Erythrite
| Colour | Pink, Purple, Red |
|---|---|
| Mohs hardness | 1.5–2.5 |
| Lustre | Subadamantine, pearly on cleavages |
| Streak | Pale red to pink |
| Crystal system | Monoclinic |
| Transparency | Transparent to translucent |
| Cleavage | Perfect on ; poor on and {{mset|02}} |
| Chemical formula | Co 3 (AsO 4 ) 2 ·8H 2 O |
| Specific gravity | 3.06 |
What is Erythrite?
Erythrite, also known as red cobalt, previously cobalt ochre is a secondary hydrated cobalt arsenate mineral with the formula Co3(AsO4)2•8H2O. Erythrite and annabergite, chemical formula Ni3(AsO4)2•8H2O, or nickel arsenate form a complete series with the general formula (Co,Ni)3(AsO4)2•8H2O.
How to identify Erythrite
- Lustre: Subadamantine, pearly on cleavages.
- Hardness: Mohs 1.5–2.5 — soft; a knife will scratch it.
- Streak: Pale red to pink.
- Habit: Monoclinic crystal system.
Erythrite in different forms
Stones often confused with Erythrite
Frequently asked questions
How hard is Erythrite?
Erythrite is Mohs 1.5–2.5 on the hardness scale.
What colour is Erythrite?
Erythrite is typically pink, purple, red (Crimson to peach-red, pale rose, or pink, may be zoned).