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Natural Sillimanite

Sillimanite also called FIBROLITE, is brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needlelike crystals frequently found in fibrous aggregates. An aluminum silicate, Al2OSiO4, it occurs in high-temperature regionally metamorphosed clay-rich rocks (e.g., schists and gneisses). Sillimanite is found at many points in France, Madagascar, and the eastern United States; a pale sapphire-blue gem variety occurs in the gravels of Sri Lanka.


  • There are 10 Sillimanite gemstones available at Multicolour.com
  • Sillimanite(s) are organized in the following categories: Single,  gemstones.
  • Our most expensive Sillimanite is USD 215.95 and largest Sillimanite weight is CTS 6.17.
  • Our cheapest Sillimanite is USD 50.20 and smallest Sillimanite weight is CTS 2.51.

Sillimanite Profile

Color information: violet blue, grey green, colorless, brown, green,
Refractive Index: 1.658 - 1.678
Chemical Composition: Al2OSiO4
Hardness: 6 - 7.5
Density: 3.25
Crystal Group: Orthorhombic
Ocurrence: France, Madagascar, U.S.A., Sri Lanka, Burma. Kenya
Sign of the Zodiac: N/A
Month of the year: N/A
Sillimanite

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Finest gems/
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
Usually ships within 24 hours
OUR PRICE
USD 3758.40
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Deal of the Day/
Danburite Single
limited time offer, ref# XDN482ab
Danburite Single Cushion Eye clean to Slightly included
Size: 10.40 X 7.70 MM
Weight: 2.820 CTS
Shape: Cushion
Clarity: Eye clean to Slightly included
Usually ships within 24 hours
10 % OFF, YOU SAVE 3.95 USD
NOW ONLY
USD 35.53
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Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1688 Sapphire ’s available
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Spinel Spinel
460 Spinel ’s available
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Alexandrite Alexandrite
304 Alexandrite ’s available
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Tanzanite Tanzanite
454 Tanzanite ’s available
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Zircon Zircon
238 Zircon ’s available
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Gemstone Variety: Hits Index
Going Up Amber +18420 +0.4%
average price USD 183.13 per item
Going Up Sapphire +2367 +0.1%
average price USD 395.29 per item
Going Down Alexandrite -64 +-0.0%
average price USD 2019.19 per item
Going Up Parisite +2246 +0.3%
average price USD 122.67 per item
Going Up Anatase +26407 +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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