Columbite-tantalite inclusions in aquamarine

Weight: 6.30 ct
Size: 16.7 x 7.2 x 6.4 mm


Color: brown inclusions in light blue aquamarine
Cut: rectangular, step cut (baguette)
Origin: Pakistan
Comment: Scanning Electron Microscopy (SEM) confirmed inclusion identification of columbite-tantalite, forming dark brownish needles and often fan and star shapes. Colorless crystals included in the same aquamarine samples were identified by SEM as albite.





Rough mateial:

Columbite-tantalite in quartz rough