Dunilite

Named in 2004 after D.P. Gunasekara, who first found the gem-mineral in Sri Lanka. Dunilite is a rare stone, Normally facet grade stones are under 0.5ct

Borosilicate. Analysis (wt%): SiO₂, 33.92; Al₂O₃, 61.15; K₂O, 0.92; TiO₂, 4.01.
Boron not detected.
The structure is closely related to dumortierite but with extensive substitution of Si by Ti
Hardness = 7½.
SG: 3.46. RI: ά = 1.700, β = 1.720, γ = 1.730,
Birefringence = 0.030 Biaxial (-).
Pleochroism = strong.
Light cinnmon brown/reddish clove brown/violetish brown.
Steak = purple white.
Cleavage = perfect to one direction. Uneven fracture.
Microscope features: parallel rutile needles, tiny black crystals, and liquid feathers.

Displaying 1 to 9 (of 9 products)

Product Image	Item Name-	Price
	0.05 ct Dunilite S03526 Item Name : Dunlite Item Number : S03526 Weight : 0.05 ct Dimension : 2.8 x 2 mm Cut : Step Cut Origin : Sri Lanka Shape : Oval Color...	$30.00
	0.08 ct Dunilite S03524 Item Name : Dunlite Item Number : S03524 Weight : 0.08 ct Dimension : 3.1 x 2.7 mm Cut : Step Cut Origin : Sri Lanka Shape : Oval...	$30.00
	0.12 ct Dunilite S03522 Item Name : Dunlite Item Number : S03522 Weight : 0.12 ct Dimension : 3 x 3 mm Cut :Diamond cut Origin : Sri Lanka Shape : Round...	$50.00
	0.13 ct Dunilite S03525 Item Name : Dunlite Item Number : S03525 Weight : 0.13 ct Dimension : 3.4 x 2.9 mm Cut :Diamond cut Origin : Sri Lanka Shape :Oval...	$50.00
	0.17 ct Dunilite S03518 Item Name : Dunlite Item Number : S03518 Weight : 0.17 ct Dimension : 4.2 x 2.2 mm Cut : Portuguese cut Origin : Sri Lanka Shape : Oval Color...	$30.00
	0.20 ct Dunilite S03519 Item Name : Dunlite Item Number : S03519 Weight : 0.20 ct Dimension : 4 x 4 mm Cut : Step Cut Origin : Sri Lanka Shape : Round Color :...	$30.00
	0.22 ct Dunilite S03517 Item Name : Dunlite Item Number : S03517 Weight : 0.22 ct Dimension : 4.1 x 3.4 mm Cut : Step Cut Origin : Sri Lanka Shape : Oval...	$30.00
	0.27 ct Dunilite S03520 Item Name : Dunlite Item Number : S03520 Weight : 0.27 ct Dimension : 4.6 x 3.1 mm Cut : Step Cut Origin : Sri Lanka Shape : Oval...	$30.00
	Natural Dunilite Crystal S03439 Item Name : Dunlite crystal Item Number : S03439 Weight : 48.94 ct Dimension : 32 x 20 x 10mm Shape : Crystal Color : Deep brown Treatment :...	$350.00