Inclusions:Spinel

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SP0811xx1a.jpg

Spinel inclusion in spinel (80 micron in size)
Photo by John Huff, gemcollections.com


SP0810hff6au.jpg

Octahedral ( spinel ) crystal with stress fractures/ halo which give such inclusions the "flying pyramid" appearance.
Photo by John Huff, gemcollections.com