Glaucophane
| Colour | Blue, Gray |
|---|---|
| Mohs hardness | 6.0–6.5 |
| Lustre | Vitreous – pearly |
| Streak | Grayish blue |
| Crystal system | Monoclinic |
| Transparency | Translucent |
| Cleavage | Good on [110] and on [001] |
| Fracture | Brittle – conchoidal |
| Chemical formula | ☐Na 2 (Mg 3 Al 2 )Si 8 O 22 (OH) 2 |
| Specific gravity | 3–3.15 |
What is Glaucophane?
Glaucophane is a mineral and a mineral group belonging to the sodic amphibole supergroup of the double chain inosilicates, with the chemical formula Na2(Mg3Al2)Si8O22(OH)2.
How to identify Glaucophane
- Lustre: Vitreous – pearly.
- Hardness: Mohs 6.0–6.5 — about as hard as a steel knife.
- Streak: Grayish blue.
- Habit: Monoclinic crystal system.
Glaucophane in different forms
Stones often confused with Glaucophane
Frequently asked questions
How hard is Glaucophane?
Glaucophane is Mohs 6.0–6.5 on the hardness scale.
What colour is Glaucophane?
Glaucophane is typically blue, gray (Gray, navy blue, lavender-blue).