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Iolite

Oval cut iolite
(i-o-lit')

19th c.; gr. ios-lithos

A silicate of alumina, iron, and magnesia, with a bright blue color. It is remarkable for its dichroism, and is also called dichroite
Color
Transparent blue to violetish blue
Family
Aluminum and magnesium silicate
Chemical composition
Mg2Al4Si5O18
Crystal system
Orthorhombic
Hardness (Mohs scale)
7 - 7,5
Specific gravity
2,61±0,05
Refractive index
1,542 - 1,551 +0,005 -0,012
Birefringence
0,00 to 0,009
Optical character
Biaxial -
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