Andradite
greenyellowblack · Garnet family
| Also known as | Garnet (Garnet family) |
|---|---|
| Colour | Green, Yellow, Black |
| Mohs hardness | 6.5 to 7 |
| Lustre | Adamantine to resinous, dull |
| Streak | White |
| Crystal system | Cubic |
| Transparency | Transparent to translucent |
| Cleavage | none |
| Fracture | conchoidal to uneven |
| Chemical formula | Ca 3 Fe 2 (SiO 4 ) 3 |
| Specific gravity | 3.859 calculated; 3.8–3.9 measured |
What is Andradite?
Andradite is a mineral species of the garnet group. It is a nesosilicate, with chemical formula Ca3Fe2Si3O12.
How to identify Andradite
- Lustre: Adamantine to resinous, dull.
- Hardness: Mohs 6.5 to 7 — about as hard as a steel knife.
- Streak: White.
- Habit: Cubic crystal system.
Andradite in different forms
Stones often confused with Andradite
Frequently asked questions
How hard is Andradite?
Andradite is Mohs 6.5 to 7 on the hardness scale.
What colour is Andradite?
Andradite is typically green, yellow, black (Yellow, greenish yellow to emerald-green, dark green; brown, brownish red, brownish yellow; grayish black, black; may be).