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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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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/
Chrome Tourmaline Single
limited time offer, ref# YCH103ao
Chrome Tourmaline Single Oval Slightly included
Size: 8.40 X 5.80 MM
Weight: 1.190 CTS
Shape: Oval
Clarity: Slightly included
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10 % OFF, YOU SAVE 16.10 USD
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USD 144.90
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Today’s Trade/
Best Selling Gems:
Zircon Zircon
227 Zircon ’s available
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Color Change Garnet Color Change Garnet
219 Color Change Garnet ’s available
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Sphalerite Sphalerite
16 Sphalerite ’s available
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Danburite Danburite
321 Danburite ’s available
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Opal Opal
15 Opal ’s available
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Gemstone Variety: Hits Index
Going Up Amber +153217 +1.9%
average price USD 189.30 per item
Going Down Sapphire -5314 -0.2%
average price USD 401.27 per item
Going Down Alexandrite -23 +-0.0%
average price USD 1967.85 per item
Going Up Parisite +1101 +0.1%
average price USD 122.67 per item
Going Up Anatase +633 +0.1%
average price USD 221.50 per item
See more real time gem reports.
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Gem Library /
Gems Legend and  Lore This month birthstone: Ruby
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June 21 – July 22
Cardinal Sign. Relates to water. Your zodiac stone...more

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