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Natural Kyanite

Kyanite is a mineral infrequently cut as a gemstone. It occurs in light to dark blue, green, colorless and brown colors in a transparent form with the blue color being most used in gemstones. Kyanite is of interest because of the extreme variablity in hardness with direction. In one direction, the hardness is 4.5 and in the other it is 7. Very easy cleavage is encountered in one direction with a less perfect cleavage occurring at 74 degrees to the first. The finest gem quality Kyanite may be confused in appearance with spinel or blue sapphires from Burma.


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Kyanite Profile

Color information: Blue, Greenish Blue.
Refractive Index: 1.716 – 1.731
Chemical Composition: AL2SIO5
Hardness: 4.5 – 7.0
Density: 3.56 – 3.68
Crystal Group: Triclinic
Ocurrence: Kenya, Nepal, India, Burma,U.S.A.
Sign of the Zodiac: N/A
Month of the year: N/A
Kyanite

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Finest gems/
Sapphire Single
From our finest gemstones collection
Sapphire Single Octagon Slightly included
Size: 15.60 X 6.00 MM
Weight: 4.650 CTS
Shape: Octagon
Clarity: Slightly included
Usually ships within 24 hours
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USD 8640.00
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Deal of the Day/
Beryl Single
limited time offer, ref# YAQ160ae
Beryl Single Pear Eye clean
Size: 13.20 X 9.50 MM
Weight: 4.020 CTS
Shape: Pear
Clarity: Eye clean
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USD 217.08
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Sapphire Sapphire
1688 Sapphire ’s available
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304 Alexandrite ’s available
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454 Tanzanite ’s available
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238 Zircon ’s available
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Gemstone Variety: Hits Index
Going Up Amber +18392 +0.4%
average price USD 183.13 per item
Going Up Sapphire +2352 +0.1%
average price USD 395.29 per item
Going Down Alexandrite -67 +-0.0%
average price USD 2019.19 per item
Going Up Parisite +2244 +0.3%
average price USD 122.67 per item
Going Up Anatase +26403 +4.0%
average price USD 221.50 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Garnet , Rhodolite
More from the Gem Library about Birthstones.
Aquarius Aquarius
January 21 – February 18
Fixed Sign. Water, water everywhere. Your zodiac stone...more

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