Ludwigite
Mineral Mg2Fe(BO3)O2
About it
Dark green to black fibrous and needle-like masses with a silky to submetallic shine, in magnesian skarns. Named for Austrian chemist Ernst Ludwig; first found in the Banat region of Romania.
- Type
- Mineral
- Group
- Borate, ludwigite group
- Formula
- Mg2Fe(BO3)O2
- Hardness (Mohs)
- 5–6
- Specific gravity
- 3.6–4.2
- Streak
- greenish black to black
- Lustre
- silky, submetallic
- Crystal system
- Orthorhombic
- Colours
- dark green, black
- Transparency
- opaque
Typical values: real specimens vary. For more, see mindat.org.