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Kornerupine

Kornerupine

By Tim Matthews, JD, FGA, GG, DGA,
CEO and President of JTV
Published: June 2014
Modified: November 2021
Kornerupine Polished Kornerupine Jewelry
Table of Contents
  • General Information
  • Kornerupine Colors
  • Kornerupine Spectra
  • Alternate Names
  • Countries of Origin
  • History
  • Care
  • Optical Phenomena

Kornerupine comes in colors ranging from brown to beautiful emerald green to shades of yellow. It has distinctive trichroic pleochroism. Star material has been found in Mogok, Myanmar and is due to tiny rutile and graphite inclusions. Because of its extreme rarity, kornerupine is a highly sought-after collectors stone.

General Information

  • Classification
  • Optical Properties
  • Characteristic Physical Properties
  • Chemistry & Crystallography
Common Name
Kornerupine
Species
Kornerupine
Transparency
Transparent - Translucent
Dispersion
Strength: Moderate Fire Value: 0.019
Refractive Index
1.660-1.684 Tolerance: (+0.003/-0.003)
Birefringence
0.012-0.017
Optic Character
Biaxial
Optic Sign
Negative
Polariscope Reaction
Aggregate (AGG), Doubly Refractive (DR)
Fluorescence
SWUV: Inert to strong yellow
LWUV: Inert to strong yellow
Pleochroism
Trichroic, strong green, yellow, and red-brown
Hardness
6-7
Streak
White
Specific Gravity
3.270-3.350 Typical:3.300
Toughness
Varies
Inclusions
Kornerupine can contain natural inclusions, zircons and needles. Cat's-eye stones will have parallel rutile or graphite fibers.
Luster
Vitreous
Fracture
Conchoidal
Cleavage
Good, in one direction
Chemical Name
magnesium aluminum borosilicate
Chemical Formula
Mg3Al6(Si,Al,B)5O21(OH)
Crystal System
Orthorhombic
Chemistry Classification
Silicate

Kornerupine Colors

  • Green Kornerupine
    Green
  • Yellow Kornerupine
    Yellow
  • Colorless Kornerupine
    Colorless
  • White Kornerupine
    White
  • Blue Kornerupine
    Blue
  • Green Kornerupine
    Green
  • Black Kornerupine
    Black
  • Brown Kornerupine
    Brown
  • Green Kornerupine
    Green

Kornerupine Spectra

Kornerupine Spectra
KORNERUPINE

Color due to iron. A strongly pleochroic gemstone in which the spectrum is best seen in the greenish beta ray by using a polarizing filter as here, a strong broad band is seen centered at 446nm. in the deep blue accompanied by a weaker one in the green centered at 503nm. In the paler yellowish-brown gamma ray this band at 503nm. is usually all that is seen. Absorption of the dark reddish-brown alpha ray is generally too strong to resolve any of these features.

We acknowledge the significant scientific contributions of John S Harris, FGA to the study of gemstone spectra and with deep appreciation to him, acknowledges the use of his images and related notes about gemstones and their spectra in the educational materials on this website.

Alternate Names

Prismatine

Countries of Origin

Tanzania, United Republic Of; Myanmar; Russian Federation; United States of America; Madagascar; Pakistan; Unknown; China; Brazil; Slovakia; France; Colombia; Sri Lanka; Zambia; Kenya; India; Canada; Norway; Finland; South Africa; Uganda; Zimbabwe; Antarctica; Australia; Greenland; Tajikistan

History

Kornerupine was discovered in Greenland and it was named for Danish geologist Andreas N. Kornerup in 1884. The largest stone ever found weighed 16.5cts and was mined in Sri Lanka.

Care

Normal, gentle handling. Avoid ultrasonic cleaners.

Optical Phenomena

Cat's-Eye Kornerupine

Cat’s-Eye Kornerupine can be found in India, Myanmar, and India. The chatoyancy is due to rutile and graphite inclusions. The largest stone reported was over 7 carats.

Cat's-Eye Kornerupine Kornerupine
Cat's-Eye Kornerupine Kornerupine
  • Classification
  • Characteristic Physical properties
Common Name
Cat's-Eye Kornerupine
Specific Gravity
3.27
Toughness
Poor
Inclusions
rutile and graphite inclusions

Star Kornerupine

The first star kornerupine was found in Mogak, Burma in 1884. It has also been reported to have been found in the Taita Hills, Kenya and Sri Lanka. It is extremely rare and displays a 4-ray star.

  • Classification
  • Characteristic Physical properties
Common Name
Star Kornerupine
Specific Gravity
3.27
Toughness
Poor
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