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Home / Gem Library / Gemstones Varieties / Sillimanite November 24, 2017

Natural Sillimanite

Sillimanite, also called FIBROLITE, is a brown, pale green, or white glassy silicate mineral that often occurs in long, slender, needle like crystals frequently found in fibrous aggregates. An aluminum silicate, (Al2SiO5), it occurs in high-temperature regionally metamorphosed or sedimentary clay-rich rocks (e.g., schists and gneisses). Sillimanite is found at many points in France, Madagascar, and the eastern United States and also occurs in pale sapphire-blue colors in the gravels of Sri Lanka.


  • There are 2 Sillimanite gemstones available at Multicolour.com
  • Sillimanite(s) are organized in the following categories: Single,  gemstones.

Find your Sillimanite

Our Sillimanite(s) are available in various shapes, sizes and colors. 2 Sillimanite(s), too many to look through? You may select any combination of search options. Colors grade into each other and you can search for more than one color at once. For a better selection, try selecting two or three colors, -- your first choice plus the two closest colors.

Color range
yellow-green or green-yellow
green





Sillimanite Profile

Color information: violet blue, grey green, colorless, brown, green,
Refractive Index: 1.658 - 1.678
Chemical Composition: Al2SiO5
Hardness: 6 - 7.5
Density: 3.25
Crystal Group: Orthorhombic
Ocurrence: France, Madagascar, U.S.A., Sri Lanka, Burma. Kenya, Myanmar.
Sign of the Zodiac: N/A
Month of the year: N/A
Sillimanite
Sillimanite is named after the American chemist Benjamin Silliman. It was first described in 1824 as an occurrence in Chester, Connecticut, USA. A common variety of sillimanite is known as fibrolite that was so named because the mineral appears like a bunch of fibres twisted together when viewed in thin section or even by the naked eye. The hardness for the crystalline version of the mineral is 7.5 while the fibrous variety may vary between 6 and 7.

Sillimanite crystallizes in the orthorhombic system and is polymorphous with both kyanite and andalusite. All three stones share the same chemical composition but vary in crystal formation.

Natural sillimanite is the best raw material for the manufacture of high alumina refractories but its use on a large scale is not possible due to the high cost and required purification. With the advent of online selling Sillimanite has become more popular with collectors while also enjoying a resurgence among metaphysical philosophers and healers.

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Sillimanite range/
Sillimanite Single
Sillimanite Single Oval Eye clean
Size: 15.70 X 14.30 MM
Weight: 15.860 CTS
Shape: Oval
Clarity: Eye clean
Usually ships within 24 hours
RECOMMENDED
OUR PRICE
USD 237.90
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Sillimanite Single
Sillimanite Single Oval Eye clean
Size: 11.30 X 9.20 MM
Weight: 3.720 CTS
Shape: Oval
Clarity: Eye clean
Usually ships within 24 hours
RECOMMENDED
OUR PRICE
USD 186.00
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