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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 12 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 37.60 and smallest Sillimanite weight is CTS 1.88.

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/
Taaffeite Single
From our finest gemstones collection
Taaffeite Single Cushion Eye clean
Size: 7.20 X 7.00 MM
Weight: 2.230 CTS
Shape: Cushion
Clarity: Eye clean
Usually ships within 24 hours
OUR PRICE
USD 14238.00
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Deal of the Day/
Danburite Single
limited time offer, ref# XDN502ai
Danburite Single Oval Eye clean to Slightly included
Size: 11.70 X 8.40 MM
Weight: 3.440 CTS
Shape: Oval
Clarity: Eye clean to Slightly included
Usually ships within 24 hours
10 % OFF, YOU SAVE 5.85 USD
NOW ONLY
USD 52.63
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Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1473 Sapphire ’s available
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Spinel Spinel
367 Spinel ’s available
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Tanzanite Tanzanite
441 Tanzanite ’s available
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Alexandrite Alexandrite
301 Alexandrite ’s available
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Zircon Zircon
257 Zircon ’s available
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Gemstone Variety: Hits Index
Going Down Amber -14372 -0.6%
average price USD 177.84 per item
Going Down Sapphire -5851 -0.4%
average price USD 348.04 per item
Going Up Alexandrite +499 +0.1%
average price USD 1641.70 per item
Going Down Color Change Garnet -453 -0.3%
average price USD 736.55 per item
Going Down Anatase -8042 -5.2%
average price USD 185.71 per item
See more real time gem reports.
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Gem Library /
Gems Legend and  Lore This month birthstone: Tourmaline
More from the Gem Library about Birthstones.
Libra Libra
September 23 – October 22
Cardinal Sign. Libra is artistic and harmonious. Your zodiac stone...more

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