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Banded Fluorite
An example of the element Calcium

Sample Image
Calcium Banded Fluorite
Banded Fluorite.
The tag that came with sample reads as follows:
Banded Fluorite, Sierra County, New Mexico
This specimen was found in the steep section of tailings of an abandoned mine. Also included with some specimens are quartz, barite, granite and/or jasper. It fluoresces a nice vibrant purplish blue in both short & long wave ultra-violet light.
I traded this sample for a few of my strange copper nodules.
Source: Calvin Webb
Contributor: Calvin Webb
Acquired: 1 September, 2003
Price: Donated
Size: 1"
Composition: CaF2
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