Do You Know?

Care

Transparency

Opaque

Luster

Vitreous, Resinous

Boulder Opal

Locales

Australia

Hardness

5.5-6.5
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

hydrated silicon dioxide

Colours

Multicolour