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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/
Turquoise Single
limited time offer, ref# XTQ107aq
Turquoise Single Fancy Opaque
Size: 48.71 X 23.24 MM
Weight: 45.490 CTS
Shape: Fancy
Clarity: Opaque
Usually ships within 24 hours
10 % OFF, YOU SAVE 9.10 USD
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USD 81.88
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Today’s Trade/
Best Selling Gems:
Color Change Garnet Color Change Garnet
221 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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Mali Garnet Mali Garnet
48 Mali Garnet ’s available
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Gemstone Variety: Hits Index
Going Down Amber -60950 -0.7%
average price USD 197.21 per item
Going Up Sapphire +636 +0.0%
average price USD 400.49 per item
Going Up Alexandrite +16 +0.0%
average price USD 1880.12 per item
Going Down Parisite -181 +-0.0%
average price USD 122.67 per item
Going Down Anatase -89 +-0.0%
average price USD 221.50 per item
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Gem Library /
Gems Legend and  Lore This month birthstone: Peridot
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July 23 – August 22
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