Babingtonite
Mineral Ca2Fe2Si5O14(OH)
About it
Glossy black, sharp crystals often on prehnite or quartz in basalt and traprock; Massachusetts' state mineral, with fine examples from India and China.
- Type
- Mineral
- Group
- Silicate (inosilicate), babingtonite group
- Formula
- Ca2Fe2Si5O14(OH)
- Hardness (Mohs)
- 5.5–6
- Specific gravity
- 3.34–3.37
- Lustre
- vitreous (glassy)
- Crystal system
- Triclinic
- Colours
- black, dark greenish black
- Transparency
- opaque
- Cleavage and fracture
- perfect in one direction
Typical values: real specimens vary. For more, see mindat.org.