Origin unknown. Corundum. Verified via hardness test. In a parcel of unheated stones but this is the only one that has the unusual inclusions. Here's a photo of subject stone.
Here is a picture of some similar dendrites. https://www.researchgate.net/profile/Ha ... artial.png Fast growth favors dendritic crystallization, but the high surface area to volume ratio is not thermodynamically favorable, so if those dendrites are sitting in a hot solution for a while after initial crystallization those really fine crystals on the outside are going to dissolve and be redeposited, which will round out those shapes and break them up into isolated bits. I have a video of this process happening here: http://www.youtube.com/watch?v=V3Wcs1VRzaU
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