Dumortierite Value, Price, and Jewelry Information
Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon material is the only generally known form, since faceted stones are so rare. Fibrous inclusions have been noted in the transparent Brazilian stones.
See also: Holtite.
Optics: a = 1.686; β = 1.722;γ = 1.723.
Brazil: a = 1.668-1.673; β= 1.682-1.684; γ= 1.685-1.688. SG = 3.31-3.35.
Uniaxial (-), 2V= 13-56°.
Occurrence: In aluminous metamorphic rocks; in pegmatites.
Pershing County, Nevada: violet gem material. Arizona.
France; Madagascar; Brazil (Minas Gerais): facetable bluish-green material.
Sri Lanka: transparent, reddish-brown stones.
Comments: Dumortierite is a beautiful and very hard material, eminently suitable for jewelry. The cabochon material is the only generally known form, since faceted stones are so rare. Fibrous inclusions have been noted in the transparent Brazilian stones.
Name: After M. Eugene Dumortier, a paleontologist.
