Sectorial color zoning in quartz

Weight: 9.44 ct
Size: 19.4 x 12.6 x 4.1 mm


Unusual color distribution in quartz crystal cut perpendicularly to the C axis of the crystal.
Central part of smoky quartz has triangular form, corresponding to rhombohedron faces, while outside citrine rim correspond to trigonal prism growth sectors.
Interesting sample for gems collectors!

Cut: polished slice
Origin: Brazil