Epidote (Var: Tawmawite) : {Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)

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minID: 690-HL4

Epidote (Var: Tawmawite) : {Ca2}{(Al,Fe3+,Cr)3}(Si2O7)(SiO4)O(OH)

This image is copyrighted. Unauthorized reproduction prohibited.

This is an outstanding specimen of epidote from tawmaw.

It is the first and still (25.08.2013) the only known specimen with the tawmaw-effect, which i discovered at the 16.08.2013 (see last photo for details!).

But it has several more interesting details. The first is the zoning of the refraction index. You can see it clearly on this image. The crystal seems to have diagonal cracks, but this is just some kind of fata morgana, which is caused by extreme differences of the refraction index.

The zoning is extremely fine. If you look on full resolution, you can see it way better. But in reality, this zoning consits even of much more and thiner lines. This is the oscillatory zoning.

This crystal has also visible sector zoning. The brownish iron rich band in the upper half of the picture is this sector zoning.

Length of longest crystal side is 3 centimeters.

This photo has been shown 935 times
Photo added:25th Aug 2013
Dimensions:1525x748px (1.14 megapixels)
Date/Time of Photo:25th Aug 2013 12:13:16
Camera:CANON EOS 350D / Digital Rebel XT / Kiss Digital N
Exposure time:1/400s
Focal Length:55mm
ISO speed:400

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