Do You Know?

Care

Transparency

Transparent - Opaque

Luster

Vitreous

Spinel

Locales

Hardness

8
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10

Treatment

Interesting Fact

Chemical Formula

Composition

magnesium aluminum oxide

Colours

Red
Orange
Yellow
Green
Blue
Purple
Brown
Black