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Home » Minerals » Sillimanite

Sillimanite


Mineral Properties and Uses



Physical Properties of Sillimanite

Chemical Classification silicate
Color colorless, white, yellow, brown, blue, green
Streak colorless
Luster vitreous
Diaphaneity transparent to translucent
Cleavage perfect
Mohs Hardness 6.5 to 7.5
Specific Gravity 3.2 to 3.3
Diagnostic Properties slender crystals, fibrous habit
Chemical Composition Al2SiO5
Crystal System orthorhombic
Uses no significant commercial use


Sillimanite with magnetite
Sillimanite with magnetite from Benson Mines, New York. Specimen is approximately 4 inches (10 centimeters) across.


Sillimanite
Sillimanite from Williamstown, South Australia. Specimen is approximately 4 inches (10 centimeters) across.



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Sillimanite
Sillimanite with magnetite from Benson Mines, New York. Specimen is approximately 4 inches (10 centimeters) across.




Sillimanite
Sillimanite from Dillon, Montana. Specimen is approximately 4 inches (10 centimeters) across.


Mineral Information
 Andalusite
 Anhydrite
 Apatite
 Arsenopyrite
 Augite
 Azurite

 Barite
 Bauxite
 Beryl
 Biotite
 Bornite

 Calcite
 Cassiterite
 Chalcocite
 Chalcopyrite
 Chlorite
 Chromite
 Chrysoberyl
 Cinnabar
 Clinozoisite
 Copper
 Cordierite
 Corundum
 Cuprite
 Diamond
 Diopside
 Dolomite

 Enstatite
 Epidote

 Fluorite

 Galena
 Garnet
 Glauconite
 Gold
 Graphite
 Gypsum

 Halite
 Hematite
 Hornblende

 Ilmenite

 Jadeite

 Kyanite
 Limonite

 Magnesite
 Magnetite
 Malachite
 Marcasite
 Molybdenite
 Monazite
 Muscovite

 Nepheline
 Nephrite

 Olivine
 Orthoclase

 Plagioclase
 Prehnite
 Pyrite
 Pyrophyllite
 Pyrrhotite

 Quartz

 Rhodochrosite
 Rhodonite
 Rutile
 Scapolite
 Serpentine
 Siderite
 Sillimanite
 Silver
 Sodalite
 Sphalerite
 Spinel
 Spodumene
 Staurolite
 Sulfur
 Sylvite

 Talc
 Titanite
 Topaz
 Tourmaline
 Turquoise

 Uraninite

 Witherite
 Wollastonite

 Zircon
 Zoisite


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