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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
From our finest gemstones collection
Tourmaline Pair Oval Eye clean
Size: 9.20 X 7.60 MM
Weight: 5.060 CTS
Shape: Oval
Clarity: Eye clean
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Deal of the Day/
Beryl Single
limited time offer, ref# YAQ160aa
Beryl Single Pear Eye clean
Size: 14.60 X 10.70 MM
Weight: 5.150 CTS
Shape: Pear
Clarity: Eye clean
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USD 278.10
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Today’s Trade/
Best Selling Gems:
Demantoid Demantoid
5 Demantoid ’s available
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Phenakite Phenakite
1 Phenakite ’s available
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Quartz Quartz
1 Quartz ’s available
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Grossularite Grossularite
5 Grossularite ’s available
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Enstatite Enstatite
21 Enstatite ’s available
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Gemstone Variety: Hits Index
Going Down Tanzanite -414193 -1.3%
average price USD 477.26 per item
Going Up Amber +97930 +4.6%
average price USD 200.82 per item
Going Down Sapphire -64942 -4.8%
average price USD 398.71 per item
Going Up Anatase +8643 +0.9%
average price USD 250.62 per item
Going Down Freshwater Pearl -56058 -9.6%
average price USD 70.10 per item
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Gems Legend and  Lore This month birthstone: Alexandrite, Pearl
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Dual nature. You can go in many directions. Your zodiac stone...more

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