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 Iolite Facts
 Author: , 11/29/2004 7:37:30 PM
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Iolite Properties 

Chemical Composition

It is Magnesium Aluminum Silicate and the chemical formula is Mg2Al4Si5O18.

Colours

Violet blue, violet, yellowish gray, blue and bluish violet

Specific Gravity

2.53 - 2.78

Refractive Index

1.52 - 1.57

Luster

Viterous.

Hardness

7 - 7.5 Mohs

Solid State

Transparent.

Pleochroism

Very high.

Fractures

Uneven / conchoidal / brittle

Bi-refringence

0.001

Crystal System

Orthorhombic crystal system.

Cleavage

Distinct in 3 directions.

Heat Sensitive

No

Dispersion

Medium 0.017

Precautions

Protect from sharp blows, direct sunlight, excessive heat, large temperature change. Avoid home ultrasonic cleaner.

Enhancement

None

Source

Sri Lanka, India, Madagascar, Burma, Zaire, Mozambique, Zimbabwe, Germany, Finland, Brazil, Canada, USA and Tanzania

 



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JewelInfo4u - Iolite Facts