Dumortierite

Dumortieriet, Dumortierit, Dumortierita, Dumortieryt, Дюмортьерит, 藍綫石


Commonly known      rarer (so called collectors stones)      very rare (rarities)      relatively rare organic material


Formula: Al7[O3/BO3/(SiO4)3]
Mineral class: silicates
Crystal system: rhombic
Mohs scale: 7
Density (g/cm3): 3.26 - 3.41
Refractive index: 1.678 - 1.723
Cleavage: distinct - poor
Colors: greenish, blue, violet, brownish
Luster: vitreous - dull
Fluorescence: slight
Pleochroism: strong: black - brown
Largest Dumortierite: 6 cm?
Deposits: Brazil, Canada, France, Madagascar, Myanmar, Namibia, Poland, Sri Lanka, USA
1st Description: 1892
Name: in honor of the French paleontologist Eugène Dumortier (19th Century)

Dumortierite

Weight: 0.21 ct

Origin: Madagascar

Photo by kind permission of © www.irocks.com

Dumortierite

Weight: 0.15 ct

Origin: Madagascar

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Dumortierite Mineral

Size: 0.6 x 0.5 x 0.2 cm

Origin: Vaca Morta Quarry / Boquira / Serra da Vereda / Bahia / Brazil

Photo by kind permission of © www.lucianabarbosa.com

Dumortierite

Weight: 0.20 ct
Size: 0.4 x 0.3 x 0.2 cm
Origin: Vaca Morta Quarry / Boquira / Serra da Vereda / Bahia / Brazil

Photo by kind permission of © www.lucianabarbosa.com

Dumortierite

Size: 0.6 x 0.51 cm
Weight: 0.40 ct
Origin: Brazil

Photo by kind permission of © www.thegemtrader.com

Dumortierite

Weight: 0.18 ct

Origin: Bahia / Brazil

Photo by kind permission of © http://lucianabarbosa.com

Dumortierite

Origin: Madagascar

Photo by kind permission of © www.cs.cmu.edu/~adg/adg-piimages.html

Dumortierite Mineral

Origin: Madagascar

Photo by kind permission of © www.mineraltivadar.hu
Dumortierite Mineral
Dumortierite

Size: 1.21 cm
Weight: 7.87 ct
Origin: Ambositra Distr. / Fianarantsoa Prov. / Madagascar

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Dumortierite

Size: 0.5 x 0.4 x 0.2 cm
Weight: 0.35 ct
Origin: Vaca Morta Quarry / Boquira / Serra da Vereda / Bahia / Brazil

Photo by kind permission of © www.lucianabarbosa.com

Dumortierite

Weight: 0.29 ct

Origin: Madagascar

Photo by kind permission of © www.irocks.com

Dumortierite

Size: 0.26 cm
Weight: 0.08 ct
Origin: Madagascar

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Dumortierite

Size: 0.5 x 0.2 x 0.1 cm
Weight: 0.17 ct
Origin: Vaca Morta Quarry / Boquira / Serra da Vereda / Bahia / Brazil

Photo by kind permission of © http://lucianabarbosa.com

Dumortierite Mineral

Weight: 0.39 ct

Origin: Ohngaing / Mogok / Myanmar

Photo by kind permission of © www.crystal-treasure.com
Dumortierite Mineral
Dumortierite

Weight: 2.55 ct

Origin: Africa

Foto mit freundlicher Erlaubnis von © www.multicolour.com

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