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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/
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# XDN482ae
Danburite Single Cushion Eye clean
Size: 11.20 X 7.30 MM
Weight: 2.870 CTS
Shape: Cushion
Clarity: Eye clean
Usually ships within 24 hours
10 % OFF, YOU SAVE 4.02 USD
NOW ONLY
USD 36.16
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Today’s Trade/
Best Selling Gems:
Demantoid Demantoid
5 Demantoid ’s available
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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
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Grossularite Grossularite
5 Grossularite ’s available
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Gemstone Variety: Hits Index
Going Down Tanzanite -89836 -1.4%
average price USD 470.15 per item
Going Up Sapphire +25205 +9.8%
average price USD 395.57 per item
Going Up Amber +90236 +38.5%
average price USD 197.21 per item
Going Up Alexandrite +4650 +4.2%
average price USD 2485.40 per item
Going Up Spinel +5554 +7.4%
average price USD 451.98 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.
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February 19 – March 20
Mutable Sign. Very sensitive. Your zodiac stone...more

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