File:The Quarterly journal of the Geological Society of London (12682960265).jpg

From Wikimedia Commons, the free media repository
Jump to navigation Jump to search

Original file ‎(1,247 × 2,106 pixels, file size: 509 KB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary[edit]

Description

142
PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Jan. 23,
space I shall confine my remarks. The section is not drawn accu-
rately to a scale, but it is about ^ inch to the fathom.
Starting from the western trap-vein, which is situated in schistose
gneiss and hornblende-schist, we find the gneiss gradually losing its
slaty structure, until in the neighbourhood of the cryolite it becomes
granitic, and now contains numerous metallic traces ; before arriving
at the cryolite, we find a wide vein of white quartz and felspar, run-
ning about S.W. ; the quartz and felspar are in very large masses
and crystals, some crystals of quartz measuring a foot in thickness.
This rock is traversed in several directions by small veins and masses
of cryolite, isolated from the larger body of that mineral, in
which, as well as in the rock, are to be found numerous crystals of a
variety of tantalite, oxide of tin, blende, molybdenum, much galena,
copper-pyrites, arsenical and iron-pyrites, and sparry iron-ore. In
this rock are many small caverns, arising from the decomposition of
the felspar, and probably also from the decomposition of the cryo-
lite, which is here porphyritic, containing crystals of felspar and
quartz. The floors of these caverns are covered with loose crystals
and fragments of felspar, and in some places kaolin, crystals of tin-
stone, and carbonate of iron. In one of these cavities is a large vein
of arsenical pyrites and purple fluor-spar ; also a large vein of black
cryolite, containing copper- and iron-pyrites, and red felspar. Smaller
cavities are found when blasting, the sides of which are completely
covered with crystals of the tantalite, resembling on a large scale
Fig. 2. — Transverse Section of the Cryolite at Evigtok»
(The width of the Cryohte is about 80 feet.)
S. N.
9^9-
i.
9-
I.
/.
Gneiss.
Sparry iron-ore.
Quarts-vein.
Argentiferous galena.
Purple fluor-spar.
Black Cryolite.
pi, pL
Galena, copper-pyrites, blende,
iron-pyrites, and carbonate of
iron scattered in cryolite.
Fragment of cryolite was found
imbedded at this spot.
the crystalline cavities in amygdaloidal traps. In this quartz- and
felspar-rock there is a remarkable vein, containing soft ferruginous
clay and rolled pebbles, sparry iron-ore, and copper-pyrites. The

copper lies over the sparry iron, and runs in fine threads between the
Date
Source https://www.flickr.com/photos/biodivlibrary/12682960265
Author Geological Society of London
Full title
InfoField
The Quarterly journal of the Geological Society of London.
Page ID
InfoField
35338579
Item ID
InfoField
109655 (Find related Wikimedia Commons images)
Title ID
InfoField
51125
Page numbers
InfoField
Page 142
BHL Page URL
InfoField
https://www.biodiversitylibrary.org/page/35338579
Page type
InfoField
Text
Flickr sets
InfoField
  • The Quarterly journal of the Geological Society of London. v. 12 (1856).
Flickr tags
InfoField
Flickr posted date
InfoField
21 February 2014
Credit
InfoField
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.

العربية ∙ বাংলা ∙ Deutsch ∙ English ∙ español ∙ français ∙ italiano ∙ 日本語 ∙ македонски ∙ Nederlands ∙ polski ∙ +/−

The categories of this image need checking. You can do so here.
  • Please remove redundant categories and try to put this image in the most specific category/categories.
  • You can remove this template by clicking here (or on the first line).



Licensing[edit]

w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by BioDivLibrary at https://flickr.com/photos/61021753@N02/12682960265. It was reviewed on 27 August 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

27 August 2015

This image is in the public domain because it is a mere mechanical scan or photocopy of a public domain original, or – from the available evidence – is so similar to such a scan or photocopy that no copyright protection can be expected to arise. The original itself is in the public domain for the following reason:
Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

This tag is designed for use where there may be a need to assert that any enhancements (eg brightness, contrast, colour-matching, sharpening) are in themselves insufficiently creative to generate a new copyright. It can be used where it is unknown whether any enhancements have been made, as well as when the enhancements are clear but insufficient. For known raw unenhanced scans you can use an appropriate {{PD-old}} tag instead. For usage, see Commons:When to use the PD-scan tag.

Note: This tag applies to scans and photocopies only. For photographs of public domain originals taken from afar, {{PD-Art}} may be applicable. See Commons:When to use the PD-Art tag.

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current21:32, 26 August 2015Thumbnail for version as of 21:32, 26 August 20151,247 × 2,106 (509 KB)Fæ (talk | contribs)== {{int:filedesc}} == {{BHL | title = The Quarterly journal of the Geological Society of London. | source = http://www.flickr.com/photos/biodivlibrary/12682960265 | description = 142 <br> PROCEEDINGS OF THE GEOLOGICAL SOCIETY. .Jan. 23, <br> space I s...

You cannot overwrite this file.

There are no pages that use this file.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:The_Quarterly_journal_of_the_Geological_Society_of_London_(12682960265).jpg&oldid=643143190"