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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/
Demantoid Single
From our finest gemstones collection
Demantoid Single Oval Slightly to Moderately included
Size: 7.50 X 6.30 MM
Weight: 2.060 CTS
Shape: Oval
Clarity: Slightly to Moderately included
Usually ships within 24 hours
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USD 1442.00
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Deal of the Day/
Danburite Single
limited time offer, ref# YDN109ai
Danburite Single Cushion Slightly included
Size: 9.00 X 6.20 MM
Weight: 1.810 CTS
Shape: Cushion
Clarity: Slightly included
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USD 46.33
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Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1685 Sapphire ’s available
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Spinel Spinel
460 Spinel ’s available
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Alexandrite Alexandrite
298 Alexandrite ’s available
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Tanzanite Tanzanite
454 Tanzanite ’s available
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Zircon Zircon
237 Zircon ’s available
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Gemstone Variety: Hits Index
Going Down Amber -23220 -0.5%
average price USD 183.13 per item
Going Down Sapphire -430 +-0.0%
average price USD 397.34 per item
Going Up Alexandrite +1880 +0.3%
average price USD 2069.44 per item
Going Down Parisite -1231 -0.2%
average price USD 122.67 per item
Going Down Anatase -2132 -0.3%
average price USD 221.50 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Turquoise
More from the Gem Library about Birthstones.
Sagittarus Sagittarius
November 22 – December 21
Mutable Sign. Goes at a great gallop. Your zodiac stone...more

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