Andalusite Facts

Andalusite Facts

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Andalusite Properties

Chemical Composition It is aluminum silicate having the chemical formula Al2 SiO5.
Colours Different shades of brown and green. Other colours are red, gray, orange and pink.
Luster Vitreous to glassy.
Hardness Varies between 6.5- 7.5.
Specific Gravity 3.1 to 3.2
Refractive Index 1.632-1.650
Solid State Transparent to translucent.
Crystal System Orthorhombic crystal system.
Pleochroism Very strong.
Fractures Uneven to sub conchoidal.
Enhancement It is sometimes enhance to improve the colour.
Source Brazil, Sri Lanka, UK, Spain, Australia, United States, India, Russia and China.
Precautions Needs only general gemstone precautions, nothing specific.
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