صورة:USDA Mineral Flourite 93c3962.jpg

Mineral Fluorite

USDA Photo by: Ken Hammond
USDA Image Number: 93cs3962
Source: http://www.usda.gov/oc/photo/93cs3962.htm

This image is a work of a United States Department of Agriculture employee, taken or made during the course of the person's official duties. As a work of the U.S. federal government, the image is in the public domain.

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