Do You Know?

Care

Transparency

Semitranslucent - Opaque

Luster

Vitreous

Pietersite

Locales

Hardness

7
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

SiO2

Composition

silicon dioxide

Colours

Brown
Blue
Red
Yellow