Dumortierite tumbled

A variety of Dumortierite

What is Dumortierite tumbled?

Dumortierite tumbled is dark blue or green with brown or black speckles throughout. Sometimes, a rare pink variety is found. It has been mistaken for Lapis Lazuli and is sometimes used as its imitation. Dumortierite tumbled is found in a number of places including Austria and across Africa and the USA. It is used for ornamental pieces.

Optical Properties

Refractive Index
1.669-1.723
Birefringence
0.011-0.037
Pleochroism
Red-brown crystals - strong trichroism: black, red brown, brown
Optical Character
Biaxial negative

Dumortierite tumbled Market Value Calculator

Estimate the market value of Dumortierite tumbled using size, quality, and finish. This preview calculator is for quick context and is not a formal appraisal.

Preview only. Full pricing comps and valuation report in the app.

Dumortierite tumbled Localities Map

See where Dumortierite tumbled is found with a localities map, collecting zones, and geology context. Generate a sample map preview below.

Map preview
North ZoneCentral RidgeSouth Basin

Interactive map layers and collecting notes are available in the app.

Quick Facts

Physical Properties

Streak
White

Chemical Properties

Chemical Formula
Al(Al2O)(Al2O)2(SiO4)3(BO3)
Elements
Al, B, O, Si
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