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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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Tourmaline Pair Oval Eye clean
Size: 9.20 X 7.60 MM
Weight: 5.060 CTS
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Clarity: Eye clean
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Chrome Tourmaline Single
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Chrome Tourmaline Single Fancy Eye clean
Size: 11.70 X 9.80 MM
Weight: 3.590 CTS
Shape: Fancy
Clarity: Eye clean
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227 Zircon ’s available
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Color Change Garnet Color Change Garnet
219 Color Change Garnet ’s available
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318 Danburite ’s available
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Gemstone Variety: Hits Index
Going Down Amber -1094 +-0.0%
average price USD 189.30 per item
Going Up Sapphire +4073 +0.1%
average price USD 401.22 per item
Going Up Parisite +218 +0.0%
average price USD 122.67 per item
Going Down Alexandrite -3263 -0.4%
average price USD 1966.32 per item
Going Up Anatase +230 +0.0%
average price USD 221.50 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Alexandrite, Pearl
More from the Gem Library about Birthstones.
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June 21 – July 22
Cardinal Sign. Relates to water. Your zodiac stone...more

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