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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/
Sphene Single
From our finest gemstones collection
Sphene Single Heart Eye clean
Size: 13.10 X 18.10 MM
Weight: 13.740 CTS
Shape: Heart
Clarity: Eye clean
Usually ships within 24 hours
OUR PRICE
USD 9893.00
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Deal of the Day/
Amber Single
limited time offer, ref# YAR137aa
Amber Single Pear Transparent
Size: 16.52 X 9.96 MM
Weight: 2.310 CTS
Shape: Pear
Clarity: Transparent
Usually ships within 24 hours
10 % OFF, YOU SAVE 16.00 USD
NOW ONLY
USD 144.00
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Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1702 Sapphire ’s available
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Spinel Spinel
454 Spinel ’s available
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Alexandrite Alexandrite
294 Alexandrite ’s available
Browse gems | Learn More
Tanzanite Tanzanite
450 Tanzanite ’s available
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Zircon Zircon
227 Zircon ’s available
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Gemstone Variety: Hits Index
Going Down Amber -15307 -0.2%
average price USD 183.13 per item
Going Down Sapphire -8402 -0.3%
average price USD 403.26 per item
Going Down Parisite -6575 -0.8%
average price USD 122.67 per item
Going Down Anatase -1172 -0.1%
average price USD 221.50 per item
Going Down Alexandrite -2870 -0.3%
average price USD 1956.52 per item
See more real time gem reports.
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Gem Library /
Gems Legend and  Lore This month birthstone: Diamond
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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