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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 11 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/
Danburite Single
limited time offer, ref# XDN514ag
Danburite Single Pear Eye clean
Size: 13.90 X 9.50 MM
Weight: 4.060 CTS
Shape: Pear
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 6.90 USD
NOW ONLY
USD 62.12
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Today’s Trade/
Best Selling Gems:
Sapphire Sapphire
1620 Sapphire ’s available
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Spinel Spinel
392 Spinel ’s available
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Alexandrite Alexandrite
290 Alexandrite ’s available
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Tanzanite Tanzanite
473 Tanzanite ’s available
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Zircon Zircon
231 Zircon ’s available
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Gemstone Variety: Hits Index
Going Down Amber -5952 -0.2%
average price USD 174.38 per item
Going Up Sapphire +328 +0.0%
average price USD 384.23 per item
Going Up Alexandrite +682 +0.1%
average price USD 1835.93 per item
Going Down Anatase -1331 -0.4%
average price USD 185.71 per item
Going Down Turquoise -1485 -0.5%
average price USD 55.07 per item
See more real time gem reports.
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Gem Library /
Gems Legend and  Lore This month birthstone: Aquamarine
More from the Gem Library about Birthstones.
Aries Aries
March 21 – April 19
Cardinal sign. Born to be a Leader. Your zodiac stone...more

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