyright status of the attached work. A normal copyright tag is still required. See Commons:Licensing.

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27 August 2015

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Date/TimeThumbnailDimensionsUserComment
current10:01, 12 October 2021Thumbnail for version as of 10:01, 12 October 20211,880 × 3,200 (1.43 MB)SteinsplitterBot (talk | contribs)Bot: Image rotated by 270°
23:39, 26 August 2015Thumbnail for version as of 23:39, 26 August 20153,200 × 1,880 (1.44 MB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/12471124015 | description = 1865.. <br> WALLACE — FLOS FERRI. <br> 415 <br> semitransparent, and b...

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