Spinel Facts

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Spinel  Properties 

Chemical Composition

It is Magnesium Aluminum Oxide having the chemical formula MgAl2O4.

Colours

Red, blue, green, orange, mauve, violet, yellow, purple, brown and black.

Streak

White or grayish white.

Refractive Index

1.71 - 1.76 (approx)

Specific Gravity

3.58-3.73

Luster

Vitreous.

Solid State

Transparent to translucent and sometimes nearly opaque.

Crystal System

Isometric – Cubic Hexagonal crystal system.

Hardness

8 Mohs.

Clevage

None

Fractures

Uneven to conchoidal.

Bi-refringence

None

Luminescence

Sometimes fluorescent.

Tenacity

Brittle

Synthetic Availability

Synthetic stones are available.

Enhancement

Not enhanced.

Source

Myanmar (Burma), Afghanistan, Madagascar, Pakistan, Australia, Italy, Sri Lanka (Ceylon), Brazil, Tanzania, Sweden, Turkey, Russia and United States.

Precautions

Only general gemstone precautions required.

 
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