Cordierite (Iolite, Dichroite)

Cordieriet, Cordierit, Cordiérite, Kordieriitti, Kordieryt, Кордієрит, קורדיאריט, 菫青石, کوردیریت


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


Formula: Mg2Al3[AlSi5O18]
Mineral class: silicates
Crystal system: rhombic
Mohs scale: 7 - 7.5
Density (g/cm3): 2.55 - 2.75
Refractive index: 1.522 - 1.578
Cleavage: fair - poor
Colors: colorless, yellow, brown, blue, violet
Luster: vitreous
Fluorescence: -
Pleochroism: strong: yellow - blue
Largest Cordierite: 50 cm (La Fuenfria / Robledo de Chavala / Sierra da Guadarrama / Kastilia / Spain)
Deposits: Brazil, Sri Lanka, Myanmar, India, Madagascar, Spain
Discovery: 1813
1st Description: 1892
Name: in honor of the French mineralogist Pierre Louis Cordier (1777 - 1861)

Cordierite

Weight: 2.79 ct

Origin: Embilipitiya / Sri Lanka

Photo by kind permission of © www.thegemtrader.com

Cordierite Mineral

Size: 5 cm

Origin: Richmond Soapstone Quarry / Richmond / Cheshire County / New Hampshire / USA

Photo by kind permission of © www.irocks.com
Cordierite Mineral
Cordierite

Weight: 0.14 ct

Origin: Madagascar

Photo by kind permission of © www.thegemtrader.com

Cordierite Mineral

Size: Micromount

Origin: Ettringer Bellerberg Mt. / Ettringen / Eifel Mts./ Rhineland-Palatinate / Germany

Photo by kind permission of © Stephan Wolfsried
Cordierite
Cordierite

Weight: 1.68 ct
Size: 0.8 cm
Origin: Madagascar

Photo by kind permission of © www.kox-gems.com

Cordierite Pleochroism

Size: 1.1 x 0.9 x 0.8 cm

Origin: Madagascar

Photo by kind permission of © www.lucianabarbosa.com
Cordierite Pleochroism

Cordierite

Weight: 0.41 ct

Origin: Tanzania

Photo by kind permission of © www.irocks.com

Cordierite

Weight: 3.97 ct
Size: 1.2 x 1.0 cm
Origin: India

Photo by kind permission of © www.kox-gems.com

Cordierite

Weight: 13.45 ct

Origin: India

Photo by kind permission of © www.thegemtrader.com
Cordierite Ring

Photo by kind permission of © www.skywalker.cochise.edu

Cordierite Mineral

Size: 1.8 x 0.8 x 0.6 cm

Origin: Coroaci / Minas Gerais / Brazil

Photo by kind permission of © www.lucianabarbosa.com
Cordierite Mineral
Cordierite

Weight: 0.89 ct

Origin: Mogok / Mandalay Div. / Myanmar

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

Cordierite

Weight: 0.84 ct

Origin: Brazil

Photo by kind permission of © www.irocks.com

Cordierite Mineral

Size: Micromount

Origin: Nickenicher Sattel / Laacher See area / Eifel Mts. / Rhineland-Palatinate / Germany

Photo by kind permission of © Stephan Wolfsried
Anatase
Cordierite

Photo by kind permission of © www.skywalker.cochise.edu

Cordierite

Weight: 9.95 ct

Photo by kind permission of © www.multicolour.com

Cordierite Mineral

Size: Micromount

Origin: Laacher See area / Eifel Mts. / Rhineland-Palatinate / Germany

Photo by kind permission of © Stephan Wolfsried
Anatase

Cordierite Cat's Eye

Weight: 2.35 ct

Origin: India

Photo by kind permission of © www.thegemtrader.com
Cordierite Cat's Eye

Weight: 2.43 ct

Origin: India

Photo by kind permission of © www.edelsteine.at
Cordierite Cat's Eye

Size: 1.03 x 0.80 x 0.60 cm
Weight: 3.61 ct
Origin: India

Photo by kind permission of © www.djraregems.com
Cordierite Cat's Eye

Size: 1.14 x 1.07 cm
Weight: 6.24 ct
Origin: India

Photo by kind permission of © www.minclassics.com
Cordierite Cat's Eye

Weight: 8.41 ct

Origin: Sri Lanka

Photo by kind permission of © www.online-edelstein.de
Cordierite Cat's Eye

Weight: 48.20 ct

Origin: Sri Lanka

Photo by kind permission of © www.online-edelstein.de
Cordierite Cat's Eye

Size: 1.23 x 0.91 cm
Weight: 5.29 ct
Origin: India

Photo by kind permission of © www.minclassics.com

Cordierite Trapiche Mineral "Sakura Ichi" ("Cherry Blossom Stone")

Size: 0.4 cm

Origin: Kameoka / Kyoto Pref. / Japan

Photo by kind permission of © www.rocklogic.biz
Cordierite Mineral
Cordierite Trapiche Mineral "Sakura Ichi" ("Cherry Blossom Stone")

Size: 0.7 cm
Origin: Kameoka / Kyoto Pref. / Japan

Photo: Andre Mongeon, by kind permission of
© Stephanie Martin and Kitchener-Waterloo Gem and Mineral Club
Cordierite Mineral
Cordierite Trapiche Mineral "Sakura Ichi" ("Cherry Blossom Stone")

Size: 0.6 - 0,8 cm
Origin: Kameoka / Kyoto Pref. / Japan

Photo: Andre Mongeon, by kind permission of
© Stephanie Martin and Kitchener-Waterloo Gem and Mineral Club
Cordierite Mineral


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