Kornerupine Gemstones by Colour
This table shows the variety of hues this gemstone can be found in. Click on a photo for more information.
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Kornerupine Gemstones by Size
This table shows distribution of Kornerupine gemstone sizes that are listed on this site. This can give a good indication as to the general availability of this gemstone in different sizes.
Contributed photos
Lightest:0.96 cts
Heaviest:12.20 cts
Average:2.88 cts
Total photos:8
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| General Information | |||||||||||||||||||||||
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| Chemical Formula |
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| Physical Properties of Kornerupine | |||||||||||||||||||||||
| Mohs Hardness | 6.5, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Specific Gravity | 3.20 to 3.45, Gemmological Tables (2004) More from other references | ||||||||||||||||||||||
| Cleavage Quality | Good, Gems, Sixth Edition (2006) More from other references | ||||||||||||||||||||||
| Fracture | Conchoidal, Gemstones (2009) | ||||||||||||||||||||||
| Optical Properties of Kornerupine | |||||||||||||||||||||||
| Refractive Index | 1.660 to 1.685, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Optical Character | Biaxial/-, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Birefringence | 0.013 to 0.015, Gemmological Tables (2004) More from other references | ||||||||||||||||||||||
| Pleochroism | Strong trichroism is common for green variety: green - yellow - reddish brown, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Dispersion | 0.018, Gemstones (2009) | ||||||||||||||||||||||
| Chatoyancy | Rare star 4, Blue Chart Gem Identification (2010) | ||||||||||||||||||||||
| Colour | |||||||||||||||||||||||
| Colour (General) | Green, blue-green, brownish-green, greenish-brown, Gemmological Tables (2004) More from other references | ||||||||||||||||||||||
| Causes of Colour | Blue, Cr3+ in octahedral coordination. Green, V3+ in octahedral coordination, Pragmatic Spectroscopy For Gemologists (2011) | ||||||||||||||||||||||
| Transparency | Transparent, Gemmological Tables (2004) More from other references | ||||||||||||||||||||||
| Lustre | Vitreous, Gemstones (2009) | ||||||||||||||||||||||
| Fluorescence & other light emissions | |||||||||||||||||||||||
| Fluorescence (General) | Inert to yellow, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Crystallography of Kornerupine | |||||||||||||||||||||||
| Crystal System | Orthorhombic, Blue Chart Gem Identification (2010) More from other references | ||||||||||||||||||||||
| Habit | Prismatic, Gems, Sixth Edition (2006) More from other references | ||||||||||||||||||||||
| Geological Environment | |||||||||||||||||||||||
| Where found: | Occurs in boron-rich volcanic and sedimentary rocks subjected to metamorphism, Gems, Sixth Edition (2006) | ||||||||||||||||||||||
| Inclusions in Kornerupine | |||||||||||||||||||||||
| Common needle-like inclusions: sharp cat's eye (grayish, greenish, black)- Blue Chart Gem Identification, Herve Nicolas Lazzarelli, 2010, p 4 Needle-like crystals, zircons with tension cracks - Gemmological Tables, Ulrich Henn and Claudio C. Milisenda, 2004, p 19 | |||||||||||||||||||||||
| Further Information | |||||||||||||||||||||||
| Mineral information: | Kornerupine information at mindat.org | ||||||||||||||||||||||
| Significant Gem Localities | |||||||||||||||||||||||
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