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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 5 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 101.85 and smallest Sillimanite weight is CTS 2.91.

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/
Sapphire Single
From our finest gemstones collection
Sapphire Single Heart Eye clean to Slightly included
Size: 9.80 X 8.00 MM
Weight: 4.180 CTS
Shape: Heart
Clarity: Eye clean to Slightly included
Usually ships within 24 hours
OUR PRICE
USD 15048.00
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Deal of the Day/
Beryl Single
limited time offer, ref# YAQ160aa
Beryl Single Pear Eye clean
Size: 14.60 X 10.70 MM
Weight: 5.150 CTS
Shape: Pear
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 30.90 USD
NOW ONLY
USD 278.10
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Today’s Trade/
Best Selling Gems:
Demantoid Demantoid
5 Demantoid ’s available
Browse gems | Learn More
Phenakite Phenakite
1 Phenakite ’s available
Browse gems | Learn More
Quartz Quartz
1 Quartz ’s available
Browse gems | Learn More
Scapolite Scapolite
23 Scapolite ’s available
Browse gems | Learn More
Grossularite Grossularite
5 Grossularite ’s available
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Gemstone Variety: Hits Index
Going Down Tanzanite -280542 -1.5%
average price USD 473.98 per item
Going Down Sapphire -1799 -0.5%
average price USD 400.67 per item
Going Up Amber +1676 +0.5%
average price USD 197.21 per item
Going Up Anatase +17140 +7.0%
average price USD 250.62 per item
Going Up Alexandrite +131 +0.1%
average price USD 2486.80 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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