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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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Demantoid Single
From our finest gemstones collection
Demantoid Single Shield Slightly included
Size: 9.61 X 7.67 MM
Weight: 2.600 CTS
Shape: Shield
Clarity: Slightly included
Usually ships within 24 hours
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Beryl Single
limited time offer, ref# YBE021ab
Beryl Single Oval Slightly included
Size: 11.10 X 7.80 MM
Weight: 2.500 CTS
Shape: Oval
Clarity: Slightly included
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Today’s Trade/
Best Selling Gems:
Tanzanite Tanzanite
449 Tanzanite ’s available
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Zircon Zircon
227 Zircon ’s available
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Ruby Ruby
171 Ruby ’s available
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Tsavorite Tsavorite
537 Tsavorite ’s available
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Tourmaline Tourmaline
449 Tourmaline ’s available
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Gemstone Variety: Hits Index
Going Down Amber -9752 -0.1%
average price USD 183.13 per item
Going Down Sapphire -14887 -0.5%
average price USD 403.73 per item
Going Up Parisite +3972 +0.5%
average price USD 122.67 per item
Going Down Anatase -1085 -0.1%
average price USD 221.50 per item
Going Down Alexandrite -5961 -0.7%
average price USD 1909.64 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Emerald
More from the Gem Library about Birthstones.
Taurus Taurus
April 20 – May 20
Mutable Sign. Very earthy and quiet. Your zodiac stone...more

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