Dumortierite

Dumortierite is a natural aluminium borosilicate mineral that usually occurs as massive, fibrous or granular material in blue, violet-blue, pink or reddish brown. Massive blue and violet dumortierite is cut into cabochons and beads, while transparent faceted stones are very rare. It is a distinct mineral and should not be confused with dumortierite quartz, quartz rock coloured by dumortierite.

Bracelet works with this material

Shared designs that use at least one piece of this material. Open one to see its pieces, buy them loose or copy it into your own designs.

Showing the newest 60 of 178 works. See all designs

Loose materials of this stone marked Work

Traditional meaning: Work

Only this stone’s materials that Pascle’s data marks with Work are listed, not every material of the stone.

Back to Work View all products of this stone
Category
Category
Color
Color

Colors are read from each product’s main photo; Multicolor means three or more colors.

Bead diameter (mm)
Bead diameter (mm)

Only round beads with a verified diameter. A product matches when its stated size range overlaps yours, limits included; a material matches when any of its round sizes does.

Price (USD)
Price (USD)
Availability

Showing 1 of 1 products

Dumortierite
Dumortierite

4mm / 6mm / 8mm / 10mm

$9.99 Available

Full material guide
Material facts

What the material is, where it comes from or how it is made, identification and care, from the cited sources.

Properties

Nature Natural mineral
Chemical formula Al(Al₂O)(Al₂O)₂(SiO₄)₃(BO₃)
Color Blue, greenish blue, violet-blue, pale blue, pink, red; also brown
Crystal system Orthorhombic; crystals rare, usually massive, fibrous or granular
Mohs hardness 7 to 8 (crystals up to 8.5; massive material about 7)
Specific gravity 3.21 to 3.41
Refractive index 1.659 to 1.692
Birefringence 0.014 to 0.027
Pleochroism Strong (deep blue or violet / yellow to red-violet or nearly colourless / colourless or very pale blue)
Luster Vitreous to dull

Origins & sources

Dumortierite forms in aluminium-rich regionally metamorphosed rocks, disseminated or in veinlets cutting schist, and in pegmatitic veins. Its type locality is a quarry at Beaunant near Lyon, France. The International Gem Society lists violet gem material from Pershing County, Nevada, material from Arizona, France and Madagascar, facetable bluish-green material from Minas Gerais, Brazil, and transparent reddish-brown stones from Sri Lanka.

Identification

Dumortierite is notably hard for an opaque blue stone (7 to 8) and shows strong pleochroism in blue and violet tones. The International Gem Society notes that Arizona "dumortierite" is actually a quartz-impregnated variety, so blue quartz-rich material sold under this name may be dumortierite quartz rather than the pure mineral. Fibrous inclusions have been noted in transparent Brazilian stones.

Care

Not collected yet

History & culture

History

Dumortierite is named in honour of Eugène Dumortier (1801–1876), a palaeontologist from Lyon, France, who wrote on the Jurassic deposits of the Rhône basin; the mineral's type locality is near Lyon.

Cultural meanings

Not collected yet

Traditional beliefs

Not collected yet

Sources

Collected Oct 23, 2026