P365 Aug24: More gems

Here are a few more photos of my Dad's mineralogy collection. From top to bottom:

A piece of rough tigereye. Even before it's cut and polished, the golden bands shimmer in the light.
A larger (30mm) pair of amethyst crystals.
This is some dendritic agate. The black dendrite growths extendend into the milky translucent stone, and look almost like little trees in fog. This is a HDR image, assembled from eight seperate images of different exposure, using Photoshop's "merge to HDR". I did this so that the intense backlight showing the dendrites could be seen as well as the dimly lit front. If I had two working flash transmitters, It wouldn't have been as much of an issue :)
Finally this is the same piece of amethyst I showed you the other da, but this time I attempted to backlight it. This image is also HDR to a certain degree, and is made from two seperate exposures manually merged in Photoshop.

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