File:Collinsite Phosphorite diagram.jpg

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Summary

Description
English: A diagram of a phosphorite nodule from near François Lake, British Columbia. At the center is andesite, surrounded by layers of the mineral collinsite and the improperly classified mineral quercyite. The outermost layer is wurtzilite. The caption reads "Figure 1. Structure of the phosphate nodules, François Lake, B.C. (Natural size.)"
Date
Source Poitevin, Eugene (July 21, 1927). "A new Canadian occurrence of phosphorite from near Francois Lake, British Columbia" (PDF). Bulletin 46: 4. Canada Department of Mines, Geological Survey.
Author Eugene Poitevin

Licensing

Public domain
This Canadian work is in the public domain in Canada because its copyright has expired due to one of the following:
1. it was subject to Crown copyright and was first published more than 50 years ago, or

it was not subject to Crown copyright, and

2. it is a photograph that was created prior to January 1, 1949, or
3. the creator died prior to January 1, 1972.

You must also include a United States public domain tag to indicate why this work is in the public domain in the United States. Note that this work might not be in the public domain in countries that do not apply the rule of the shorter term and have copyright terms longer than life of the author plus 50 years. In particular, Mexico is 100 years, Jamaica is 95 years, Colombia is 80 years, Guatemala and Samoa are 75 years, Switzerland and the United States are 70 years, and Venezuela is 60 years.

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11 August 2012

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current23:55, 11 August 2012Thumbnail for version as of 23:55, 11 August 20121,226 × 742 (179 KB)Chris857
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