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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/
Tsavorite Single
From our finest gemstones collection
Tsavorite Single Octagon Slightly included
Size: 10.10 X 7.80 MM
Weight: 4.770 CTS
Shape: Octagon
Clarity: Slightly included
Usually ships within 24 hours
OUR PRICE
USD 15264.00
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Deal of the Day/
Danburite Single
limited time offer, ref# XDN502aj
Danburite Single Oval Eye clean
Size: 11.60 X 8.20 MM
Weight: 3.240 CTS
Shape: Oval
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 5.51 USD
NOW ONLY
USD 49.57
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Today’s Trade/
Best Selling Gems:
Alexandrite Alexandrite
303 Alexandrite ’s available
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Tanzanite Tanzanite
449 Tanzanite ’s available
Browse gems | Learn More
Zircon Zircon
227 Zircon ’s available
Browse gems | Learn More
Ruby Ruby
171 Ruby ’s available
Browse gems | Learn More
Tsavorite Tsavorite
537 Tsavorite ’s available
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Gemstone Variety: Hits Index
Going Down Amber -7717 -0.1%
average price USD 183.13 per item
Going Down Sapphire -13801 -0.4%
average price USD 403.73 per item
Going Up Parisite +3566 +0.4%
average price USD 122.67 per item
Going Down Anatase -886 -0.1%
average price USD 221.50 per item
Going Down Alexandrite -6499 -0.8%
average price USD 1919.60 per item
See more real time gem reports.
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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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