Formula: Mg₂Al₃[AlSi₅O₁₈]
Mineral class: silicates
Crystal system: rhombic
Mohs scale: 7 - 7.5
Density (g/cm³): 2.58 - 2.66
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

Cordierite

Weight: 2.79 ct

Origin: Embilipitiya / Sri Lanka

Photo by kind permission of © www.thegemtrader.com, Brad Payne.

Cordierite Mineral

Size: 5 cm

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

Photo by kind permission of © www.irocks.com, Dr. Robert Lavinsky.

Cordierite

Weight: 0.14 ct

Origin: Madagascar

Photo by kind permission of © www.thegemtrader.com, Brad Payne.

Cordierite Mineral

Size: Micromount

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

Photo by kind permission of © Stephan Wolfsried.

Cordierite

Weight: 0.41 ct

Origin: Tanzania

Photo by kind permission of © www.irocks.com, Dr. Robert Lavinsky.

Cordierite

Weight: 0.4 ct

Origin: Tanzania

Photo by kind permission of © www.irocks.com, Dr. Robert Lavinsky.

Cordierite

Weight: 13.45 ct

Origin: India

Photo by kind permission of © www.thegemtrader.com, Brad Payne.

Cordierite Ring

Photo by kind permission of © www.skywalker.cochise.edu, Roger Weller.

Cordierite

Weight: 0.89 ct

Origin: Mogok / Mandalay Div. / Myanmar

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

Cordierite

Weight: 0.84 ct

Origin: Brazil

Photo by kind permission of © www.irocks.com, Dr. Robert Lavinsky.

Cordierite Mineral

Size: Micromount

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

Photo by kind permission of © Stephan Wolfsried.

Cordierite

Photo by kind permission of © www.skywalker.cochise.edu, Roger Weller.

Cordierite

Weight: 9.95 ct

Photo by kind permission of © www.multicolour.com, David Weinberg.

Cordierite Mineral

Size: Micromount

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

Photo by kind permission of © Stephan Wolfsried.

Cordierite Cat's Eye

Weight: 2.35 ct

Origin: India

Photo by kind permission of © www.thegemtrader.com, Brad Payne.

Cordierite Cat's Eye

Weight: 2.43 ct

Origin: India

Photo by kind permission of © www.edelsteine.at, Wiener Edelsteinzentrum.

Cordierite Cat's Eye

Weight: 8.41 ct

Origin: Sri Lanka

Photo by kind permission of © www.online-edelstein.de, Timo Klopp.

Cordierite Cat's Eye

Weight: 48.20 ct

Origin: Sri Lanka

Photo by kind permission of © www.online-edelstein.de, Timo Klopp.