Menu
Do You Know?
Care
Transparency
Semitransparent - Translucent
Luster
Vitreous, Greasy
Blue Chalcedony
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
Gallery →
Chemical Formula
SiO2
Composition
silicon dioxide
Colours
Light Blue
